The gaseous plant growth regulator is used in plants to :

(A)speed up the malting process
(B)promote root growth and roothair formation to increase the absorption surface
(C)help overcome apical dominance
(D)kill dicotyledonous weeds in the fields

The NCERT line that answers it

Verbatim line

Ethylene also promotes root growth and root hair formation, thus helping the plants to increase their absorption surface.

Chapter: Plant Growth and Development
Section: 13.4.3 Physiological Effects of Plant Growth Regulators
Page: 11
Words matched: 18 of 18

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states 'Ethylene also promotes root growth and root hair formation, thus helping the plants to increase their absorption surface,' which directly matches option B's claim about a gaseous plant growth regulator promoting root growth and root hair formation to increase absorption surface.

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