A) Apical dominance
B) Parthenocarpy
C) Tropic movements
D) Bolting
Correct Answer: D
Solution :
Bolting is not influenced by auxin. By gibberellic acid treatment the rosette habit can be changed to vine habit. This is due to the excessive elongation of intemodes (bolting effect). In vascular plants the apical bud supresses the growth of lateral or axillary buds. This is called as apical dominance. It is caused by IAA. Auxins also 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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