A) Apical dominance
B) Parthenocarpy
C) Tropic movements
D) Bolting
Correct Answer: D
Solution :
By gibberellic acid treatment the rosette habit can be changed to vine habit. This is due to the excessive elongation of internodes. (bolting effect). In vascular plants the apical bud suppress the growth of lateral or axillary buds. This is called as apical dominance. It is caused by IAA. Auxins induce parthenocarpy in a number of plants eg, tomatoes, apples, cucumber, etc. FW Went isolated a substance from the coleoptile tip of Avena sativa, which is capable of promoting the cell elongation, phototropic curvature and growth.
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