A) indole acetic acid
B) cytokinins
C) gibberellins
D) ethylene
Correct Answer: C
Solution :
Gibberellin promotes internodal elongation in a wide range of species. This intermodal elongation phenomenon is known as blotting. Gibberellin is a plant growth hormone, which was first time obtained from a fungus Gibberella fujikuroi (Fusarium moniliformi). Indole acetic acid is a natural auxin. Auxins control several kinds of plant growth processes like cell elongation, apical dominance, weed control, parthenocarpy etc. Cytokinins control cell division, cell enlargement and differentiation, delay in senescence etc. Ethylene is a gaseous hormone which stimulates transverse growth but retards the longitudinal one. It is a fruits ripening hormone.
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