Class 10 Science MCQ Chapter 6 Life Process, Class 10 Science MCQ Question Answer, Class 10 Science Multiple Choice Question Answer to each chapter is provided in the list of SCERT Science Class 10 Objective Types Question Answer so that you can easily browse through different chapters and select needs one. Class 10 Science MCQ Chapter 6 Life Process Question Answer can be of great value to excel in the examination.
SCERT Class 10 Science MCQ Chapter 6 Life Process
SCERT Class 10 General Science MCQ Chapter 6 Life Process Notes covers all the exercise questions in SCERT Science Textbooks. The NCERT Class 10 Science MCQ Chapter 6 Life Process provided here ensures a smooth and easy understanding of all the concepts. Understand the concepts behind every chapter and score well in the board exams.
Life Process
Chapter – 6
Multiple Choice Questions & Answers
1. Which one of the following processes refers to the transfer of a source of energy from outside the body of an organism to the inside-
(a) Respiration .
(b) Transpiration.
(c) Nutrition.
(d) Excretion.
Ans: (c) Nutrition
2. The process of acquiring oxygen from outside the body and to use it in the process of break-down of food sources for cellular needs is called-
(a) Nutrition.
(b) Transportation.
(c) Excretion.
(d) Respiration.
Ans: (d) Respiration.
3. The process by which food and oxygen are carried from one place to another in the body is known as-
(a) Respiration.
(b) Transportation.
(c) Nutrition.
(d) Excretion.
Ans: (b) Transportation.
4. The process which removes the harmful wastes from the body of an organism is called-
(a) Nutrition.
(b) Respiration.
(c) Excretion.
(d) Transportation.
Ans: (c) Excretion.
5. The name of the process with the help of which carbon and energy requirements of an autotrophic organism are fulfilled, is-
(a) Photosynthesis.
(b) Transpiration.
(c) Translocation.
(d) Photophosphorylation.
Ans: (a) Photosynthesis.
6. Anerobic respiration occurs in –
(a) Mitochondria.
(b) Chloroplast.
(c) Nucleus.
(d) Cytoplasm.
Ans: (d) Cytoplasm.
7. Emulsification of fats is carried out by –
(a) Trypsin.
(b) Pepsin.
(c) Bile salt.
(d) Amylase.
Ans: (c) bile salt.
8. In which forms is nitrogen taken up by the plants from the soil-
(a) Sulphates and sulphites.
(b) Carbonates and carbides.
(c) Nitrates and nitrites.
(d) Amino acids and proteins.
Ans: (c) Nitrates and nitrites.
9. Which one of the following organisms breaks down the food material outside the body and then absorbs it-
(a) Mushroom.
(b) Cuscuta.
(c) Tape-worms.
(d) House -fly.
Ans: (a) Mushroom.
10. Which one of the following organisms derives nutrition from plants or animals without killing the plant or the animal-
(a) Mushroom.
(b) Bread mould.
(c) Yeast.
(d) Cuscuta.
Ans: (d) Cuscuta.
11. Which one of the following enzymes is secreted by the glands present in the walls of our buccal cavity
(a) Lipase.
(b) Pepsin.
(c) Trypsin.
(d) Salivary amylase.
Ans: (d) Salivary amylase.
12. Gastric glands present in the walls of the stomach are concerned with which of the following enzyme-
(a) Pepsin.
(b) Trypsin.
(c) Salivary amylase.
(d) Lipase.
Ans: (a) Pepsin.
13. Which one of the following glands are associated with the secretion of hydrochloric acid in our body-
(a) Salivary glands.
(b) Intestinal glands.
(c) Gastric glands.
(d) Liver.
Ans: (c) Gastric glands.
14. Which of the following digestive juices is associated with the making of food medium alkaline or basic-
(a) Saliva.
(b) Bile juice.
(c) Intestinal juice.
(d) Pancreatic juice.
Ans: (b) Bile juice.
15. Which of the following digestive juices is concerned with breaking down of large globules of fats into smaller globules in the small intestine-
(a) Intestinal juice.
(b) Pancreatic juice.
(c) Saliva.
(d) Bile juice.
Ans: (d) Bile juice.
16. Bile juice is the secretion of which of the following digestive gland-
(a) Pancreas.
(b) Liver.
(c) Salivary glands.
(d) Intestinal glands.
Ans: (b) Liver.
17. Which one of the following glands is concerned with the secretion of the enzyme trypsin-
(a) Liver.
(b) Gastric glands.
(c) Intestinal glands.
(d) Pancreas.
Ans: (d) Pancreas.
18. Which one of the following is an enzyme concerned with the digestion of starch-
(a) Lipase.
