Q3. What are the end products of the breakdown of one pyruvate molecule in the presence of oxygen?
a) 1 molecule of CO₂ (b) 3 molecules of CO₂ (c) H₂O (d) Both b and c
Q4. ATP supplies energy for which type of cellular reactions?
a) Endothermic (b) Exothermic (c) Oxidation (d) Both a and b
Q5. What is used to break the terminal phosphate in ATP?
a) Oxygen (b) Carbon dioxide (c) Water (d) None of these
Q6. Which statement is correct?
a) At night, oxygen release is the major event.
b) During the day, carbon dioxide produced in respiration is used in photosynthesis.
c) Plants do not respire during the day.
d) Carbon dioxide is released in large amounts during the day.
Q7. In fishes, oxygen enters the blood through the:
a) Mouth (b) Heart (c) Gills (d) Liver
Q8. Which statement is correct?
a) Cartilage rings help in gas exchange.
b) Cartilage rings absorb oxygen from air.
c) Cartilage rings prevent the air passage from collapsing.
d) Cartilage rings are present inside the lungs.
Q9. Large animals require respiratory pigments because:
a) Their lungs cannot absorb oxygen.
b) Their blood contains less water.
c) Diffusion alone cannot supply oxygen efficiently to all body cells.
d) They produce less carbon dioxide.
Q10. Why do the lungs always contain a residual volume of air even after exhalation?
a) To prevent the alveoli from bursting.
b) To keep the lungs warm.
c) To provide sufficient time for oxygen to be absorbed and carbon dioxide to be released.
d) To increase the amount of carbon dioxide in the blood.
Q11. Why are alveoli present in such large numbers in the lungs?
a) to increase the surface area available for gaseous exchange
b) to produce haemoglobin
c) to digest inhaled air
d) to store carbon dioxide
Q12. During inhalation, air enters the lungs mainly because:
a) the chest cavity becomes smaller
b) the ribs move downward and the diaphragm becomes dome-shaped
c) the chest cavity expands due to the lifting of ribs and flattening of the diaphragm
d) oxygen pulls air into the lungs
Q13. Which of the following correctly describes the transport of carbon dioxide from body tissues to the lungs?
a) It is transported mainly dissolved in blood plasma.
b) It is transported mainly attached to platelets.
c) It is transported only inside red blood cells.
d) It is transported as tiny gas bubbles.
Q14. The upper part of the respiratory tract is provided with small hair-like structures called ____________, which help remove germs, dust, and other harmful particles from inhaled air.
a) villi
b) alveoli
c) cilia
d) nephrons
Q15. Which adaptation makes oxygen transport in humans much faster than diffusion alone?
a) presence of villi in the intestine
b) haemoglobin inside red blood cells
c) bile salts in the liver
d) mucus in the trachea
Q16. Which of the following would reduce the efficiency of gaseous exchange without directly affecting haemoglobin?
a) decrease in alveolar surface area
b) decrease in red blood cells only
c) decrease in heart rate only
d) increase in blood glucose level
Q17. Which of the following statements is NOT correct?
a) Alveoli increase the surface area available for gaseous exchange.
b) Haemoglobin helps transport oxygen to body tissues.
c) Diffusion alone is sufficient to transport oxygen throughout the human body.
d) The large surface area of alveoli makes gas exchange more efficient.
Q18. During respiration, the energy released is primarily used to:
a) convert ATP into ADP
b) convert ADP and inorganic phosphate into ATP
c) produce glucose from carbon dioxide
d) break down proteins into amino acids
Q19. Energy is released from ATP when:
a) glucose is formed
b) the terminal phosphate bond is broken by water
c) ATP combines with oxygen
d) ATP enters the nucleus
Q20. The hydrolysis of one ATP molecule releases approximately:
a) 3.05 kJ/mol
b) 30.5 kJ/mol
c) 31.5 kJ/mol
d) 40.5 kJ/mol
Q21. Which statement is NOT correct about ATP?
a) ATP stores energy in its phosphate bonds.
b) ATP is formed using energy released during respiration.
c) ATP is used only for muscle contraction.
d) ATP supplies energy for many cellular processes.
Q22. Which statement is NOT correct about ATP?
a) ATP stores energy in its phosphate bonds.
b) Breaking the terminal phosphate bond releases energy.
c) ATP contains two phosphate groups.
d) Water is involved in the breakdown of ATP.
Q23. Energy stored in ATP becomes available to the cell when:
a) ATP is synthesized
b) ATP is broken down
c) glucose is absorbed
d) oxygen enters the lungs
Q24. Which of the following is common to both aerobic and anaerobic respiration?
a) both produce ethanol
b) both begin with the formation of pyruvate in the cytoplasm
c) both occur entirely in mitochondria
d) both require oxygen
Q25. Which statement is NOT correct?
a) Glucose first breaks down into pyruvate in the cytoplasm.
b) Aerobic respiration occurs in mitochondria and releases more energy than anaerobic respiration.
c) Lactic acid is produced in human muscle cells when oxygen is insufficient.
d) Ethanol is produced in human muscle cells during vigorous exercise.
🧠TopperGuru1 Concept Check
Before checking the answer key, ask yourself these two questions for every MCQ:
✅ Why is the correct option right?
✅ Why are the other three options wrong?
If you can explain both, your concept is truly clear. If not, revise the related NCERT concept and try again.
Remember: Real learning happens when you understand the reason, not when you memorize the answer.
Answer Key:-
Q1 – (b) | Q2 – (c) | Q3 – (d) | Q4 – (a) | Q5 – (c) | Q6 – (b) | Q7 – (c) | Q8 – (c) | Q9 – (c) | Q10 – (c) | Q11 – (a) | Q12 – (c) | Q13 – (a) | Q14 – (c) | Q15 – (b) | Q16 – (a) | Q17 – (c) | Q18 – (b) | Q19 – (b) | Q20 – (b) | Q21 – (c) | Q22 – (c) | Q23 – (b) | Q24 – (b) | Q25 – (d)
These Class 10 Science Chapter 1 – Life Processes Concept Clarity MCQs are designed to help students develop a strong understanding of NCERT concepts instead of relying on memorization. Regular practice of these CBSE and NCERT-based MCQs will improve conceptual clarity, logical thinking, and exam performance. For more chapter-wise MCQs, Assertion & Reason Questions, Case-Based Questions, PYQs, and NCERT Solutions, keep visiting TopperGuru1 and make your board exam preparation more effective.
Also check: Assertion & Reason Questions, Case-Based Questions, Important MCQs, and NCERT Extra Questions from Class 10 Science Chapter 1 – Life Processes on TopperGuru1.
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