GRADE 12 MODEL QUESTION PAPER 2020-21

ii How many stages are there in HIV infection? a) One b) Two c) Three d) Four iii In which country AIDS was first clinically observed? a) India b) The United States c) Norway d) Pakistan iv ​Which of the following enzyme required for viral replication plays a critical role in the pathogenesis of HIV infection? a) RNA polymerase b) DNA polymerase c) RNA polymerase II d) Reverse transcriptase 16 Read the following and answer the four questions from 16(i) to 16(iv) given  4 below:  Our immune system is essential for our survival. Without an immune system,  our bodies would be open to attack from bacteria, viruses, parasites, and more.  It is our immune system that keeps us healthy as we drift through a sea of  pathogens.This vast network of cells and tissues is constantly on the lookout  for invaders, and once an enemy is spotted, a complex attack is mounted. The  immune system is spread throughout the body and involves many types of  cells, organs, proteins, and tissues. Crucially, it can distinguish our tissue from  foreign tissue — self from non-self. Dead and faulty cells are also recognized  and cleared away by the immune system.If the immune system encounters a  pathogen, for instance, a bacterium, virus, or parasite, it mounts a so-called  immune response. 

i What is the response during the first attack ? a. More antibodies are produced . b. Less antibody is produced. c. No antibodies are produced. d. None of the above ii What is the response during the second attack ? a. More antibodies are produced . b. Less antibody is produced. c. No antibodies are produced. d. None of the above iii Allergic response needs a mediator and will look after that job.Who am i ? a. IgA b. IgM c. IgE d. Ig D iv A patient is bitten by a dog with confirmed rabies infection. After treating the bite wound, the physician injects the patient with antibodies that are specific for the rabies virus to prevent the development of an active infection. This is an example of: a. Artificial active immunity b. Natural passive immunity c. Artificial passive immunity d. Natural active immunity

SECTION B 17 Sex of the baby is determined by the father, not by the mother. Substantiate 2 18 Polypeptide chains of two haemoglobin molecules are shown below. One of 2 the chains shows an abnormality. Observe the diagram and answer the following questions a) Which of the polypeptide chains in haemoglobin is abnormal leading to a disease? b) What is the reason for this abnormality? 19 Read the statements below and identify the mode of interaction between the 2 species. a.Human liver fluke feed on snail b. Lice on humans c. Orchid attached to a tree d.Mycorrhizal association of fungi and roots of higher plants. 20 a) Name the technique used for the separation of DNA fragments . 2 b) How is the separated DNA visualized? ​ OR Denaturation, Annealing and Extension are three steps of a process used for gene amplification a) Name the process. b) Name the organism from which the DNA polymerase for this process is extracted. 21 There are many features required to facilitate successful cloning into a vector. 2 Write shortly any two such features required by a vector. 22 While studying nucleotide sequence. Raj found the following sequence which 2 can be recognized by some enzymes 5′- GAATTC – 3′ 3′- CTTAAG – 5′ a) Give salient features of this sequence. b) Write the name of enzymes which recognize such sequences​. 23 ​Homeostasis is accomplished by artificial means. Explain any two ways by 2 which other living organisms cope with the situation.

24 ​The “Evil Quartet” is the nickname used to describe the causes of 2 2 biodiversity losses. Explain the reason leading to accelerated rates of extinction of flora and fauna. ​ OR Philosophically or spiritually, we need to realize that every plant or animal species has an intrinsic value and we have a moral duty to protect them. Write down the protective measures. 25 Explain any two levels of biodiversity. SECTION C 26 The graph shown below shows the levels of LH and FSH at various stages of 3 menstrual cycle a) Name the source of LH and FSH. b) The level of LH is maximum during the middle day of the cycle. Mention its effect. c) Note the function of LH in males. 27 The first child of a couple is affected with phenylketonuria. During the second 3 pregnancy they visited a genetic counsellor and he prepared a pedigree chart of their family .a) What is pedigree analysis? b) Draw the symbols for i) Affected female. ii) Sex unspecified. 28 Define flocs. 3 Name two groups of organisms which constitute ‘flocs’. Write their influence on the level of BOD during biological treatment of sewage. 29 A farmer noticed reduction in tobacco yield due to root damage by 3 nematodes, a) What is your suggestion to prevent this infestation? b) Explain the process.

30 3 Given above is the bar diagram showing age structure of three different 5 populations. Observe the diagram carefully and answer the following 5 questions. 5 a) Select the stable population. b) Compare the nature of population growth in A and C SECTION D 31 Write down the difference between Oogenesis and spermatogenesis. 32 Explain Lac operon Model 33 a.What is sewage? b.In which way can sewage be harmful to us. c.What is the key difference between primary and secondary treatment?

Time -3 hours Model question paper 2020-21 Maximum scores- 70 Biology ​ Answer key ​ SECTION A Marks 1 Syngamy 1 2 Parthenogenesis 1 3 Sporopollenin 1 4 Placenta 1 5 Multiple allelism 1 6. Crossing of F​1 ​hybrid with its recessive parent. 1 7 The 2-OH group present at the nucleotide in RNA is a reactive group  1 and makes RNA labile and easily degradable.  8 cry I Ac ,cry II Ab 1 9 Agrobacterium tumifaciens 10 Mammals from colder climates generally have shorter ears and 1 limbs to minimise heat loss. 11 a .Both Assertion and Reason are true and Reason is the correct 1 explanation of Assertion. 12 c. Assertion is true but Reason is false. 1

