In Opuntia, stem is flat, leaf like and photosynthetic

Explanation

### Step-by-Step Solution:

1. **Understanding the Plant Structure**:
- Opuntia, commonly known as prickly pear, is a type of cactus. Its stem is modified to be flat and leaf-like.

2. **Adaptation to Environment**:
- Opuntia thrives in arid or desert conditions where water is scarce. The flat, leaf-like structure of the stem helps the plant adapt to these dry environments.

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