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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. adventitius root
C. stem
D. leaf
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In Bougainvillea, thorns are the modifications of stem. They are stiff, sharp structures, which have lost their growing point and become hard. They reduce transpiration as well as browsing by animals.
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