13 d . Assertion is false but Reason is true. 1 1 14 c. Assertion is true but Reason is false. 4 15 4 i b.T-helper cells  ii c.three iii b) The United States iv d) Reverse transcriptase 16 i b.Less antibody is produced. ii a.More antibodies are produced . iii IgE iv d.Natural active immunity SECTION B 17 ● ovum fertilised with a sperm carrying X- chromosome the zygote 2 develops into a female (XX) . ● The fertilisation of ovum with a Y-chromosome carrying sperm results into a male offspring. 18 a) A 2 b) Substitution of glutamic acid by valine in the 6th position of polypeptide chain. 19 a.predation or parasitism ½ x4=2 b. parasitism c. commensalism d.mutualism

20 a) Gel electrophoresis 2 b) Ethidium bromide stain OR a) Polymerase Chain Reaction (PCR) b) Thermus aquaticus 21 ● Origin of replication (ori): replication starts 2 ● Selectable marker: helps to identify transformants and non transformants. ● Cloning sites (any two) 22 a) Palindromic sequence 2 b) Restriction endonuclease enzyme 23 Hibernation – winter sleeping 2 Aestivation – Summer sleeping Migration – Moving into more suitable area Diapause – inactive in adverse condition ( any two) 24 1)Habitat loss and fragmentation 2 2) Over-exploitation 3) Alien species invasions 4) Co-extinction (any two) OR In Situ conservation – Biosphere reserve, National park, WildLife Sanctuary etc. Ex Situ conservation – Zoo, Botanical gardens, seed bank etc. 25 1. Genetic diversity – A single species might show high diversity at the 2 genetic level over its distributional range 2. Species diversity – Diversity at species level 3. Ecological diversity – Diversity at ecosystem level SECTION -D 3 3 26 a) Pituitary gland b) Helps for ovulation c) Stimulates the synthesis of hormones (androgens) 27 a) It is the study of inheritance of a trait for several generations of a family. b) , 3 28 The groups of organisms that constitute mesh.

Bacteria and fungi. They consume the organic matter thereby reduce BOD. 29 a) RNA interference (RNAi) 3 b) The best method used to prevent the attack of nematode is RNA interference (RNAi). It involves silencing of a specific mRNA of nematode. Here the complementary dsRNA molecule that binds to and prevents translation of the mRNA (silencing). 30 a) B- stable population 3 b)A- expanding positive growth. Pre reproductive age people is more than post reproductive age, B - declining negative growth.post reproductive age is more than pre reproductive . SECTION D 31 . 5 spermatogenesis oogenesis Occur in testis In ovary Gamete- sperm Gamete- ovum Begins at puberty Begins at embryonic stage Four gametes are produced One gamete is produced Limited growth phase Very elaborate growth phase 32 In lac operon,lactose is the inducer.Inducer binds with repressor protein but 5 repressor cannot bind to op-erator gene,the free operator gene induces the RNA polymerase to bind with promoter and initiates tran-scription Three structural genes synthesise three mRNAs to produce enzymes. 33 a.The waste water with large amount of organic matters ,microbes (1) 5 b.cause communicable disease(1) c.Primary sewage treatment - physical removal of impurities through sedimentation and filtration(1) Secondary sewage treatment - role of microbes, reduction in BOD(2)

Physical Education Maximum marks: 70 Time Allowed: 3hours General Instructions ● The question paper consists of 30 questions and all are compulsory. ● Question 1-12 carries 01 mark each and are Multiple Choice Questions. ● Questions 13-16carry 02 marks each and shall not exceed 40-60 words. ● Questions 17-26 carry 03 marks each and shall not exceed 80-100 words. ● Questions 27 - 30 carry 05 marks each and shall not exceed 150-200 words. Section A 1. Name the type of tournament in which the defeated team gets eliminated and does not have another chance to play. a. Bye b. League C. Fixture d. Knockout 2. Which food item has carbohydrates and fats? a Tomato and Almond b. Bread and butter

c Rice and Pules d. Potato and Tomato 3. Blood pressure is the force of blood in the arteries. When this pressure becomes abnormally high then it is called ----------- a. Heart Attack b. Blood sugar c Hypertension d. Cardiac arrest OR According to Asthanagyog Asana lies in what place - a. Second b. Third C. First d. Fifth 4. SPD's expended form is a. Sensory Processing Disorder b. Sensory processing department c Special police department d. Special processing Disorder

5. Which development is motor development? a. Sense Organs b. Postural deformity c. Disorder development d. Bones & muscles 6. Rikli and Jones senior citizen test was developed in a. 2000 b. 2002 C. 2001 d. 1990 7. The volume of blood flow to muscle tissues increases the most during a. Reading b. Eating c Exercise d. Walking 8. Our -------- are located on the back of our leg, below our knee. a. calf muscles

b. Ankle muscles Shoulder muscles d. Knee muscles 9 The word personality is derived from the Latin word a. Endomorphy b. Perjona c. Persona d. Person 10. The ballistic method is related to a. Strength development b. Coordination development C Speed development d. Flexibility development 11. If the BMI of a person is 28. It is considered as a. Obese b. Normal C. Underweight d. Overweight

12. The damage to muscles, ligaments and tendons is called a. Physical Injury b. Fracture C. Soft Tissue Injury d. Bone Injury 13. Identify the asanas given below and write the names. A------------------------------- B---------------------------- C--------------------------- D--------------------------------

14. Identify the common postural deformities and give their names. A------------------------ B-------------------------- C--------------------- D-------------------

