What morphological adaptation enables xerophytic plants like cacti and Euphorbia to survive in arid desert environments?
Answer and explanation
Correct answer: A. reduction of leaves into protective spines and presence of thick sunken stomatal cuticles
- Step 1: Xerophytes conserve water by minimizing transpiration. Step 2. They reduce leaves to spines (minimizing surface area), feature thick waxy cuticles, possess sunken stomata, and store water in succulent stems. Answer: reduction of leaves into protective spines and presence of thick sunken stomatal cuticles. Why not the others: Broad leaves and exposed stomata occur in mesophytes/hydrophytes; xerophytes have extensive deep roots; midday transpiration is minimized.
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