HUMAN PHYSIOLOGY
CONTROL AND COORDINATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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dormancy and cotyledons
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dormancy and germination
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auxin and cytokins
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auxins and ethylene
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Detailed explanation-1: -These results suggest that auxin and cytokinin exert opposite effects on amyloplast development by regulating the expression of the genes required for starch biosynthesis.
Detailed explanation-2: -Cytokinins act in concert with auxin, another plant growth hormone. The two are complementary, having generally opposite effects.
Detailed explanation-3: -ANSWER: The abscisic acid is the hormone which acts opposite to auxins, gibberellins and cytokinins.
Detailed explanation-4: -At a cellular level, abscisic acid inhibits both cell division and cell expansion. It often opposes the growth-inducing effects of auxin and gibberellic acid.
Detailed explanation-5: -The plant hormone that retards senescence in plants and delays ageing is known as cytokinin or kinetin.