Plant Growth and Development Question 4
4. Opening of floral buds into flowers, is a type of
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(a) autonomic movement of variation
(b) paratonic movement of growth
(c) autonomic movement of growth
(d) autonomic movement of locomotion.
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Answer : c
Hints & Solutions
(c) Opening of floral buds into flowers, is a type of autonomic movement of growth which is due to epinasty. Epinasty is caused by ethylene that is released by the leaves when the roots are flooded. Flooded roots make ACC, the precursor to ethylene, and this is transported up the xylem stream to the leaf where it is converted to the gas hormone.
