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In Bougainvillea thorns are the modifications of 

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In Bougainvillea thorns are the modifications of 

(A) Stipules 

(B) Adventitious root 

(C) Stem 

(D) Leaf

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The correct answer is (C) Stem

Thom is a hard, pointed, woody and usually straight structure produced by modification of axillary bud. It provides protection against browsing animals. In Bougainvillea, thorns are modified stems.

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