The air spaces may comprise upto _________ of total volume of leaf surface?
Correct answer: C. 40%
- A. 30%
- B. 20%
- C. 40%
- D. 50%
Explanation
Intercellular air spaces can occupy about 40% of a leaf's total volume, providing pathways for carbon dioxide and oxygen movement between the stomata and photosynthetic cells. Students may choose 30% because they underestimate the extensive air spaces present between mesophyll cells.
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About Gaseous Exchange in Lungs
Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.
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