PLANTS
PLANT RESPONSES TO STIMULI
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Auxin
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Cytokinins
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Abscisic Acid
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Ethylene
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Detailed explanation-1: -Abscisic acid (ABA) is an important phytohormone regulating plant growth, development, and stress responses.
Detailed explanation-2: -Abscisic acid (ABA) and cytokinin antagonistically regulate many developmental processes and environmental stress responses in plants.
Detailed explanation-3: -Abscisic acid (ABA) and ethylene are the major regulators of ripening and senescence in both dry and fleshy fruits, as demonstrated by numerous ripening-defective mutants, effects of exogenous hormone application, and transcriptome analyses.
Detailed explanation-4: -Abscisic acid content increases during stress and protects plant water status. The content of free auxin in the developing xylem of poplar declines during stress, while auxin conjugates increase. This indicates that specific down-regulation of a signal transduction chain is important in plant adaptation to stress.