Spiny leaves and photosynthetic stem are the features of :

Options

A. Opuntia
B. Citrus
C. Vallisneria
D. Hydrilla

Answer

To solve the question regarding which plant features spiny leaves and a photosynthetic stem, we can follow these steps:

### Step 1: Understand the Features
- **Spiny Leaves**: This adaptation is typically found in plants that live in dry environments (xerophytes) to reduce water loss.
- **Photosynthetic Stem**: In some plants, especially those in arid conditions, the stem takes over the role of photosynthesis when leaves are modified or reduced.

### Step 2: Analyze the Options
- **Opuntia**: Commonly known as cactus, it has spiny leaves (modified into spines) and a green stem that performs photosynthesis.
- **Citrus**: Generally has broad leaves and does not exhibit spiny leaves or a photosynthetic stem.
- **Ladisonaria**: Not a commonly known plant; further research may be needed, but it is unlikely to fit the description.
- **Hydrilla**: An aquatic plant that does not have spiny leaves or a photosynthetic stem.

### Step 3: Identify the Correct Answer
- Given the adaptations of the plants listed, **Opuntia** is the only one that possesses both spiny leaves and a photosynthetic stem, making it the correct answer.

### Conclusion
The correct answer to the question is **Opuntia**.

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