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Answer» Ethylene
(i) Inhibition of stem elongation,
(ii) Stimulation of radial swelling of stems and
(iii) Horizontal growth of stems with respect to gravity (i.e., diageotropism)
iv)ONE of the most pronounced effects of ethylene is in RIPENING of fruits and therefore, ethylene is also known as fruit ripening hormone.
v)The plumular HOOK formation and its maintenance in ETIOLATED (dark grown) seedling are due to formation of ethylene in that region which causes asymmetric or unequal growth on the two sides of plumular tip
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