15. Why the word 'differently-abled' is used in place of disabled nowadays? 16. What do you mean by Projectile & Power? OR What is Kinesiology? 17. Your grandmother is an active lady. She says she has much better fitness as compared with you because she takes a balanced diet, does regular exercise and often sits in the sunshine. Based on this case, answer the following questions. i, What is included in a balanced diet? a. Carbohydrates b. Vitamins c Proteins d. All of these ii. Which is not a direct benefit of a balanced diet? a. Makes us energetic b. Proper functioning of organs C Increases age d. Improves metabolism iii. Which vitamin do we get from sunshine?

a. Vitamin A b. Vitamin B C Vitamin C d. Vitamin D 18. Roshni, a girl of 14, faces difficulty in breathing. She usually gets a cough at night and sometimes early in the morning. She gets tired soon and also feels pain in her hands, feet, and shoulders. So, she takes an appointment with a doctor who finds out the disease at an early stage. Based on the above case, answer the following questions. i, What do you think about which disease Roshni is suffering from? a. Diabetes b. Hypertension c Asthma d. Obesity ii, What could be the reason behind the disease? a. Pollution b. Respiratory Disorder c Genetic Factor d. All of these iii. Which asana would be effective to cure the disease which Roshni had?

a. Tad asana b. Parvatasana c Vajrasana d. Savasana 19. Difference between the sagittal plane and horizontal plane. OR What do you mean by axis? Discuss various types of axes. 20. Explain the test items of the Physical Fitness Test. 21. How are sports injuries classified? 22. Discuss the sports participation of women in India. 23. What do you mean by Flexibility? 24. Discuss the causes of ODD. 25. What are the various factors affecting projectile trajectory? 26. Write a short note on vitamins. OR Write briefly about protein as an essential component of the diet. 27. Explain in detail the role of physical activities in the development of personality. Or what is the role of sports in personality development? 28. Recall the adaptive effects that take place in our body after engaging in exercise for a longer period. OR

What do you understand by Coordinative ability? Discuss different types of coordinative abilities. 29. What is a league tournament? Draw a fixture of 10 teams using the round method. OR What do you mean by league match or round-robin tournament? 30. Discuss in detail about the Rockport fitness walking Test.

Physical Education Maximum marks: 70 Time Allowed: 3hours General Instructions ● The question paper consists of 30 questions and all are compulsory. ● Question 1-12 carries 01 mark each and are Multiple Choice Questions. ● Questions 13-16carry 02 marks each and shall not exceed 40-60 words. ● Questions 17-26 carry 03 marks each and shall not exceed 80-100 words. ● Questions 27 - 30 carry 05 marks each and shall not exceed 150-200 words. Section A 1. Name the type of tournament in which the defeated team gets eliminated and does not have another chance to play. a. Bye b. League C. Fixture d. Knockout ANS: Knockout 2. Which food item has carbohydrates and fats?

a Tomato and Almond b. Bread and butter c Rice and Pules d. Potato and Tomato ANS: Bread and butter 3. Blood pressure is the force of blood in the arteries. When this pressure becomes abnormally high then it is called ----------- a. Heart Attack b. Blood sugar c Hypertension d. Cardiac arrest ANS: Hypertension OR According to Asthanagyog Asana lies in what place - a. Second b. Third C. First d. Fifth ANS: Third

4. SPD's expended form is a. Sensory Processing Disorder b. Sensory processing department c Special police department d. Special processing Disorder ANS: Sensory Processing Disorder 5. Which development is motor development? a. Sense Organs b. Postural deformity c. Disorder development d. Bones & muscles ANS: Bones & muscles 6. Rikli and Jones senior citizen test was developed in a. 2000 b. 2002 C. 2001 d. 1990 ANS: 2001

7. The volume of blood flow to muscle tissues increases the most during a. Reading b. Eating c Exercise d. Walking ANS: Exercise 8. Our -------- are located on the back of our leg, below our knee. a. calf muscles b. Ankle muscles Shoulder muscles d. Knee muscles ANS: calf muscles 9 The word personality is derived from the Latin word a. Endomorphy b. Perjona

c. Persona d. Person ANS: Persona 10. The ballistic method is related to a. Strength development b. Coordination development C Speed development d. Flexibility development ANS: Flexibility development 11. If the BMI of a person is 28. It is considered as a. Obese b. Normal C. Underweight d. Overweight ANS: Overweight 12. The damage to muscles, ligaments and tendons is called a. Physical Injury

b. Fracture C. Soft Tissue Injury d. Bone Injury ANS: Soft Tissue Injury 13. Identify the asanas given below and write the names. A. SHALABHASANA B. CHAKRASANA C.MATSYASANA D.BHUJANGASANA 14. Identify the common postural deformities and give their names.

A.SCOLIOSIS B: FLAT FOOT C: KNOCK KNEE D: BOWLEGS

15. Why the word 'differently-abled' is used in place of disabled nowadays? ANS: The problem arises when the term \"differently-abled\" is used to refer to an individual \"disabled\" person. It is borderline cutesy and it diminishes the actual experiences of disabled people. It suggests that the term disability should be uncomfortable and therefore should be avoided. 16. What do you mean by Projectile & Power? ANS: Projectile: A projectile is an object on which the only force acting is gravity. Power: Power is the rate at which work is done (measured in watts (W), in other words, the work is done per second. OR What is Kinesiology? ANS: Kinesiology is a branch of physiology that studies mechanics and anatomy in relation to human movement. 17. Your grandmother is an active lady. She says she has much better fitness as compared with you because she takes a balanced diet, does regular exercise and often sits in the sunshine. Based on this case, answer the following questions. i, What is included in a balanced diet? a. Carbohydrates b. Vitamins c Proteins

d. All of these ii. Which is not a direct benefit of a balanced diet? a. Makes us energetic b. Proper functioning of organs C Increases age d. Improves metabolism iii. Which vitamin do we get from sunshine? a. Vitamin A b. Vitamin B C Vitamin C d. Vitamin D ANS: All of these Exp-Balanced diet comprises of carbohydrates, Vitamins, Proteins, Minerals, Fats, Etc. ii (c) Increases age Exp- Balanced diet increases our age only indirectly by improving our immune system and making us less prone to diseases. iii. (d) Vitamin D Exp- Sunlight is a free source of vitamin D.