(b) Trypsin.
(c) Salivary amylase.
(d) Pepsin.
Ans: (c) Salivary amylase.
19. Which one of the following is an enzyme concerned with the digestion of fats-
(a) Pepsin.
(b) Lipase.
(c) Salivary amylase.
(d) Trypsin.
Ans: (b) Lipase.
20. Which one of the following is an enzyme concerned with the digestion of proteins-
(a) Salivary amylase.
(b) Hydrochloric acid.
(c) Lipase.
(d) Trypsin.
Ans: (d) Trypsin.
21. Proteins are converted to which of the following form after its complete digestion-
(a) Amino acids.
(b) Glucose.
(c) Fatty acids.
(d) Glycerol.
Ans: (a) Amino acids.
22. Complex carbohy. drates are converted to which of the following form after its complete digestion-
(a) Glucose.
(b) Glycogen.
(c) Starch.
(d) Maltose.
Ans: (a) Glucose.
23. Fats are digested in the small intestine to give which one of the following-
(a) Glucose.
(b) Amino acids.
(c) Sucrose.
(d) Fatty acids and glycerol.
Ans: (d) Fatty acids and glycerol.
24. Which one of the following is the site of the complete digestion of carbohydrates, proteins and fats in our body-
(a) Stomach.
(b) Buccal cavity.
(c) Small intestine.
(d) Large intestine.
Ans: (c) Small intestine.
25. Which one of the following is the product of aerobic respiration-
(a) Carbon dioxide.
(b) Water.
(c) Energy (ATP).
(d) All of the above.
Ans: (d) All of the above.
26. Fermentation is a process carried out by which one of the following organisms-
(a) Yeast.
(b) Bacteria.
(c) Green plants.
(d) Amoeba.
Ans: (a)Yeast.
27. Break- down of Glucose to pyruvate takes place in which of the following parts of the cells of all organisms-
(a) Mitochondria.
(b) Cell membrane.
(c) Cytoplasm.
(d) Plastids.
Ans: (c) Cytoplasm.
28. Break-down of pyruvate in aerobic respiration takes place in which of the following parts inside a cell of an organism.
(a) Cytoplasm.
(b) Mitochondria.
(c) Cell membrane.
(d) Golgi apparatus.
Ans: (b)Mitochondria.
29. Break down of pyruvate to release carbon dioxide, ethanol and energy takes place in which part of the cell of yeast-
(a) Mitochondria.
(b) Cell membrane.
(c) Lysosome.
(d) Cytoplasm.
Ans: (d) Cytoplasm.
30. The cause of cramps in our muscles during sudden activity is the build-up of which of the following substances in our muscles-
(a) Carbon dioxide.
(b) Water.
(c) Lactic acid.
(d) Ethanol)
Ans: (c) Lactic acid.
31. Which one of the following substances is released during the fermentation of yeast-
(a) Water.
(b) Lactic acid.
(c) Methanol.
(d) Ethanol.
Ans: (d) Ethanol.
32. Exchange of gases takes place in which of the following organs inside our body-
(a) wind pipe.
(b) Alveoli.
(c) Nephrons.
(d) Trachea.
Ans: (b) Alveoli.
33. Which part of our blood is associated with the transport of oxygen in our body-
(a) Red blood cells .
(b) White blood cells.
(c) Plasma.
(d) Platelet cells.
Ans: (a) Red blood cells .
34. Which part of our blood is associated with the transport of carbon dioxide in our body-
(a) White blood cells.
(b) Platelet cells.
(c) Plasma .
(d) Red blood cells.
Ans: (c) Plasma.
35. Which of the following part of the human heart collects the oxygen-rich blood from the lungs-
(a) Right atrium.
(b) Right ventricle.
(c) Left atrium.
(d) Left ventricle.
Ans: (c) Left atrium.
36. Which part of our heart collects the de-oxy- generated blood from all the parts of the body-
(a) Right atrium.
(b) Right ventricle.
(c) Left atrium.
(d) Left ventricle.
Ans: (a) Right atrium.
37. Which part of our heart contracts to send the oxygenated blood from the heart to all the parts of the body-
(a) Left atrium.
(b) Left ventricle.
(c) Right atrium.
(d) Right ventricle.
Ans: (b) Left ventricle.
38. Which part of our heart contracts to send the deoxygenated blood from the heart to the lungs for oxy- genation-
(a) Left atrium.
(b) Left ventricle.
(c) Right atrium.
(d) Right ventricle.
Ans: (d) Right ventricle.
39. Which of the following blood vessels is concerned with the movement of oxy-genated blood from the heart to the body-
(a) Aorta.
(b) Pulmonary arteries.
