Answer:
a. Ethylene is
a hormone which is gaseous in nature.
b. Auxin (synthetic
auxin 2-4 D) is responsible for phototropism and geotropism in plants.
c. Ethylene
causes feminising effect. External supply of very small quantity of ethylene can
increase the number of female flowers and hence fruits as in cucumber.
d. Synthetic
auxin (2-4 D) kills broad leaved dicot weeds, hence used as weedicides.
e. Gibberellins,
induces flowering in long-day plants.
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