A population of plants experiences several years of severe drought. Much of the population dies due to lack of water, but a few individuals survive. You set out to discover the physiological basis for their adaptation to such an extreme environmental change. You hypothesize that the survivors have the ability to synthesize higher levels of _______ than their siblings do.
A. auxin
B. gibberellin
C. cytokinin
D. abscisic acid

Question

23-08-2022
Biology

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A population of plants experiences several years of severe drought. Much of the population dies due to lack of water, but a few individuals survive. You set out to discover the physiological basis for their adaptation to such an extreme environmental change. You hypothesize that the survivors have the ability to synthesize higher levels of _______ than their siblings do.
A. auxin
B. gibberellin
C. cytokinin
D. abscisic acid

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rafikiedu08 rafikiedu08 · Answer 1 · 2022-08-27T18:36:01+02:00

Hypothesize that the survivors have the ability to synthesize higher levels of abscisic acid than their siblings do.

Abscisic acid (ABA) is a hormone found in plants that controls a variety of processes related to development, growth, and stress responses. Reduced seed dormancy and wilty phenotypes are seen in ABA-deficient mutants from a variety of plant species, demonstrating the conservation of these essential ABA functions in the plant kingdom. Sesquiterpene (C15) ABA is produced by oxidative cleavage of carotenoids (C40). Numerous modifications, such as oxidation and conjugation, start the breakdown of ABA.

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