Axis of the spikelet is known as

Options

A. Rachilla
B. Pedicel
C. Appendage
D. Rachis

Answer

### Step-by-Step Solution:

1. **Understanding Spikelet Inflorescence**:
- A spikelet is a type of inflorescence that consists of a small cluster of flowers, typically found in grasses. It is characterized by its structure, which includes a pair of small, sterile bracts at the base.

2. **Identifying Key Components**:
- The spikelet consists of a basal pair of minute sterile bracts known as glooms. These bracts serve to protect the flowers, which can be either male or female.

3. **Arrangement of Flowers**:
- The flowers (or florets) in a spikelet are arranged in a zigzag manner along the spikelet axis. This unique arrangement is a defining feature of the spikelet.

4. **Defining the Spikelet Axis**:
- The axis of the spikelet is the central stem-like structure that supports the florets and bracts.

5. **Identifying the Correct Term**:
- The question asks for the name of the axis of the spikelet. Based on the information gathered, the correct term for the axis of the spikelet is "rachisilla."

6. **Conclusion**:
- Therefore, the answer to the question "Axis of the spikelet is known as" is **Option A: Rachisilla**.