Abscisic acid (ABA) plays an important role during drought conditions in Caribbean plants. Which of the following best describes its main function?

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Question

Abscisic acid (ABA) plays an important role during drought conditions in Caribbean plants. Which of the following best describes its main function?

Accepted Answer

It causes stomata to close, reducing water loss by transpiration — Abscisic acid is often called the 'stress hormone.' During drought, ABA levels rise in leaves and trigger guard cells to lose water by osmosis, causing stomata to close. This dramatically reduces water loss through transpiration, helping the plant survive dry conditions common in parts of the Caribbean. The other options describe the effects of gibberellins, auxins, or the opposite action of ABA on stomata.

Answer

It causes stomata to close, reducing water loss by transpiration

Answer

It promotes rapid shoot elongation to access more sunlight

Answer

It stimulates the opening of stomata to increase gas exchange

Answer

It accelerates seed germination to establish plants before drought

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