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The presence of a thick waxy layer of cutin on the leaves of desert plants is an adaptation to prevent which biological process?

Answer and explanation

Correct answer: Water loss through excessive transpiration

Correct answer: B, water loss through excessive transpiration. Desert plants live where water is scarce and evaporation can be rapid. The leaf epidermis is covered by a cuticle containing cutin, a waxy, water-resistant substance. This layer reduces the escape of water vapour directly through the epidermal surface, which is called cuticular water loss. Stomata may still allow gas exchange and transpiration, but their opening can be regulated. A is wrong because the cuticle does not normally stop photosynthesis; light and carbon dioxide can still reach photosynthetic tissues. C is wrong because minerals are absorbed mainly by roots from the soil, not through the leaf cuticle. D is wrong because cell division is controlled by cellular growth processes and is not the function being prevented here. Memory cue: cutin is a protective “water coat”; thick cutin means less water loss in dry habitats.

Related tags

CutinLeaf AdaptationTranspirationDesert PlantsLeavesMorphology Of Flowering PlantsBiologyClass 11 Mcq

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