Which PGR could fit either growth promoting or inhibiting group?

Which PGR could fit either growth promoting or inhibiting group?
  1. Gibberellic acid
  2. Kinetin
  3. Ethylene
  4. Indole-3-acetic acid

Solution

Ethylene is a gaseous PGR that could fit either of the groups, but it is largely an inhibitor of growth activities.

Asked in: NCERT

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