(c) Vena cava.
(d) Pulmonary veins.
Ans: (a) Aorta.
40. Which of the following blood vessels is concerned with the movement of oxy-genated blood from the lungs to the heart-
(a) Vena Cava.
(b) Pulmonary veins.
(c) Aorta.
(d) Pulmonary arteries.
Ans: (b) Pulmonary veins.
41. Which of the following blood vessels carries deoxygenated blood from the body to the heart-
(a) Aorta.
(b) Pulmonary arteries.
(c) Pulmonary veins.
(d) Vena cava.
Ans: (d) Vena cava.
42. Which of the following blood vessels carries deoxygenated blood from the heart to the lungs?
(a) Vena Cava.
(b) Pulmonary veins.
(c) Pulmonary arteries.
(d) Aorta.
Ans: (c) Pulmonary arteries.
43. Which of the following parts of blood is involved in the repairing of blood vessels?
(a) Red blood corpuscle.
(b) White blood corpuscle .
(c) Plasma.
(d) Platelets.
Ans: (d) Platelets.
44. Which of the following transports digested and absorbed fats from small intestine?
(a) Plasma.
(b) Red blood corpuscle.
(c) Lymph.
(d) White blood corpuscle.
Ans: (c) Lymph.
45. Which one of the following tissues is associated with the transport of water and minerals in the plant body-
(a) Phloem.
(b) Xylem.
(c) Collenchyma.
(d) Sclerenchyma.
Ans: (b) Xylem.
46. Which one of the following tissues is associated with the transport of food in the plant body
(a) Phloem.
(b) Xylem.
(c) Sclerenchyma.
(d) Collenchyma.
Ans: (a) Phloem.
47. Which one of the following processes is responsible for the upward movement of water in the xylem tissue-
(a) Respiration.
(b) Nutrition.
(c) Growth.
(d) Transpiration.
Ans: (d) Transpiration.
48. Which one of the following is the basic unit of filtration of the kidneys-
(a) Alveoli.
(b) Nephrons.
(c) Ureters.
(d) Urethra.
Ans: (b) Nephrons.
49. The cup-shaped end of a nephron is called-
(a) Glomerulus.
(b) Collecting duct.
(c) Ureter.
(d) Bowman’s capsule.
Ans: (d) Bowman’s capsule.
50. The enzyme present in our saliva-
(a) Amylase.
(b) Pepsin.
(c) Trypsin.
(d) Lipase.
Ans: (a) Amylase.
51. Sphygmo- manometer is an instrument which is used to measure the–of a man.
(a) Blood pressure.
(b) O₂ level in the blood.
(c) Blood sugar level.
(d) Level of urea in the blood.
Ans: (a) Blood pressure.
Very Short & Short Type Questions and Answers:
1. Define life processes.
Ans: The processes which together perform the maintenance functions in living organisms are known as life processes.
2. What is nutrition?
Ans: The process in which a source of energy that we call food is transferred from outside the body of an organism to the inside is called nutrition.
3. What is respiration?
Ans: The process of acquiring oxygen from outside the body and to use it in the process of break-down of food sources for cellular needs is called respiration.
4. What are autotrophs?
Ans: Some organisms use simple food material obtained from inorganic sources in the form of carbon dioxide and water. These organisms are called autotrophs.
5. What are heterotrophs?
Ans: Some organisms utilise complex substances as food material which have to be broken down into simpler forms before they can be used for the upkeep and growth of the body. These organisms are called het erotrophs.
6. What are enzymes?
Ans: Enzymes are bio-catalysts which break-down complex food molecules into the simpler ones.
7. What is the process by which the carbon and energy requirements of the autotrophic organisms are fulfilled?
Ans: Photosynthesis.
8. Define photosynthesis.
Ans: The process in which the autotrophic organisms take in carbon dioxide and water from the outside and convert them into carbohydrates in the presence of sunlight and chlorophyll, is called photosynthesis.
9. Give the equations for the chemical reaction involved in photosynthesis.
Ans:
10. Name the cell organelle that contains chlorophyll.
Ans: chloroplast.
11. Name the green dots present in the leaves. What function do they perform?
Ans: Chloroplast. They help in the photosynthesis in plants.
12. What are guard cells?
Ans: The cells which are responsible for the opening and closing of the stomatal pore in the leaves are known as guard cells.
13. Name the cells which is responsible for the opening and closing of the stomatal pore.
Ans: guard cells.
14. Why is nitrogen essential for plants ?
Ans: Nitrogen is essential for plants as it is used in the synthesis of proteins and other compounds.
15. How is nitrogen taken up by the plants?
Ans: Nitrogen is taken up by the plants in the form of inorganic nitrates and nitrites.
