Question

Why is abscisic acid called a stress hormone

Answer 1

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Abscisic acid is called stress hormones as it induces various responses in plants against stress conditions. It increases the tolerance of plants toward various stresses. It induces the closure of the stomata during water stress. It promotes seed dormancy and ensures seed germination during favourable conditions.

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Answer 2

Answer:

• Abscisic acid is responsible to stimulate the closure of stomata in the epidermis and raises the tolerance of plants to different types of stresses, hence it is also called as stress hormone.
• Abscisic acid is responsible to promote seed dormancy thereby ensuring the germination of seeds during favorable conditions.
• This helps the seeds to withstand desiccation and to induce dormancy towards the end of the growing season in plants thereby promoting abscission of the fruits, leaves and flowers.