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Solution


Q.

The gaseous plant growth regulator is used in plants to                   [2022]
1 speed up the malting process  
2 promote root growth and root hair formation to increase the absorption surface  
3 help overcome apical dominance  
4 kill dicotyledonous weeds in the fields.  

Ans.

(2)

Ethylene is a gaseous plant growth regulator that promotes root growth and root hair formation, thus helping the plants to increase the absorption surface. Gibberellic acid (GA3) is used to speed up the malting process in the brewing industry. Cytokinin helps to overcome apical dominance. Auxin kills dicotyledonous weeds in the field.