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| 1. |
(i) During inhalation, ribs move inward and diaphragm is raised(ii) In the alveoli, exchange of gases takes place i.e., oxygen fromalveolar air diffuses into blood and carbon dioxide from bloodinto alveolar air(iii) Haemoglobin has greater affinity for carbon dioxide thanoxygen(iv) Alveoli increase surface area for exchange of gases(a) (i) and (iv) (b) (ii) and (iii)(c) (i) and (iii) (d) (ii) and (iv) |
| Answer» (d) (ii) and (iv) | |