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Solution


Q.

Fruit and leaf drop at early stages can be prevented by the application of                      [2017]
1 ethylene  
2 auxins  
3 gibberellic acid  
4 cytokinins  

Ans.

(2)

In low concentrations, auxins such as 2,4-D (2,4-Dichlorophenoxy acetic acid) are useful in preventing pre-harvest fruit drop and leaf drop.