Term 1 Questions - Life Processes

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MCQ Questions for Science Chapter 6 Life Processes Question 1. In which of the following group/ groups of animals, heart does not pump oxygenated blood to different parts of the body? (a) Pisces only (b) Amphibians only (c) Amphibians and reptiles only (d) Pisces and amphibians Answer (a) Pisces only Question 2. The filtration units of kidneys are called – (a) Ureter (b) Urethra (c) Neurons (d) nephrons. Answer (d) nephrons Question 3. Name the substances whose build up in the muscles during vigorous physical exercise may cause cramps? (a) Ethanol + Carbon dioxide + Energy (b) Lactic acid + Energy (c) Carbon dioxide + Water + Energy (d) Pyruvate Answer (b) Lactic acid + Energy

Question 4. When air is blown from mouth into a test – tube containing lime water, the lime water turned milky due to presence of: (a) oxygen (b) nitrogen (c) water vapour (d) carbon dioxide Answer (d) carbon dioxide Question 5. The mode of nutrition found in fungi is: (a) Parasitic nutrition (b) Holozoic nutrition (c) Autotrophic nutrition (d) Saprotrophic nutrition Answer (d) Saprotrophic nutrition Question 6. The site of photosynthesis in the cells of a leaf is (a) chloroplast (b) mitochondria (c) cytoplasm (d) protoplasm Answer (a) chloroplast

Question 7. During contraction of heart, what prevents back flow of blood? (a) Thin walls of atria (b) Thick muscular walls of ventricles (c) Valves in heart (d) All of the above Answer (c) Valves in heart Question 8. Woody plants carry gaseous exchange through (a) root hair (b) stem hair (c) Lenticels (d) epidermal cells. Answer (c) Lenticels Question 9. The contraction and expansion movement of the walls of the food pipe is called: (a) translocation (b) transpiration (c) peristaltic movement (d) digestion Answer (c) peristaltic movement

Question 10. The process by which blood is cleared of metabolic wastes in case of kidney failure is called (a) artificial kidney (b) dialysis (c) transplantation (d) filtration Answer (b) dialysis Question 11. Trachea do not collapse when there is not much air because they are: (a) thick and muscular (b) having cartilaginous rings (c) have valves (d) supported by larynx. Answer (b) having cartilaginous rings Question 12. Which of the following events in the mouth cavity will be affected if salivary amylase is lacking in the saliva? (a) Starch breaking down into sugars. (b) Proteins breaking down into amino acids. (c) Absorption of vitamins. (d) Fats breaking down into fatty acids and glycerol. Answer (a) Starch breaking down into sugars.

Question 13. Which region of the alimentary canal absorbs the digested food? (a) Stomach (b) Small intestine (c) Large intestine (d) Liver Answer (b) Small intestine Question 14. Amoeba shows following kind of nutrition. (a) autotrophic (b) holozoic (c) saprotrophic (d) parasitic Answer (b) holozoic Question 15. The exit of unabsorbed food material is regulated by (a) liver (b) anus (c) small intestine (d) anal sphincter Answer (d) anal sphincter

Question 16. When a few drops of iodine solution are added to rice water, the solution turns blue- black in colour. This indicates that rice water contains: (a) fats (b) complex proteins (c) starch (d) simple proteins Answer (c) starch Question 17. The breakdown of pyruvate to give carbon di-oxide, water and energy takes place in (a) cytoplasm (b) mitochondria (c) chloroplast (d) nucleus Answer (b) mitochondria Question 18. Glycolysis process occurs in which part of the cell? (a) Cytoplasm (b) Nucleus (c) Mitochondria (d) Chloroplast Answer (a) Cytoplasm

Question 19. The respiratory pigment in human beings is: (a) carotene (b) chlorophyll (c) haemoglobin (d) mitochondria Answer (c) haemoglobin Question 20. Name the pores in a leaf through which respiratory exchange of gases takes place. (a) Lenticels (b) Vacuoles (c) Xylem (d) Stomata Answer (d) Stomata Question 21. Name a circulatory fluid in the human body other than blood. (a) Platelets (b) RBC (c) Lymph (d) Plasma Answer (c) Lymph

