MCQ Questions for Class 10 Science: Ch 6 Life Processes
1. 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
► b) dialysis
2. The mode of nutrition found in fungi is:
(a) Parasitic nutrition
(b) Holozoic nutrition
(c) Autotrophic nutrition
(d) Saprotrophic nutrition
► (d) Saprotrophic nutrition
3. 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.
► b) having cartilaginous rings
4. The site of photosynthesis in the cells of a leaf is
(a) chloroplast
(b) mitochondria
(c) cytoplasm
(d) protoplasm
► (a) chloroplast
5. 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.
► (a) Starch breaking down into sugars.
6. During contraction of heart, what prevents backflow of blood?
a) Thin walls of atria
b) Thick muscular walls of ventricles
c) Valves in heart
d) All of the above
► c) Valves in heart
7. Which region of the alimentary canal absorbs the digested food?
(a) Stomach
(b) Small intestine
(c) Large intestine
(d) Liver
► (b) Small intestine
8. Woody plants carry gaseous exchange through
a) root hair
b) stem hair
c) Lenticels
d) epidermal cells.
► (c) Lenticels
9. Amoeba shows following kind of nutrition –
(a) autotrophic
(b) holozoic
(c) saprotrophic
(d) parasitic
► (b) holozoic
10. The contraction and expansion movement of the walls of the food pipe is called:
(a) translocation
(b) transpiration
(c) peristaltic movement
(d) digestion
► (c) peristaltic movement
11. The exit of unabsorbed food material is regulated by
(a) liver
(b) anus
(c) small intestine
(d) anal sphincter
► (d) anal sphincter
12. 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
► d) carbon dioxide
13. 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
► (c) starch
14. 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
► (b) Lactic acid + Energy
15. The breakdown of pyruvate to give carbon di-oxide, water and energy takes place in
(a) cytoplasm
(b) mitochondria
(c) chloroplast
(d) nucleus
► (b) mitochondria
16. The filtration units of kidneys are called –
a) Ureter
b) Urethra
c) Neurons
d) nephrons.
► d) nephrons
17. Glycolysis process occurs in which part of the cell?
(a) Cytoplasm
(b) Nucleus
(c) Mitochondria
(d) Chloroplast
► (a) Cytoplasm
18. 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
► a) Pisces only
19. The respiratory pigment in human beings is:
(a) carotene
(b) chlorophyll
(c) haemoglobin
(d) mitochondria
► (c) haemoglobin
20. The movement of food in phloem is called:
(a) transpiration
(b) translocation
(c) respiration
(d) evaporation
► (b) translocation
21. Name the pores in a leaf through which respi-ratory exchange of gases takes place.
(a) Lenticels
(b) Vacuoles
(c) Xylem
(d) Stomata
► (d) Stomata
22. Name the part of alimentary canal receiving bile from the liver.
a) Oesophagus
b) Stomach
c) Small intestine
d) Large intestine
► c) Small Intestine
23. Name a circulatory fluid in the human body other than blood.
(a) Platelets
(b) RBC
(c) Lymph
(d) Plasma
► (c) Lymph
24. The xylem in plants are responsible for
(a) transport of water
(b) transport of food
(c) transport of amino acids
(d) transport of oxygen
► (a) transport of water
25. A blood vessel which pumps the blood from the heart to the entire body:
(a) artery
(b) capillary
(c) Vein
(d) Haemoglobin
► (a) artery
26. The kidneys in human beings are parts of the system for
(a) nutrition
(b) respiration
(c) excretion
(d) transpiration
► (c) excretion
27. Name the tube which connects the kidneys to the urinary bladder.
(a) Urethra
(b) Nephron
(c) Tubule
(d) Ureter
► (d) Ureter
28. The breakdown of pyruvate to give carbon dioxide, water and energy takes place in
(a) cytoplasm
(b) mitochondria
(c) chloroplast
(d) nucleus
► (b) mitochondria
29. 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
► (d) hippocampus, exocoetus, anabas
30. Where is the dirty blood in our body filtered?
(a) Heart
(b) Lungs
(c) Ureter
(d) Kidneys
► (d) Kidneys
31. 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
► (a) Tubule
32. Large intestine in man mainly carries out
(a) absorption
(b) assimilation
(c) digestion of fats
(d) digestion of carbohydrates
► (a) absorption
33. A gland not associated with the alimentary canal is
(a) liver
(b) salivary glands
(c) pancreas
(d) adrenal
► (d) adrenal
34. Which of the following are chiefly digested in the stomach?
(a) Carbohydrates
(b) Proteins
(c) Lipids
(d) Fats
► (b) Proteins
35. A biochemical compound that readily combines with oxygen and distributes it throughout the human body is
(a) water
(b) urea
(c) haemoglobin
(d) acetylcholine
► (c) haemoglobin
36. The autotrophic mode of nutrition requires
(a) carbon dioxide and water
(b) chlorophyll
(c) sunlight
(d) all of the above
► (d) all of the above
37. In a closed circulatory system, blood is completely enclosed within
(a) vessels
(b) heart
(c) skeleton
(d) sinuses
► (b) heart
38. Blood pressure is measured by an instrument called
(a) barometer
(b) sphygmomanometer
(c) photometer
(d) manometer
► (b) sphygmomanometer
39. 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) Tracheids and vessels are non-living conducting tissues.
► (c) Human kidney has about 1 million nephridia
40. A large quantity of one of the following is removed from our body by lungs:
(a) CO2 and H20
(b) CO2 only
(c) FLO only
(d) ammonia
► (a) CO2 and H20
41. The part of the digestive system where no digestion takes place is
(a) ileum
(b) stomach
(c) mouth
(d) oesophagus
► (d) oesophagus
42. 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
► (b) transpiration
43. 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
► (a) 120/80 mm of Hg
44. Autotrophic organisms include
(a) bacteria and virus
(b) bacteria and fungi
(c) green plants and some bacteria
(d) green plants and all bacteria
► (c) green plants and some bacteria
45. 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
► (c) dialysis
46. Which plant tissue transports water and min-erals from the roots to the leaf?
(a) Xylem
(b) Phloem
(c) Parenchyma
(d) Collenchyma
► (a) Xylem
47. 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.
► (e) Both A and R are false.
48. Assertion: Veins have thin walls to collect blood from different organs.
Reason: Blood in veins are not under pressure.
► (e) Both A and R are false.
48. Assertion: Veins have thin walls to collect blood from different organs.
Reason: Blood in veins are 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.
► (a) Both A and R are true and R is the correct explanation of A.
► (a) Both A and R are true and R is the correct explanation of A.
49. 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.
► (b) Both A and R are true but R is not the correct explanation of A.
► (b) Both A and R are true but R is not the correct explanation of A.
50. 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.
► (a) Both A and R are true and R is the correct explanation of A.
► (a) Both A and R are true and R is the correct explanation of A.