A) daily phase cycle
B) circadian rhythms
C) biological clock
D) -photoperiodism
Correct Answer: D
Solution :
Phototropism is tropism in which stimulus is light, i.e., bending of plant towards light. Abscisic acid (ABA) is a growth inhibitor, which is involved in seed dormancy. Dormant seeds germinate when ABA is overcome by gibberellins. ABA cause dormancy in axillary buds and acts as stress hormone in adverse environmental conditions.
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