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In Bougainvillea thorns are the modifications of:

1. Adventitious root
2. Stem
3. Leaf
4. Stipules

Correct answer: Stem

Solution

In Bougainvillea, the thorn is a modified stem, specifically an axillary branch that becomes woody and pointed for protection. This is different from spines or prickles, which come from leaves or epidermal tissues.

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