18. Roshni, a girl of 14, faces difficulty in breathing. She usually gets a cough at night and sometimes early in the morning. She gets tired soon and also feels pain in her hands, feet, and shoulders. So, she takes an appointment with a doctor who finds out the disease at an early stage. Based on the above case, answer the following questions. i, What do you think about which disease Roshni is suffering from? a. Diabetes b. Hypertension c Asthma d. Obesity ii, What could be the reason behind the disease? a. Pollution b. Respiratory Disorder c Genetic Factor d. All of these iii. Which asana would be effective to cure the disease which Roshni had? a. Tad asana b. Parvatasana c Vajrasana d. Savasana

ANS: i (c) Asthma Exp- Asthma is a lung disease in which the airways get blocked or become a Narrow causing difficulty in breathing. ii (d) All of these Exp- Asthma can be caused due to Air Pollution, respiratory infection, Genetic Factors, etc. iii. (b) Parvatasana Exp- Parvatasana is very effective in curing Asthma. 19. Difference between the sagittal plane and horizontal plane. OR What do you mean by axis? Discuss various types of axes. ANS: A sagittal plane is a vertical plane passing from the rear to the front, dividing the body into left and right halves. It is also known as the anteroposterior plane. Most of the sports and exercise movements that are two dimensional, such as running, long jumping and somersault takes place in this plane. Transverse or Horizontal plane: The transverse plane divides the body into top and bottom halves. In fact, it divides the body into upper and lower sections. This plane lies horizontally that why it is also called a horizontal plane. Movements along this plane can include an ice skating spin or rotation to play a tennis shot. OR An axis is a straight line around which an object rotates. Movements at the joints of the human musculoskeletal system are mainly rotational and take place about a line perpendicular to the plane in which they occur. This line is known as the axis of rotation. There are the following types of axes of rotation: ● Sagittal axis: The sagittal axis passes horizontally from posterior to anterior. It is Formed by the intersection of the sagittal and transverse plane. The sagittal axis b. Frontal axis: The frontal axis passes horizontally from left to right. It is formed by passes from front to back. ● Frontal axis. Vertical axis. Frontal plane is perpendicular to the ground and divides the body into the front or anterior and back or posterior part. Axis of the

frontal plane is the sagittal axis. One of the examples of movement on the frontal plane could be shoulder abduction and addiction. ● Vertical axis: The vertical axis passes vertically from inferior to superior. It passes straight through the top of the head down between feet. It is formed by the intersection of the sagittal and frontal plane. It is also known as the longitudinal axis. It is the longest axis. 20. Explain the test items of the Motor Fitness Test. ANS:50 M Standing Start, 600 M Run/Walk, Sit & Reach, Partial Curl Up, Push Ups (Boys), Modified Push Ups (Girls), Standing Broad Jump, Agility – 4x10 M Shuttle 21. How are sports injuries classified? ANS: Sports injuries are classified in various ways. The classification can be based on the time taken for the tissues to become injured, the tissue type affected and seventy of the injury. These are detailed below 1. Soft tissue Injury ● Sprain ● Strain ● Contusion ● Abrasion ● Incision 2. Bone Injury

● Stress Fracture ● Green Stick Fracture ● Comminuted fracture ● Transverse Fracture ● Impacted Fracture 3. Joint Injury ● Dislocation of joint. 22. Discuss the sports participation of women in India. ANS: Sport is an area where gender inequality is strongly evident. The problem Is more sociopsychological than anything else. The first Indian women to participate in the Olympics was in 1952. In 1975, the Government of India instituted the national sports festival for women sports. The sports authority of India was set up in 1984 with the Objective of broadcasting of sports and nurturing of talented children in different age groups by providing the infrastructure, education, coaching facilities and other related facilities. Indian female sportspersons, such as Anju Bobby George, PT Usha, Sania Mirza, Anjali Bhagwat, Saina Nehwal have made a mark for themselves in the world of sports and are gaining respect. 23. What do you mean by Flexibility? ANS: It is the ability of the Joint to move to maximum range. The flexibility of an individual varies from joint to joint due to many reasons like the structure of joint, attachment of ligaments and tendon of joint, surrounding muscle etc. It is of two types an Active (to do the movement without external help and Passive (to the movement with internal help) flexibility. 24. Discuss the causes of ODD. ANS: The various causes of Oppositional Defiant Disorder are as follows: a. Biological or Genetic factors: Children are more susceptible of developing ODD if they have a parent with a history of ADHD or ODD.

b. Physical factors: the presence of ODD traits has been linked to the existence of abnormal amounts of some brain chemicals. These brain chemicals, known as neurotransmitters, keep the brain chemicals themselves balance properly. c Psychological factors: Children may develop ODD if they don't have good relations with parents or have neglectful parents or have the inability to develop a social relationships. 25. What are the various factors affecting projectile trajectory? ANS: The angle of Projection. ● Initial Velocity. ● Gravity. ● Air resistance. ● Projection of height relevant to the landing surface. ● Spin. 26. Write a short note on vitamins. ANS: Vitamins are complex compounds of carbon and essential for the normal functioning of body. It is important for the metabolism of fats and carbohydrates and helps to repair and maintenance of various tissues. Vitamins are natural substances found in plants and animals and known as Essential nutrients for human beings. Human body uses these substances to stay healthy and support its many functions. There are two types of vitamins: water-soluble and fat-soluble. Deficiencies of vitamins and minerals may be caused by disease states such as malabsorption. OR Write briefly about protein as an essential component of the diet. ANS: Proteins are the basic structure of all living cells. These are complex organic compounds. Protein is a chain of amino acids that contain carbon, oxygen, hydrogen, and nitrogen. These are two types of proteins: (i) Non-essential proteins (ii) Essential proteins

