An explantis

Options

A. Dead plant
B. Part of the plant
C. Part of the plant used in tissue culture
D. Part of the plant that expresses a specific gene

Answer

**Step-by-Step Solution:**

1. **Understanding the Term "Explant":**
- An explant is a part of a plant that is used in tissue culture techniques to grow a new plant.

2. **Identifying the Characteristics of Explants:**
- Explants must be living tissues. If the plant part is dead, it cannot grow or regenerate into a new plant.

3. **Tissue Culture Technique:**
- The tissue culture technique involves growing the explant under sterile conditions, which means that the environment is free from pathogens and contaminants. This is typically done in a laboratory setting.

4. **Nutrient Medium:**
- The explants are placed in a nutrient medium that provides all the necessary nutrients for growth. This medium supports the growth and development of the explant into a whole plant.

5. **Totipotency:**
- The ability of the explant to regenerate into a whole plant is referred to as totipotency. This means that a single cell or a small part of the plant can develop into a complete plant.

6. **Conclusion:**
- Based on the above understanding, the correct definition of an explant is that it is a part of the plant used in tissue culture.

**Final Answer:**
- The correct option is: "Part of the plant used in tissue culture."

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