Which one of the following is not true?

Medical

Biology

Growth Hormones and Auxin

Question

NAA are quite active auxins.

Trans-cinnamic acid is an antiauxin.

Cis-cinnamic acid is an antiauxin.

Phenyl acetic acid is a weak auxin.

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Phenylacetic acid is an active auxin. An active auxin results in the growth in length of stems and hypocotyl. It is also involved in the growth of plant organs such as the Avena coleoptile. Indole acetic acid and phenylacetic acid are the commonly found active auxins in plants. Thus, the correct answer is option A.