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Which main biological factor distinguishes transpiration in plants from physical evaporation?

Answer and explanation

Correct answer: Opening and closing of stomata

Correct answer: B. Transpiration is the loss of water vapour from living plant surfaces, especially leaves. Most exchange occurs through stomata, tiny pores controlled by guard cells. When stomata open, carbon dioxide can enter for photosynthesis and water vapour can leave; when they close, water loss is generally reduced. This biological regulation distinguishes transpiration from evaporation from a non-living water surface, although both processes are affected by temperature, humidity, wind, and light. A is wrong because sunlight influences conditions but is not the controlling pore mechanism. C describes a physical factor, not a plant structure. D affects both processes but is not uniquely biological. Memory cue: transpiration has a plant-controlled doorway—the stoma.

Related tags

TranspirationStomataPlant PhysiologyHydrological CycleThe Living WorldBiologyClass 11 Mcq

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