In Bougainvillea, thorns are the modifications of

Options

A. Stipules
B. Adventitious root
C. Stem
D. Leaf

Explanation

To solve the question "In Bougainvillea, thorns are the modifications of," we can follow these steps:

### Step 1: Understand Plant Morphology
- In plant morphology, different parts of a plant can undergo modifications to serve specific functions. These modifications can occur in leaves, stems, or roots.

### Step 2: Identify Types of Modifications
- The question mentions thorns, which are one of the modifications seen in plants. Other similar structures include spines and prickles.
- Thorns, spines, and prickles are all hard structures that serve a protective function against herbivores.
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