alleryStart learning →Low soil moisture raises the level of abscisic acid, which then does what?
AOpens the stomata and raises water loss
BCloses the stomata and lowers water loss
COpens the stomata and lowers water loss
DCloses the stomata and raises water loss
Answer & Solution
Correct answer: B. Closes the stomata and lowers water loss
1. Abscisic acid accumulates in response to stressful conditions such as dehydration, cold temperatures or shortened day lengths.
2. Low soil moisture raises its level in the plant.
3. The hormone then causes stomata to close, which reduces water loss.
4. Closing pores while losing more water is self contradictory, which rules out the fourth option.
5. The same hormone also inhibits stem elongation and induces dormancy in lateral buds, so its overall effect is to hold growth back under stress.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.6 Plant Sensory Systems and Responses_
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