Home › ICAR JRF › Plant Sciences › Plant Form and Physiology › Low soil moisture raises the level of abscisic a…
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_
Related questions
Which defence compound of the cassava root becomes toxic only after a herbivore eats it?A tree exposed to constant strong wind shows which developmental response?Jasmonates elicit the synthesis of volatile compounds that attract which agents?In ripening fruit, ethylene stimulates which conversion?Gibberellins are described as a group of about how many closely related hormones?The effect of cytokinins was first reported after adding what to plant embryos in culture?Which is the only naturally occurring auxin that shows physiological activity?A tilted seedling redistributes indole acetic acid to its lower side. What happens in the