All meat and other animal products are sources of proteins. The best sources are eggs. Milk, meat, poultry, milk products, beans etc. Functions of Proteins: 1. The cells of muscles and ligaments are maintained with protein. 2. Proteins are needed for the growth and development of children. 3. Proteins are the main components of muscles, organs, and glands. 27. Explain in detail the role of physical activities in the development of personality. Or what is the role of sports in personality development? ANS: Physical activities and sports play an important role in the development of the personality of an individual. These activities help in shaping up the personality of an Individual such as: 1. Physical appearance: One of the primary aspects of one's personality is his Physical appearance. Both boys and girls are very much concerned about how they look. Physical activities are conducive to the growth and development of the Physique. Workouts in the gym are becoming a must for all the youngsters of today. So, this develops their outer personality which creates a good impression. 2. Social interactions: Physical activities and sports provide opportunities of interaction between athletes coming from different regions, speaking different languages, different caste and religion. This helps an Individual to develop a multi-dimensional personality. Moral Values through sports is responsible for the development of sound and ideal character, a very essential attribute of Personality. 3. Analytic thinking. This mental exercise enhance the intellectual abilities of the participants and broaden their mental horizon. It is well said that physique is of no use if not governed by analytic thinking, analyzing and Disciplined and assertive: In sports one learns to make sincere efforts, which reflect positively in the development of an individual's personality. Code of discipline is the fundamental learning of any physical activity and effective participation in sports. 4. Disciplined and assertive: In sports, one learns to make sincere efforts, which reflect positively in the development of an individual's personality. Code of discipline is a

fundamental learning of any physical activity and effective participation in sports. 5. Well balanced Individual: Physical activities also provide recreation which go a long way In producing perfectly happy, satisfied and balanced individual having a pleasing and energetic personality, having zest for life experiences, Physical activities and sports are the basic needs of human beings which help in the development of well-balanced personality, 28. Recall the adaptive effects that take place in our body after engaging in exercise for a longer period. ANS: The adaptive effects that take place in our cardiovascular system after engaging in exercise for a longer period are: 1. Increase in heart size we cannot do the exercise on our heart directly, but when we perform any exercise regularly, our heart size increases. Exercising develops the muscles of the heart. 2 Increase In heart rate generally an adult has a heart rate of 72 beats per minute while resting, but when he exercises, his heart rate increases as per the intensity and duration of the exercise. 3An increase in stroke volume is the quantity of blood which the heart pumps out in a single stroke. Due to the heart's size increases, the stroke volume increases 4 The decrease in cholesterol level Regular exercise reduces the cholesterol level in our blood, which has a direct link with blood pressure. 5. Increase in number and efficiency of capillaries Regular exercise increases the number of capillaries and their efficiency. OR What do you understand by Coordinative ability? Discuss different types of coordinative abilities. ANS: Coordinative abilities are those abilities that enable an individual to do various related activities accurately and efficiently. Coordinative abilities mainly depend on the Central Nervous System. Types: ● Orientation ability ● Coupling ability

● Reaction ability: a simple reaction ability b. Complex reaction Ability ● Balance Ability 29. What is a league tournament? Draw a fixture of 10 teams using the round method. ANS: The league tournament is one in which if it is a single league tournament then each team plays with every other team once, if it is a double league tournament then each team plays with every team twice. There are two methods of drawing fixture: a) Staircase method: Here, no. of teams (n) = 10 No. of matches = n(n-1)/2 = 45 b) Cyclic method: Here, no. of teams (n) = 10 No. of matches = n (n-1)/2 = 45 No. of rounds = no. of teams - 1= 10-1 = 9 OR

What do you mean by league match or round-robin tournament? League: These are also called Round robin tournament. There are two types of league tournaments: 1. Single league tournament: In this type of tournament, every team shall play once with every other team. The total number of matches in a single league n(n-1) 2 For example, if 10 teams are competing, the total number of matches to be played shall be n (n-1) 10(10-1) 2 2 = 10(9) 2 2. Double league tournament: In this type of tournament, every team shall play twice with every other team. The total number of matches shall be n (n - 1), e.g. 10 teams are competing for the total number of matches: n (n-1) - 10 (10 – 1) = 10 (9) = 90 matches. 30. Discuss in detail about the Rockport fitness walking Test. ANS: Rockport Fitness Walking Test : This test is very good to measure the Cardio Respiratory fitness of the Individual. Thus the objective of this test is to monitor the development of the athlete's maximum Cardio-Respiratory ability (VO2). Requirements of Test: (1) Running track (200 m or 400 m), (ii) Stopwatch, (ii) An Assistant/Helper. Administration of Test: ● Choose a windless day to conduct the test. ● Record your weight in pounds (lbs) ● Walk one mile (1609 mt) as fast as possible. ● Record the time to complete the one-mile walk. ● Immediately on finishing the walk record your heart rate (beats per minute). vi Determine your Maximum Cardio-Respiratory ability (VO2) from the calculation

