In Bougainvillea thorns are the modifications of :

1. Adventitious root

2. Stem

3. Leaf

4. Stipules

Doubtly Asked 30 Oct 2026 NEET UG 2017 Practice test neet Save WhatsApp Report

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Answer: 2. Stem

The thorns of Bougainvillea are modified stems (axillary buds changed into hard, pointed thorns). They protect the plant from browsing animals.

Their origin from axillary buds shows they are stem structures. Thorns of other plants like Citrus are also stem modifications.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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