Rachis is modified into a leafy structure called

Options

A. Phyllode
B. Ochrea
C. Phylloclade
D. Phyllome.

Answer

### Step-by-Step Solution:

1. **Understanding the Term "Rachis":**
- The rachis is the central stem of a compound leaf that holds the leaflets together. It can also refer to the main axis of a flower cluster.

2. **Identifying Modifications of Rachis:**
- The question asks about the modification of the rachis into a leafy structure. We need to identify the correct term that describes this modification.

3. **Evaluating the Options:**
- **Option A: Phyllode** - This is a modification of the rachis that takes on a leaf-like appearance and is capable of photosynthesis.
- **Option B: Ocrea** - This refers to a sheath around the stem, not a modification of the rachis.
- **Option C: Phylloclade** - This is a modification of the stem, not the rachis, although it can also perform photosynthesis.
- **Option D: Phyllome** - This term refers to any part derived from the leaf but does not specifically indicate a modification of the rachis.

4. **Choosing the Correct Answer:**
- Based on the definitions and functions of the terms, the correct answer is **Option A: Phyllode**. The rachis modified into a phyllode can perform photosynthesis, similar to a leaf.

5. **Conclusion:**
- Therefore, the final answer is that the rachis is modified into a leafy structure called a **phyllode**.