Fundamentholfundamenthol
NEET2022Biology
Q.

The gaseous plant growth regulator is used in plants to :

  1. A

    speed up the malting process

  2. B

    promote root growth and root hair formation to increase the absorption surface

  3. C

    help overcome apical dominance

  4. D

    kill dicotyledonous weeds in the fields

Solution

Ethylene is the only gaseous plant growth regulator. Among its many roles, ethylene promotes root growth and the formation of root hairs, thereby enlarging the absorptive surface area of the root system.

Malting is associated with gibberellins, removal of apical dominance involves cytokinins, and selective herbicides like 2,4-D (an auxin analogue) are used to kill dicot weeds.

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