HORTICULTURE SCIENCE
PLANT BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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How does abscisic acid impact the function of guard cells?
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It activates the opening of stomata when soil water is insufficient to keep up with transpiration
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It initiates the openeing of stomata when relative humidity is high and wind sppeds are low
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It stimulates the closing of the stomata when soil water is readily available but emperatures are high
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It triggers the closing of the stomata when soil water is insufficient to keep up with transpiration
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Explanation:
Detailed explanation-1: -Abstract. Abscisic acid (ABA) is a plant hormone involved in the response of plants to reduced water availability. Reduction of guard cell turgor by ABA diminishes the aperture of the stomatal pore and thereby contributes to the ability of the plant to conserve water during periods of drought.
Detailed explanation-2: -Abscisic acid (ABA) is a stress hormone that accumulates under different abiotic and biotic stresses. A typical effect of ABA on leaves is to reduce transpirational water loss by closing stomata and parallelly defend against microbes by restricting their entry through stomatal pores.
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