Given below. Calculation Procedure: Analysis of the result is done by comparing It with the result of the previous test. It is expected that appropriate training between each test should be done to show Improvement. The formula used to calculate VO2 Max is : 132-853 - (0-0769 x weight) - (0-3877* Age) (6-315 Gender)-(3-2649 Time) - (0-1565 x Heart rate) Where a. Weight is in pounds (lbs). b. Gender: Male = 1 and Female = 0 c Time is expressed in minutes and seconds. d. Heart rate is in beats/minute e Age in years

MODEL EXAMINATION CHEMISTRY THEORY MM : 70 CLASS: XII Time: 3 Hours General Instructions. Read the following instructions carefully. a) There are 33 questions in this question paper. All questions are compulsory. b) Section A: Q. No. 1 to 2 are case-based questions having four MCQs or Reason Assertion type based on given passage each carrying 1 mark. c) Section A: Question 3 to 16 are MCQs and Reason Assertion type questions carrying 1 mark each d) Section B: Q. No. 17 to 25 are short answer questions and carry 2 marks each. e) Section C: Q. No. 26 to 30 are short answer questions and carry 3 marks each. f) Section D: Q. No. 31 to 33 are long answer questions carrying 5 marks each. g) There is no overall choice. However, internal choices have been provided. h) Use of calculators and log tables is not permitted. SECTION A (OBJECTIVE TYPE) 1. Read the passage given below and answer the following questions: (1x4=4) Manoj is an obedient student but some of his classmates were very mischievous. One day in the chemistry laboratory Manoj saw some students remove the label from two bottles containing methanol and dimethyl ether. Seeing this Manoj approach the teacher and informed about the incident. 1. The following questions are multiple choice questions. Choose the most appropriate answer: i. Which chemical is used to identify methanol and dimethyl ether if the teacher asked to perform the chemical test? a) PCC b) Na c) FeCl3 d) HCl ii. The carbonyl compound formed when methanol gets oxidised using the acidified potassiumdichromate and can also be obtained by ozonolysis of: a) Methane b) Ethene c) Pent-2-ene d) But-2-ene OR Which of the following method is used for preparation of symmetrical and unsymmetrical ethers? a) Williamson’s synthesis b) Riemer-Tiemann reaction c) Kolbe’s reaction d) None of the above 1

iii. An organic compound A reacts with CH3MgBr followed by hydrolysis gives B on dehydration under mild conditions gives propene. Compounds A and B are respectively. a) Ethanol, Ethanal b) Propanol, Propanal c) Ethanal, Ethanol d) Ethanal, Propan-2-ol iv. Ethers are treated with an aqueous solutions of A in order to remove peroxides from it. Identify the A from the following options. a) KI b) Br2 c) KCNS d) Na2S2O3 2. Read the passage given below and answer the following questions: (1x4=4) During experimental work in chemistry lab Raman is inserting a glass tube in a rubber cork, he got a cut in his finger and started bleeding. A student of the class noticed it and brought a bottle of ferric chloride solution, while another student brought a bottle of potassium chloride solution. On sensing some trouble, the chemistry teacher immediately rushed to the students and asked the reason. On knowing the problem she advised the student to apply ferric chloride solution on the cut and then go to the medical room of the school. When a few drops of ferric chloride were applied on the cut, the bleeding was arrested. In these questions (Q. No 5-8 , a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices. a) Assertion and reason both are correct statements and reason is correct explanation for assertion. b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. c) Assertion is correct statement but reason is wrong statement. d) Assertion is wrong statement but reason is correct statement. (i) Assertion: FeCl3 is more preferred than KCl. Reason: Greater the valency more will be the coagulation. (ii) Assertion: FeCl3 is better than Fe(OH)3. Reason: Oppositely charged ions causes coagulation. (iii) Assertion: The degree of coagulation is inversely proportional to the valency of effective ions used. Reason: Hardy Schulze rule. (iv) Assertion: Coagulating value depends on concentration of electrolyte. Reason: Smaller the quantity required higher will be the coagulating power of ions. OR Assertion: Lyophilic sols are coagulated using electrolyte like alcohol. Reason: It is a reversible sol. Following questions (No. 3 -11) are multiple choice questions carrying 1 mark each: 2

3. Electrode potential of any electrode depends on a) Nature of Metal b) Temperature of solution c) Molarity of solution d) All of these. 4. Which one of the following amino acid has phenyl -OH group? a) Lysine OR b) Arginine c) Proline d) Tyrosine Nucleic acids are the polymers of a) Nucleosides b) Nucleotides c) Bases d) Sugars 5. Molality of an aqueous solutions of urea is 4.44mol/kg. In solution mole fraction of urea is a) 0.074 b) 0.00133 c) 0.008 6. The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of Cr3+ ion is a) 2.87 BM b) 3.87BM c) 3.47 BM d) 3.57 BM OR Which of the following has abnormally low value of third ionization enthalpy? a) Lanthanum b) Gadolinium c) Lutetium d) All of the above 7. Amongst the following, the strongest base in aqueous medium is… a) CH3NH3 b) NCCH2NH2 c) (CH3)2NH d) C6H5NHCH3 OR -NH2 group in the aniline is activating group and proceed reaction at a) Only para position b) Only ortho position c) Meta position d) Both (a) and (b) 3

