Choose correct statements for plant growth regulators: (i) …

Biology Plant Growth and Development Statement Based Questions Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 14, 2026

Choose correct statements for plant growth regulators:

(i) The discovery of each of the five major groups of PGRs has been accidental.

(ii) Charles Darwin and his son Francis Darwin observed that the coleoptiles of canary grass shows phototropism.

(iii) Auxin was isolated by F.W. Went from tips of coleoptiles of oat seedlings.

(iv) Skoog and Miller identified and crystallized abscisic acid (ABA).

(v) Inhinitor-B, abscission II and dormin were chemically identical and named kinetin.

(vi) Release of ethylene from ripened oranges hastened the ripening of stored unripened bananas.

(i), (ii), (iii), (iv) and (vi)

(i), (ii), (iii) and (vi)

(ii), (iii), (iv), (v) and (vi)

(ii), (iii), (iv) and (vi)

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