Question 22. A blood vessel which pumps the blood from the heart to the entire body: (a) artery (b) capillary (c) Vein (d) Haemoglobin Answer (a) artery Question 23. Name the tube which connects the kidneys to the urinary bladder. (a) Urethra (b) Nephron (c) Tubule (d) Ureter Answer (d) Ureter Question 24. Single circulation, i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by which of the following: (a) hyla, rana, draco (b) whale, dolphin, turtle (c) labeo, chameleon, salamander (d) hippocampus, exocoetus, anabas Answer (d) hippocampus, exocoetus, anabas

Question 25. Which part of nephron allows the selective re absorption of useful substances like glucose, amino acids, salts and water into the blood capillaries? (a) Tubule (b) Glomerulus (c) Bowman’s capsule (d) Ureter Answer (a) Tubule Question 26. The part of the digestive system where no digestion takes place is (a) ileum (b) stomach (c) mouth (d) esophagus Answer (d) esophagus Question 27. Normal blood pressure (systolic/diastolic) is (a) 120/80 mm of Hg (b) 160/80 mm of Hg (c) 120/60 mm of Hg (d) 180/80 mm of Hg Answer (a) 120/80 mm of Hg

Question 28. The procedure used for cleaning the blood of a person by separating urea from it is called: (a) osmosis (b) filtration (c) dialysis (d) double circulation Answer (c) dialysis Question 29. Assertion: All proteins in our food are digested in small intestine only. Reason: The protein digesting enzymes are released onto small intestine. (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true. (e) Both A and R are false. Answer (e) Both A and R are false. Question 30. Assertion: When air is passed through lime water, lime water turns milky. Reason: Air contains 78% nitrogen and 21% oxygen. (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true. (e) Both A and R are false. Answer (b) Both A and R are true but R is not the correct explanation of A.

Question 31. Assertion: Human heart does not allow mixing of oxygen reach blood with carbon dioxide reach blood. Reason: Human heart has different chambers. (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true. (e) Both A and R are false. Answer (a) Both A and R are true and R is the correct explanation of A. Question 32. Assertion: Veins have thin walls to collect blood from different organs. Reason: Blood in veins is not under pressure. (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true. (e) Both A and R are false. Answer (a) Both A and R are true and R is the correct explanation of A. Question 33. Which plant tissue transports water and minerals from the roots to the leaf? (a) Xylem (b) Phloem (c) Parenchyma (d) Collenchyma Answer (a) Xylem

Question 34. Autotrophic organisms include (a) bacteria and virus (b) bacteria and fungi (c) green plants and some bacteria (d) green plants and all bacteria Answer (c) green plants and some bacteria Question 35. The process in which loss of water takes place in the form of water vapour through stomata is called (a) transportation (b) transpiration (c) guttation (d) translocation Answer (b) transpiration Question 36. A large quantity of one of the following is removed from our body by lungs: (a) CO2 and H2O (b) CO2 only (c) FLO only (d) ammonia Answer (a) CO2 and H2O

Question 37. Blood pressure is measured by an instrument called (a) barometer (b) sphygmomanometer (c) photometer (d) manometer Answer (b) sphygmomanometer Question 38. The autotrophic mode of nutrition requires (a) carbon dioxide and water (b) chlorophyll (c) sunlight (d) all of the above Answer (d) all of the above Question 39. Which of the following are chiefly digested in the stomach? (a) Carbohydrates (b) Proteins (c) Lipids (d) Fats Answer (b) Proteins

Question 40. Large intestine in man mainly carries out (a) absorption (b) assimilation (c) digestion of fats (d) digestion of carbohydrates Answer (a) absorption Question 41. Where is the dirty blood in our body filtered? (a) Heart (b) Lungs (c) Ureter (d) Kidneys Answer (d) Kidneys Question 42. The breakdown of pyruvate to give carbon dioxide, water and energy takes place in (a) cytoplasm (b) mitochondria (c) chloroplast (d) nucleus Answer (b) mitochondria

Question 43. The kidneys in human beings are parts of the system for (a) nutrition (b) respiration (c) excretion (d) transpiration Answer (c) excretion Question 44. The xylem in plants are responsible for (a) transport of water (b) transport of food (c) transport of amino acids (d) transport of oxygen Answer (a) transport of water Question 45. Name the part of alimentary canal receiving bile from the liver. (a) Esophagus (b) Stomach (c) Small intestine (d) Large intestine Answer (c) Small Intestine

