Polyplploidy can be produced artificially by

Options

A. colchicine
B. inbreeding
C. line breeding
D. self pollination

Answer

**Step-by-Step Solution:**

1. **Understanding Polyploidy**: Polyploidy refers to the condition of having more than two complete sets of chromosomes. It is an important phenomenon in plant breeding and can lead to increased size and vigor in plants.

2. **Identifying Artificial Methods of Inducing Polyploidy**: There are several methods to induce polyploidy artificially. The question asks for one specific method.

3. **Evaluating the Options**:
- **Colchicine**: This is a chemical compound that can disrupt the normal process of cell division (mitosis), leading to the doubling of chromosome numbers in plants. It is commonly used to induce polyploidy.
- **Inbreeding**: This refers to breeding between closely related individuals, which does not induce polyploidy.
- **Line Breeding**: This is a form of inbreeding that focuses on a specific lineage within a breed, which also does not induce polyploidy.
- **Self-Pollination**: This is the process where a flower's pollen fertilizes its own ovules, which does not lead to polyploidy.

4. **Conclusion**: Among the options provided, colchicine is the only substance that can artificially induce polyploidy in plants. Therefore, the correct answer is colchicine.

**Final Answer**: Polyploidy can be produced artificially by colchicine.

---