MCQ OF RESPIRATION CLASS 10

 MCQs from the topic “Respiration” (Class 10 Biology, CBSE Board) based on PYQ (Previous Year Question) patterns.

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🔬 Respiration – Class 10 Biology MCQs (CBSE PYQ Type)

1. Respiration is a process of:

A. Release of energy
B. Intake of oxygen
C. Breakdown of food
D. All of the above

2. The energy released during respiration is stored in the form of:

A. ADP
B. ATP
C. AMP
D. NADH

3. Which gas is released during aerobic respiration?

A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen

4. The first step of respiration is:

A. Krebs cycle
B. Glycolysis
C. Electron transport chain
D. Fermentation

5. Glycolysis takes place in:

A. Mitochondria
B. Nucleus
C. Cytoplasm
D. Ribosome

6. End products of aerobic respiration are:

A. Ethanol and CO₂
B. Lactic acid
C. CO₂ and H₂O
D. Glucose and oxygen

7. Anaerobic respiration in yeast produces:

A. Lactic acid
B. Ethanol and CO₂
C. Pyruvate
D. Acetic acid

8. Which organism performs anaerobic respiration?

A. Human
B. Fish
C. Yeast
D. Frog

9. Breakdown of glucose into pyruvate is called:

A. Fermentation
B. Glycolysis
C. Oxidation
D. Diffusion

10. How many ATP molecules are produced in aerobic respiration?

A. 2
B. 4
C. 36–38
D. 10

11. Muscle cramps are caused due to accumulation of:

A. Ethanol
B. CO₂
C. Lactic acid
D. Pyruvate

12. Which structure is called the “powerhouse of the cell”?

A. Nucleus
B. Ribosome
C. Chloroplast
D. Mitochondria

13. Respiration occurs:

A. Only during day
B. Only during night
C. Only in plants
D. All the time

14. In anaerobic respiration, the final electron acceptor is:

A. Oxygen
B. Glucose
C. Pyruvate
D. Carbon dioxide

15. Which step of respiration does not require oxygen?

A. Krebs cycle
B. Glycolysis
C. ETS
D. Oxidative phosphorylation

16. Which of the following is NOT a product of respiration?

A. Energy
B. CO₂
C. Water
D. Oxygen

17. Exchange of gases in humans occurs in:

A. Bronchi
B. Trachea
C. Alveoli
D. Larynx

18. Respiration is a:

A. Physical process
B. Chemical process
C. Mechanical process
D. Diffusion process

19. During heavy exercise, muscles respire anaerobically due to lack of:

A. Food
B. Glucose
C. Oxygen
D. Water

20. Which part of mitochondria contains enzymes for respiration?

A. Outer membrane
B. Inner membrane
C. Cristae
D. Matrix

21. The process of breathing is controlled by:

A. Heart
B. Brain
C. Lungs
D. Diaphragm

22. Which blood cells help in transport of oxygen?

A. WBC
B. Platelets
C. RBC
D. Plasma

23. Respiration in plants occurs through:

A. Roots only
B. Leaves only
C. Stomata and lenticels
D. Flowers

24. The process of releasing energy from food is called:

A. Nutrition
B. Respiration
C. Digestion
D. Excretion

25. Which gas is essential for aerobic respiration?

A. CO₂
B. Hydrogen
C. Oxygen
D. Nitrogen

26. In which respiration more energy is released?

A. Anaerobic
B. Aerobic
C. Both same
D. None

27. The end product of anaerobic respiration in muscles is:

A. Ethanol
B. Lactic acid
C. CO₂
D. Acetic acid

28. Breathing rate increases during exercise to:

A. Remove nitrogen
B. Take in more oxygen
C. Remove water
D. Reduce CO₂ only

29. Which enzyme helps in cellular respiration?

A. Amylase
B. Pepsin
C. Catalase
D. Respiratory enzymes

30. Which statement is correct?

A. Respiration occurs only in animals
B. Respiration and breathing are same
C. Respiration releases energy
D. Respiration stops during sleep

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✅ Answer Key

1. D

2. B

3. C

4. B

5. C

6. C

7. B

8. C

9. B

10. C

11. C

12. D

13. D

14. C

15. B

16. D

17. C

18. B

19. C

20. D

21. B

22. C

23. C

24. B

25. C

26. B

27. B

28. B

29. D

30. C