16. What do you mean by heterotrophic nutrition?
Ans: The mode of nutrition in which an organism has to depend on other organisms for food is called heterotrophic nutrition.
17. Name the enzyme found in saliva that is used in digestion of carbohydrates.
Ans: Salivary amylase.
18. What is the function of salivary amylase in the digestion of food?
Ans: Salivary amylase breaks down starch, which is a complex molecule to give sugar.
19. Name the digestive glands present in the buccal cavity mouth.
Ans: Salivary glands.
20. Name the substances secreted by gastric glands.
Ans: (i) Hydrochloric acid.
(ii) a protein digesting enzyme called pepsin.
(iii) mucus.
21. What is the function of pepsin in the digestion of food in human body?
Ans: The func-tion of pepsin in human body is to digest proteins present in our food in the stomach.
22. What is the function of mucus secreted by the gastric glands?
Ans: The mucus protects the inner lining of the stomach from the action of the acid under normal conditions.
23. Name the enzymes present in the pancreatic juice for digestion of proteins and fats.
Ans: The enzyme present in pancreatic juice used in digestion of proteins is called trypsin and that used in digestion of fats is known as pancreatic lipase.
24. What is the nature of bile juice secreted by the liver?
Ans: Alkaline.
25. What is the function of trypsin in the small intestine?
Ans: The function of trypsin in the small intestine is the break down the proteins into simpler form.
26. What is the function of pancreatic lipase?
Ans: The pancreatic lipase secreted by the pancreas is used to digest fats in the small intestine.
27. What do you mean by villi?
Ans: The inner lining of the small intestine has numerous finger-like projections, which increase the surface area for absorption. These projections are called villi.
28. What is aerobic respiration?
Ans: The mode of respiration in which glucose is broken down into carbon dioxide and water in presence of oxygen, to release energy, is called aerobic respiration.
29. What is anaerobic respiration?
Ans: The mode of respiration in which energy is released by the break-down of glucose in absence of oxygen, is called anaerobic respiration.
30. What is fermentation?
Ans: In the yeast cells, glucose is converted into pyruvate in the cytoplasm. Further pyruvate is converted into ethanol and carbon dioxide in absence of oxygen. This process is called fermentation.
31. Name the compound which is formed by the break-down of glucose in the first step of respiration.
Ans: Pyruvate.
32. What are the end products of the anaerobic respiration that takes place in the cells of yeast?
Ans: The end products of the anaerobic respiration that takes place in the cells of yeast are ethanol, carbon dioxide and energy.
33. What are the end products of the aerobic respiration that takes place in the mitochondria of a cell?
Ans: The end products of the aerobic respiration that takes place in the mitochondria of a cell are carbon dioxide, water and energy.
34. What are the end products of the anaerobic respiration that takes place in our muscle cells?
Ans: The end products of the anaerobic respiration that takes place in our muscle cells are lactic acid and energy.
35. Which substance causes cramps in our muscles during sudden activity?
Ans: Lactic acid.
36. What are alveoli?
Ans: Within the lungs, the air-passage divides into smaller and smaller tubes which finally terminate in some balloon- like structures which are known as alveoli.
37. What is double circulation?
Ans: Blood goes twice through the heart in the vertebrates other than fishes, during one cycle of passage through the body. This is known as double circulation.
38. Name the cells present in blood that help to clot the blood at the points of injury.
Ans: Platelet cells.
39. Name the two fluids that are involved in the process of transportation in our body.
Ans: Blood and lymph.
40. What is lymph?
Ans: Through the pores present in the walls of blood-capillaries, some amount of plasma, proteins and blood cells escape into intercellular spaces in the tissues. This is called lymph or tissue fluid.
41. Name the vascular tissues involved in the transportation in plants?
Ans: Xylem and phloem.
42. Name two strategies used by plants for the movement of water in the xylem.
Ans: (i) Root pressure. and
(ii) transpiration pull.
43. What is transpiration?
Ans: The loss of water in the form of vapour from the aerial parts of the plant is known as transpiration.
44. What do you mean by translocation?
Ans: The transport of soluble products of photosynthesis through the phloem tissue in plants is known as translocation.
45. What are nephrons?
Ans: Nephrons are the basic filtration units of kidneys.
46. Name the substances which are reabsorbed by the tubular part of the nephron from the primary urine.
Ans: Glucose, amino acids, salts and a large amount of water.
47. How can one control the urge to urinate?
Ans: The urinary bladder is muscular and hence it is under nervous control. As a result, one can usually control the urge to urinate.
48. Name the physical process by which oxygen and carbon dioxide are excreted by plants.
Ans: Diffusion.
