Home Biology Plant Growth and Development Previous Year Questions The gaseous plant growth regulator is used i…
Biology Plant Growth and Development Previous Year Questions Single Correct MCQ
Published on: August 21, 2026

The gaseous plant growth regulator is used in plants to

A
Kill dicotyledonous weeds in the fields
B
Speed up the malting process
C
Promote root growth and root hair formation to increase the absorption surface
D
Help overcome apical dominance

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The correct answer is:

                    

Auxins are widely used as herbicides and therefore can kill dicotyledonous weeds in the fields.

Gibberellic acid is used to speed up the malting process in brewing industry.
Cytokinins help overcome the apical dominance.
Ethylene promotes root growth and root hair formation, thus helping the plants to increase their absorption surface.

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