Question 46. The movement of food in phloem is called: (a) transpiration (b) translocation (c) respiration (d) evaporation Answer (b) translocation Question 47. A gland not associated with the alimentary canal is (a) liver (b) salivary glands (c) pancreas (d) adrenal Answer (d) adrenal Question 48. A biochemical compound that readily combines with oxygen and distributes it throughout the human body is (a) water (b) urea (c) haemoglobin (d) acetylcholine Answer (c) haemoglobin

Question 49. In a closed circulatory system, blood is completely enclosed within (a) vessels (b) heart (c) skeleton (d) sinuses Answer (a) vessels Question 50. Which of the following statements is not correct? (a) Deoxygenated blood is poured into right atrium of heart. (b) The excretory units of flatworms are flame cells. (c) Human kidney has about 1 million nephridia (d) Tracheid and vessels are non-living conducting tissues. Answer (c) Human kidney has about 1 million nephridia

Life Processes Class 10 Assertion Reasoning Questions Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true. Q.1. Assertion (A): Plants lack excretory organs. Reason (R): Plants usually absorb essential nutrients. Answer (b) Q.2. Assertion (A): In anaerobic respiration, one of the end products is alcohol. Reason (R): There is an incomplete breakdown of glucose. Answer (a) Q.3. Assertion (A): In plants there is no need of specialized respiratory organs. Reason (R): Plants do not have great demands of gaseous exchange. Answer (a) Q.4. Assertion (A): Bile is essential for digestion of lipids. Reason (R): Bile juice contains enzymes. Answer (c)

Q.5. Assertion (A): Carbohydrate digestion mainly takes place in small intestine. Reason (R): Pancreatic juice contains the enzyme lactase. Answer (c) Q.6. Assertion (A): Aerobic respiration requires less energy as compared to anaerobic respiration. Reason (R): Mitochondria is the powerhouse of the cell. Answer (d) Q.7. Assertion (A): Arteries are thick-walled and elastic in nature. Reason (R): Arteries have to transport blood away from the heart. Answer (b) Q.8. Assertion (A): Human heart is four-chambered. Reason (R): Vena cava is the only artery that supplies deoxygenated blood to the heart. Answer (c) Q.9. Assertion (A): Energy is required to carry out different life processes. Reason (R): Energy is obtained in the form of ATP in the mitochondria. Answer (a)

Q.10. Assertion (A): Rings of cartilage are present in the throat, Reason (R): These ensure that the air-passage does not collapse Answer (a) Q.11. Assertion (A): Pyruvate is a six-carbon molecule Reason (R): It is prepared in the cytoplasm as the first step to cellular respiration Answer (d) Q.12. Assertion (A): Molecular movements are needed for life. Reason (R): Body structures made up of these molecules need continuous repair and maintenance Answer (a) Q.13. Assertion (A): Diffusion does not meet high energy requirements of multi- cellular organisms Reason (R): Diffusion is a fast process but occurs at the surface of the body. Answer (c) Q.14. Assertion (A): The opening and closing of the pore is a function of the guard cells. Reason (R): Stomatal pores are the site for exchange of gases by diffusion. Answer (b)

Q.15. Assertion (A): The purpose of making urine is to filter out undigested food from intestine Reason (R): Kidneys filter the waste and produce urine, Answer (d) Q.16. Assertion (A): The inner lining of the small intestine has numerous finger-like projections called villi. Reason (R): The villi increase the surface area for absorption. Answer (a) Q.17. Assertion (A): In human beings, the respiratory pigment is haemoglobin Reason (R): It is a type of protein which has high-affinity carbon dioxide. Answer (c) Q.18. Assertion: The plants store some of the waste products in their body parts. Reason: Raphides are the solid waste products of plants. Answer (b) Q.19. Assertion: The movement of water and dissolved salts in xylem is always upwards. Reason: ‘The upward movement of water is due to low pressure created by transpiration. Answer (a)

Q.20. Assertion: Photosynthesis takes place in green parts of the plants. Reason: Photosynthesis always takes place in leaves. Answer (c) Q.21. Assertion: The average number of heart beat of a person at rest is about 80 per minute. Reason: One contraction and relaxation of the heart constitutes a complete heartbeat. Answer (d) Q.22. Assertion: Ureters are the tubes which carry urine from kidneys to the bladder. Reason: Urine is stored in the urethra. Answer (c) Q.23. Assertion: Ventricles have thicker walls than auricles. Reason: Ventricles have to pump blood into various organs with great pressure Answer (a) Q.24. Assertion: Capillaries are the thinnest blood vessels. Reason: Capillaries connect the branches of arteries and veins. Answer (b)

