Xerophytic adaptations minimize transpiration

Steps:

• Thick cuticle on upper surface prevents water vapor escape from the leaf's main evaporative surface.
• Sunken stomata on lower surface create a humid microenvironment, reducing diffusion gradient for water loss.
• Curled leaf edges trap moist air and shield stomata from dry winds, further limiting transpiration.
• Collectively, these features conserve water in arid conditions without severely impacting gas exchange.

Why B is correct:

• These traits reduce transpiration rate by creating barriers and microclimates that lower water evaporation, a key xerophyte strategy for survival in dry habitats.

Why the others are wrong:

• A: Features enhance CO2 access via stomata while minimizing water loss, not decreasing uptake.
• C: While CO2 uptake is maintained, primary goal is water conservation, not maximization.
• D: All features oppose increased water loss by restricting evaporation.

Final answer: B