In Opuntia, the stem is modified into

Options

A. Cladode
B. Phylloclade
C. Phyllode
D. Staminode

Answer

To answer the question "In Opuntia, the stem is modified into," we will analyze the options provided and determine which one is correct based on the characteristics of Opuntia.

### Step-by-Step Solution:

1. **Understanding Opuntia**:
- Opuntia, commonly known as prickly pear, is a genus of cacti. It is important to note that in cacti, the stem often takes on functions that are typically associated with leaves.

2. **Analyzing the Options**:
- **Cladode**: This term refers to a stem that is flattened and functions similarly to a leaf. Cladodes are typically found in some plants like asparagus.
- **Phylloclade**: This is a type of stem that is flattened and photosynthetic, resembling a leaf. In Opuntia, the stem is modified into a phylloclade, which is succulent and performs photosynthesis.
- **Phyllode**: This term refers to a flattened petiole that functions like a leaf. It is seen in some plants but not in Opuntia.
- **Staminode**: This refers to a sterile stamen that does not produce pollen. This is not relevant to the modification of stems.

3. **Identifying the Correct Answer**:
- Given the characteristics of Opuntia, where the stem is flattened, succulent, and performs photosynthesis, the correct modification is **phylloclade**.

4. **Conclusion**:
- Therefore, in Opuntia, the stem is modified into a **phylloclade**.

### Final Answer:
In Opuntia, the stem is modified into a **phylloclade**.