A) auxin
B) cytokinins
C) gibberellins
D) ethylene
Correct Answer: C
Solution :
Plant growth regulator gibberellins (GAs) are responsible for elongation of stem leaf expansion, bolting, enzymeformation, parthenocarpy, etc. Their ability to cause increase in length of axis is used to make stalk of grapes lengthy, thereby allowing the grapes to grow larger and as certain better yield.
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