8. Which of the following complex ions is diamagnetic in nature? a) [CoF6]3- b) [NiCl4]2- c) [Ni(CN)4]2- d) [CuCl2]2- OR The CFSE for octahedral [CoCl6]4- is 18,000 cm-1. The CFSE for tetrahedral [CoCl4]2- will be a) 18,000 cm-1 b) 16,000 cm-1 c) 8,000 cm-1 d) 20,000 cm-1 9. Generally, transition elements from coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid state? a) Ag2SO4 b) CuF2 c) ZnF2 d) Cu2Cl2 10. Select the by-product formed in the reaction ROH+PCl5→ RCl+A Here A is a) POCl3+HCl b) H3PO3+ No other by-product c) H3PO3+HCl d) POCl3+ No other by-product 11. Calculate the edge length of a crystal where the radius of cation and anion are 95pm and 181pm respectively a) 276pm b) 552pm c) 795pm d) 368pm In the following questions (Q. No. 12 - 16) a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices. a) Assertion and reason both are correct statements and reason is correct explanation for assertion. b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. c) Assertion is correct statement but reason is wrong statement. d) Assertion is wrong statement but reason is correct statement. 12. Assertion: All naturally occurring Amino Acid except glycine are optically active. Reason: Most naturally amino acid have L-configuration. 13. Assertion: SO2 is more powerful reducing agent in alkaline medium. Reason: SO2 react with H2S in presence of moisture and sulphur is precipitated. 4

14. Assertion : Perfectly ideal solution is possible with respect to binary solutions of two liquids. Reason : No two substances can have exactly the same nature of intermolecular forces and also the same magnitude. OR Assertion: When methyl alcohol is added to water, boiling point of water increases. Reason: When a non-volatile solute added to a volatile solvent elevation in boiling point is observed. 15. Assertion: The α-H atom in carbonyl compounds is less acidic. Reason: The anion formed after the loss of α-H atom is resonance stabilized. 16. Assertion: Addition reaction of water to but-1-ene in acidic medium yields butan-2-ol. Reason: Addition of water in acidic medium proceeds through the formation of secondary carbocation. SECTION B The following questions, Q.No 17 – 25 are short answer type and carry 2 marks each 17. Carry out the following conversions in not more than 2 steps i. Aniline to bromobenzene ii. Prop-1-ene to 1-flouropropane OR i. 2-bromopropane to 1-bromopropane ii. Ethanol to Propanenitrile 18. Nalorphene(C19H21NO3) similar to morphine is used to combat withdrawal symptoms in narcotic users.Dose of Nalorphene, generally given is 1.5mg. Calculate the mass of 1.5 x 10-3m aqueous solution required for the above dose. 19. Name the following co-oridation entities and describe there structures. i. [Fe(CN)6]4- ii. [Cr(NH3)4Cl2]+ OR Describe for the following complex ions, the type of hybridization, shape and magnetic property: i. [Fe(H2O)6]2+ ii. [NiCl4]2- 20. For a reaction A+B→P, the rate law is given by, r=k[A] ½ [B]2 i. What is the order of this reaction? ii. A first order reaction is found to have a rate constant k=5.5 x 10-14 s-1. Find the half life of the reaction. 5

OR The rate constant for a first order reaction is 60s-1. How much time will it take to reduce the initial concentration of the reactants to its 1/16th value? 21. During nuclear explosion, one of the products is 90Sr with half-life on 28.1 years. If 1µg of 90Sr was absorbed in the bones of newly born baby instead of calcium, how much of it will remain after 10 years and 60 years if it is not lost metabolically? 22. Give mechanism of preparation of ethoxyethane from ethanol. 23. Draw the structures of the following molecules: i) ClF3 ii)XeF6 iii) H2S2O7 iv)XeOF4 24. What happens when: i. Ethyl chloride treated with aq.KOH ii. Methyl chloride treated with KCN 25. Atoms of a compound O form ccp lattice and those of the element X occupy 1/8th of tetrahedral voids and Y occupy ½ of all octahedral voids. What is the simplest formula of the compound formed by the elements X, Y and O? SECTION C Q.No 26 -30 are Short Answer Type II carrying 3 mark each. 26. Give reasons for the following: i. The enthalpies of atomization of transition elements are high. ii. The E- value for the Mn3+/Mn2+ couple is much more positive than that of Cr3+/Cr2+ iii. Zn2+ salts are colourless. OR i. Zr and Hf have almost identical radii ii. The E- value for copper is positive iii. All though +3 oxidation state is the characteristic oxidation state of lanthanoids but Ce shows +4 state also. 27. Arrange the following in increasing order of property specified: i. Aniline, p-nitroaniline, p-toluidine (basic strength) ii. C2H5NH2, (C2H5)2NH, C6H5NH2(solubility in water) iii. C2H5OH, CH3CHO, CH3COOH(boiling point) OR i. Give a chemical test to distinguish between N-methylaniline and N,N-dimethyl aniline. ii. Acetophenone and benzophenone 6

iii. C2H5NH2, (C2H5)2NH, (C2H5)3N arrange in the increasing order of basic strength in aqueous solution. 28. Niobium crystallizes in bcc lattice with density 8.55gm/cm3 calculate the radius of the metal atom where the atomic mass of Nb is 93gmol-1. 29. i. Differentiate between globular and fibrous proteins. ii. Where does the water present in the egg go after boiling the egg? 30. Account for the following i. Acidic character increases from HF to HI ii. NH3 possess high boiling point iii. Bond enthalpy of F2 is lower than Cl2 SECTION D Q.No 31 to 33 are long answer type carrying 5 marks each. 30. Write the structures A, B, C, D and E from the following reactions. OR An organic compound with molecular formula C9 H10O forms 2,4-DNP derivative, reduces Tollen’s reagent and undergoes Cannizzaro reaction. On vigorous oxidation, it gives 1,2- benzenedicarboxylic acid. Identify the compound. 31. Account for the following i. Halogens are coloured ii. Dioxygen is gas but sulphur is a solid iii. An amorphous solid A burns in air to form a gas B which turns lime water milky. The gas is also produced as a by-product during roasting of sulphide KMnO4 solution and reduces Fe3+ to Fe2+. Identity the solid A and the gas B and write the reactions involved. OR i. Phosphorous has a greater tendency for catenation than Nitrogen. ii. Why do noble gases have very low boiling points. X2 is a greenish yellow gas with pungent smell and used in purification of water. On dissolving water, it gives a solution which turns blue litmus red. When it is passed through NaBr solution Br2, is obtained. 7

