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Which is the most important living biological component that regulates transpiration in plants?

Answer and explanation

Correct answer: Movement and regulation of stomata

The correct answer is B, movement and regulation of stomata. Transpiration is the loss of water vapour, mainly through tiny pores called stomata on leaves. Each stoma is controlled by guard cells. When guard cells become turgid, the pore generally opens and water vapour escapes more readily; when they lose turgor, the pore closes and water loss decreases. Thus, stomatal opening and closing provide the most direct biological regulation of transpiration. A, root length, can influence water uptake but does not directly open or close the pores. C, stem diameter may affect transport and storage, but it is not the immediate regulator of vapour loss. D, leaf colour mainly relates to pigments and light absorption, not direct control of stomatal aperture. Memory cue: stomata are the adjustable gates of a leaf.

Related tags

StomataTranspirationGuard CellsHydrological CycleThe Living WorldBiologyClass 11 Mcq

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