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Solution


Q.

Leaves become modified into spines in                      [2015]
1 onion  
2 silk cotton  
3 Opuntia  
4 pea  

Ans.

(3)

In xerophytic plants, the leaves modify into sharp, pointed spines, e.g., Solanum suratense, Opuntia, Asparagus, etc. This modification is either for protection of the plant or to lessen transpiration, or for both.