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Question

Which of the following statements are true about respiration?
(i) during inhalation, ribs move inward and diaphragm is raised.
(ii) the gaseous exchange takes place in the alveoli.
(iii) haemoglobin has greater affinity for carbon dioxide than oxygen.
(iv) alveoli increase surface area of the exchange of gases
(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (iii)
(d) (ii) and (iv)


Solution

(d) (ii) and (iv)
Statements (ii) and (iv) are correct. The explanation for incorrect statements is given below:
(i) During inhalation, ribs move outward and diaphragm moves downward.
(iii) Haemoglobin has greater affinity for carbon monoxide than oxygen.

Science
Lakhmir Biology 2013
Standard X

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