Explant is

Options

A. Propagule
B. Callus used for subculturing
C. part of plant used in tissue culture
D. Part of tissue culture used for planting

Answer

### Step-by-Step Solution:

1. **Understanding the Term "Explant":**
- An explant refers to a piece of plant tissue that is removed from its original location and used for further culture or experimentation.

2. **Identifying the Options:**
- A. Propagule: This typically refers to a structure that can give rise to a new plant, such as seeds or bulbs.
- B. Callus used for subculturing: Callus is a mass of unorganized plant cells that can arise from explants, but it is not the explant itself.
- C. Part of plant used in tissue culture: This option suggests that an explant is a part of the plant that is utilized in tissue culture processes.
- D. Part of tissue culture used for planting: This option is misleading as it implies that the explant is a component of the tissue culture process rather than the source material.

3. **Analyzing the Correct Definition:**
- The explant is specifically the part of the plant that is used to initiate tissue culture. This can include various parts such as shoots, leaves, or roots.

4. **Conclusion:**
- Based on the definitions and analysis, the correct answer to the question "Explant is" is **C. Part of plant used in tissue culture.**