Q.3
Aplant scientist studying drought tolerance in different crop varieties observes that one variety consistently maintains higher
water use efficiency (WUE) compared to others under water stress conditions. What physiological adaptation might explain
this higher WUE?
- Physiological Drought Tolerance Mechanism:
- Under developing soil moisture deficits, drought-tolerant crop cultivars conserve internal water status primarily by down-regulating stomatal conductance.
- Closing stomata reduces transpiration water loss per unit leaf area, maintaining leaf relative water content (RWC) and turgor pressure. (Correct answer: Option 2)
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