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The underside of a typical leaf carries more stomata than the upper side because
AThe upper surface lacks chlorophyll for gas exchange
BThe lower surface stays cooler, reducing water loss
CInsects attack upper-surface stomata more easily
DPhloem tissue runs just below the upper surface
Answer & Solution
Correct answer: B. The lower surface stays cooler, reducing water loss
1. The upper surface faces direct sunlight and warms quickly.
2. Stomata there would lose water vapour rapidly.
3. Concentrating stomata below keeps water loss within limits.
4. So the lower-surface bias controls transpiration loss.
_Source: Selina Concise Biology Class 8, Ch on Transport in Plants (Mistral OCR'd PDF), Stomata Distribution_
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