Q.25. Assertion: Blood takes up oxygen from the alveolar air and release CO2 during exchange. Reason: The concentration of O, is more in alveolar air. Answer (b) Q.26. Assertion: The large intestine is the largest part of the alimentary canal. Reason: Tiger has a shorter small intestine, than herbivores. Answer (d) Q.27. Assertion: Most of the living organisms carry out aerobic respiration. Reason: Mitochondria is the site of aerobic respiration in the cell. Answer (b) Q.28. Assertion: The Bowman’s capsule and the tubule together make a nephron. Reason: The function of tubule is to allow the selective reabsorption of substances like glucose, amino acids, urea, salts and water into the blood capillaries. Answer (c) Q.29. Assertion: Pancreatic juice digests starch, proteins and fats. Reason: Pancreatic juice contains digestive enzymes like pancreatic amylase, trypsin and lipase. Answer (a)

Q.30. Assertion: The accumulation of lactic acid in the muscles causes muscle cramps. Reason: During vigorous physical exercise leg muscles respire anaerobically. Answer (a) Q.31. Assertion: Phloem helps in translocation of food from the leaves. Reason: Phloem provides mechanical support to plant. Answer (c) Q.32. Assertion: Trachea does not collapse, when there is no air in it. Reason: Trachea is supported by cartilage. Answer (a)

Life Processes Class 10 Case Based Questions Question 1: Read the following and answer any four questions from (i) to (v). All living cells need nutrients, O, and other essential substances. Also, the waste and harmful substances need to be removed continuously for healthy functioning of cells. So, a well-developed transport system is mandatory for living organisms. Complex organisms have special fluids within their bodies to transport such materials. Blood is the most commonly used body fluid by most of the higher organisms. Lymph also helps in the transport of certain substances. (i) Which of the following does not exhibit phagocytic activity? (a) Monocytes (b) Neutrophils (c) Basophil (d) Macrophage Answer (c) (ii) Amount of blood corpuscles in changed in dengue fever. One of the common symptoms observed in people infected with dengue fever is (a) significant decrease in RBC count (b) significant decrease in WBC count (c) significant decrease in platelets count (d) significant increase in platelets count. Answer (c)

(iii) Why are WBCs called soldiers of the body? (a) They are capable of squeezing out of blood capillaries. (b) They are manufactured in bone marrow. (c) They fight against disease causing germs. (d) They have granular cytoplasm with lobed nucleus. Answer (c) (iv) Name the blood cells, whose reduction in number can cause clotting disorder, leading to excessive loss of blood from the body. (a) Erythrocytes (b) Neutrophils (c) Leucocytes (d) Thrombocytes Answer (d) (v) Which of the following is the correct feature of lymph? (a) It is similar to the plasma of blood, but is colourless and contains less proteins. (b) It is similar to the WBCs of blood, but is colourless and contain more proteins. (c) It is similar to the RBCs of blood and red in colour. (d) It contains more fats. Answer (a)

Question 2: Read the following and answer any four questions from (i) to (v). Heterotrophic nutrition is a mode of nutrition in which organisms obtain readymade organic food from outside sources. The organisms that depend upon outside sources for obtaining organic nutrients are called heterotrophs. Heterotrophic nutrition is of three types: saprophytic, parasitic and holozoic nutrition. (i) In which of the following groups of organisms’ food material is broken outside the body and absorbed? (a) Mushroom, green plants, Amoeba (b) Yeast, mushroom, bread mould (c) Paramecium, Amoeba, Cuscuta (d) Cuscuta, lice, tapeworm Answer (b) (ii) Which of the following is a parasite? (a) Yeast (b) Taenia (c) Amoeba (d) Earthworm Answer (b) (iii) Which of the following is an example of saprotroph? (a) Grass (b) Mushroom (c) Amoeba (d) Paramecium Answer (b)

(iv) Heterotrophic nutrition involves (a) production of simple sugar from inorganic compounds (b) utilization of chemical energy to prepare food (c) utilization of energy obtained by plants (d) all of these. Answer (c) (v) In Paramecium, food enters the body through (a) mouth (b) pseudopodia (c) cilia (d) cytostome Answer (d) ••••••

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