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ABA (Abscisic Acid) is called a stress h...

ABA (Abscisic Acid) is called a stress hormone.
A. How this hormone overcome stress conditions ?
B. From where where does this hormone get released in leaves ?

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(a) ABA leads to closure of stomata thereby enhancing the tolerance of plants for stress. It also induces dormancy in buds and seeds.
(b) ABA is formed in chloroplasts of leaves from violaxanthin (a type of xanthophyll).
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