Question

Exogenous application of auxin fails to enhance the growth of intact plants.
Give reason..

Class 11 ( Bio)

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Answer 1

The exogenous auxin fails to enhance the growth of intact plants because these plants synthesise sufficient amount of endogenous auxins and do not require more to promote growth. ... When these shoot tips are removed, then only exogenous auxins work and promote growth as endogenous auxin production reduces.

Answer 2

Auxin fails to cause growth of intact plants because the required amount of auxin is already present in such plants and they do not need external supply of auxins.