Which auxins are synthetic?

Which auxins are synthetic?
  1. IAA and IBA
  2. NAA and 2, 4-D
  3. IBA and 2, 4-D
  4. IAA and NAA

Solution

NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic) are synthetic auxins.

Asked in: NCERT

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