Leaves are modified into spines in

Options

A. Nepenthes
B. Australian Acacia
C. Opuntia
D. Utricularia

Answer

### Step-by-Step Solution

1. **Understanding the Question**: The question asks which plant has leaves that are modified into spines. This indicates a specific adaptation in certain plants.

2. **Identifying the Options**: The options provided are:
- Option 1: Nepenthes
- Option 2: Australian Acacia
- Option 3: Opuntia
- Option 4: Atricularia

3. **Analyzing Each Option**:
- **Nepenthes**: This plant is known for its modified leaves that form pitcher shapes, which are used to trap insects. Therefore, this option is incorrect.
- **Australian Acacia**: In this plant, the leaves are modified into phyllodes, which are flattened petioles that perform photosynthesis. This option is also incorrect.
- **Opuntia**: This is a genus of cacti where the leaves are modified into spines. This adaptation helps reduce water loss and provides protection against herbivores. This option is correct.
- **Atricularia**: This is an aquatic plant where leaves can be modified into bladders for trapping prey. This option is incorrect.

4. **Conclusion**: Based on the analysis, the correct answer is **Option 3: Opuntia**. This plant exhibits the modification of leaves into spines, which is an adaptation to its xerophytic (dry) environment.