Select the sequence of steps in Respiration. A. Diffusion of gases (O2 and CO2) across alveolar membrane. B. Diffusion of O2 and CO2 between blood and tissues. C. Transport of gases by the blood. D. Pulmonary ventilation by which atmospheric air is drawn in and CO2 rich alveolar air is released out. E. Utilisation of O2 by the cells for catabolic reactions and resultant release of CO2. Choose the correct answer from the options given below:
Answer: (C) (D), (A), (C), (B), (E). Answer: (c) (D), (A), (C), (B), (E) Solution: NCERT lists respiration steps in order: (i) breathing/pulmonary ventilation [D], (ii) diffusion of gases across alveolar membrane [A], (iii) transport of gases by blood [C], (iv) diffusion between blood and tissues [B], (v) utilisation of O2 by cells [E].
- A.(B), (C), (E), (D), (A)
- B.(A), (C), (B), (E), (D)
- C.(D), (A), (C), (B), (E)✓
- D.(C), (B), (A), (E), (D)
Correct Answer
(C) (D), (A), (C), (B), (E)
Solution & Explanation
Answer: (c) (D), (A), (C), (B), (E) Solution: NCERT lists respiration steps in order: (i) breathing/pulmonary ventilation [D], (ii) diffusion of gases across alveolar membrane [A], (iii) transport of gases by blood [C], (iv) diffusion between blood and tissues [B], (v) utilisation of O2 by cells [E]. This gives the sequence D, A, C, B, E. NCERT: Ch 14, p.185, line 21 — "Breathing or pulmonary ventilation by which atmospheric air is drawn in"