a) Identify the gas. b) What are products obtained when X2 reacts with ammonia? Give chemical equations. c) What happens when X2 reacts with cold and dilute NaOH solution? Write chemical equation and give the name of reaction. 32. The conductivity of sodium chloride at 298 K has been determined at different concentrations and the results are given below: Concentration/M 0.001 0.010 0.020 0.050 0.100 102 x K/Sm1 1.237 11.85 23.15 55.53 106.74 i. Calculate Λm for all concentrations and draw a graph between Λm and c1/2. Find the value of Λm. ii. Why is alternating current used for measuring resistance of an electrolytic solutions. OR i. A voltaic cell is set up at 250C with the following half cells: Al/Al3+(0.001 M) and Ni/Ni2+ (0.50 M) Calculate the cell voltage [E0 Ni2+/Ni= -0.25 V, E0 Al3+/Al= -1.66 V] ii. Can absolute electrode potential of an electrode be measured? 8

MARKING SCHEME CHEMISTRY-XII ANSWER KEY: 1.(i) b (ii) b or a (iii) d (iv) a 2.(i) a (ii) a (iii) d (iv) a or a 3. d 4. d or b 5. a 6. b 7. c or d 8. c or c 9. b 10. a 11. b 12. c 13. b 14. c or d 15. d 16. a 17.(i)Aniline to benzenediazoniumchloride(nitrousacid) and then to bromobenzene(Cu/HBr). (ii) propene to 1-bromopropane(HBr) and then to flouropropane(AgF) 18. molarmass=311g/mol,1.5mol nalorphene=467mg,required=3.21g 19. (i) 6,octahedral,inner orbital (ii) 6,octahedral,inner orbital Or

(i)Sp3d2,octahedral, paramagnetic,(ii) sp3d,tetrahedral,para 20. (i) 5/2 order (ii) 444s or t= 4.62 x 10-2s 21. After 10 years [R] = 0.7814μg,After 60 years [R]= 0.2278μg 22. Refer ncert text.(page no: 337) 23. t-shaped (ii) Distorted octahedral (iv) Squarepyramidal 24. (i) Ethanol (ii) Ethylcyanide 25. XY2O4 26.(i)Strong metallic bond due to greater unpaired electrons. (ii) Due to much larger 3rd IP of Mn as Mn2+ is very stable on account of d5 (iii) Due to completely filled d-subshell hence no d-d transition. 27.(i) p-nitoaniline<aniline<p-toluidine (ii) C6H5NH2<(C2H5)2NH<C2H5NH2 (iii) Acid<alcohol<aldehyde Or (i)Hintsberg test. N-methylaniline + benzenesulphonylchloride gives precipitate and insoluble in alkali. But N,N-dimethylaniline + benzenesulphonylchloride gives no precipitate. (ii) Iodoform test. Acetophenone gives yellow precipitate. (iii) C2H5NH2<(C2H5)3N<(C2H5)2NH. 28. a= 330.5pm r= 143pm. 29.(i)Fibrous: insoluble in water, chemically inactive,linear in shape,stable to moderate temperature. Globular: Soluble in water, chemically active, spherical shape, unstable. (ii) The water soluble globular protein egg gets denatured and get coagulated into hard and rubbery insoluble mass.

30.(i) Increase from HF to HI due increased bond length cleavage of H-bond more easier. (ii) Due intermolecular H-bonding. (iii) Small size of F2 cause repulsion so easy cleavage hence bondenthalpy lowers than Cl2. 31. A=Acetophenone B=Ethylbenzene C= Benzoic acid D= Sodium benzoate E= CHI3. 32. (i) Due to absorbtion of energy in visible light by their molecules for excitation of outer electronsof higher energy levels. (ii) Dioxygen small size and high electronegativity and form multiple p������-p������ bond.Sulphur bigger size and lower electronegativity prefer S-S single bonds. (iii) Sulphur, sulphurdioxide. Or (i)Due to larger size and lower electronegativity, P usually form P-P single bonds and hence exist as tetrahedral P4 molecules. (ii) Noble gases being monoatomic have no interatomic forces except weak dispersion forces and therefore, they are liquefied at very low temperatures. Hence, they have low boiling points. (iii) a. Cl2 b. 8NH3 + Cl2 → 6NH4Cl + N2 ; NH3 + 3Cl2 → NCl3 + 3HCl c. 2NaOH + Cl2 → NaCl + NaOCl + H2O 33. (i) Λm=123.70Scm2mol-1,118.50Scm2mol-1,115.75Scm2mol-1110.06Scm2mol-1,106.74 Scm2mol-1 C1/2 = 0.0,0.0316,0100,0.141,0.316 (ii) AC is used to prevent electrolysis so that concentration of ions in the solution remains constant. Or (i)E0cell+ 1.41V, Ecell=1.46V Anode: [Al(s) → Al3+(aq) + 3e] x 2 Cathode: [Ni2+(aq) + 2e → Ni(s)] x 3 (ii) No, only the difference in the potential between electrodes can be measured.This is due to the reason that oxidation or reduction cannot occur alone.So,when we measure electrode potential we have to take a reference electrode.

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