The unit of inflorescence in grasses/gramineae (poaceae) is

Options

A. Thyrsis
B. Spike
C. spikelet
D. raceme

Answer

To determine the unit of inflorescence in grasses (family Poaceae), we can analyze the provided options step by step:

### Step-by-Step Solution:

1. **Understanding Inflorescence**: Inflorescence refers to the arrangement of flowers on a plant. In grasses, the structure and arrangement of flowers are crucial for identification.

2. **Analyzing the Options**:
- **Option A: Thyrse**: This is a mixed type of inflorescence characterized by a branched cluster of flowers. It is not specific to grasses.
- **Option B: Spike**: A spike is an inflorescence where flowers are attached directly to the main stem without any stalks. While spikes can be found in some grasses, they do not represent the unit of inflorescence in the Poaceae family.
- **Option C: Spikelet**: A spikelet is a small, compact structure that contains one or more flowers. In grasses, spikelets are the primary units of inflorescence and are typically borne on a rachis, surrounded by bracts.
- **Option D: Resin**: This term does not refer to a type of inflorescence but rather to a substance produced by some plants.

3. **Conclusion**: The correct answer is **Option C: Spikelet**. Spikelets are the fundamental units of inflorescence in grasses, making them essential for the identification and classification of grass species.

### Final Answer:
The unit of inflorescence in grasses (Poaceae) is **Spikelet**.