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Solution


Q.

 Surface area of roots by promoting roots growth and root hair formation is increased by
 a) Cytokinin                    b) Kinetin                     c) Ethylene                   d)    ABA
1 A
2 B
3 C
4 D

Ans.

(c) Ethylene promotes root growth and root hair formation. Thus, they help the plants to increase its absorption surface by increasing the surface area.