First slide

Plant Growth Regulators

Question

Which of the following physiological effects is caused in plants by gibberellic acid?

Easy

A

Shortening of genetically tall plants.
B

Elongation of genetically dwarf plants.
C

Rooting in stem cuttings.
D

Yellowing of young leaves.

Solution

Gibberellins promote internodal elongation in genetically dwarf plants like maize, Pisum, Vicia faba etc. Here only phenotype get change while genotype remains same.

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