a) Zeatin
b) Indole-3 acetic acid
c) Abscisic acid
d) Ethylene
Answer: b) Indole-3 acetic acid
Explanation: Indole-3 acetic acid is an auxin used for hedge making in tea plantations. Auxin is a hormone that is synthesised in the apical buds and promotes apical dominance, and this leads to inhibition of the growth of lateral buds.
Indole 3 acetic acid, however, is used on tea plants as it promotes rooting and shooting.
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