A) Auxin
B) Cytokinin
C) Both (a) and (b)
D) Abscisic acid
Correct Answer: D
Solution :
Abscisic acid is an inhibitory hormone present in buds, leaves, seeds etc. It induces senescence and abscission of leaves and dormancy in seeds and buds. IAA (Indole Acetic Acid) is a naturally occurring auxin hormone. It suppresses the growth of lateral buds and plays a key role in the stem elongation, binding of the shoot towards the light side. Cytokinins stimulate cells division and delay senescence by mobilizing foods from leaf parts.
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