Weeds are controlled by using certain chemicals called :

Options

A. Weedicide
B. Winnowing
C. Sowing
D. None of these

Answer

**Step-by-Step Solution:**

1. **Understanding Weeds**: Weeds are defined as undesirable plants that grow in agricultural fields and can compete with crops for nutrients, light, and space. They can significantly reduce crop yield.

2. **Need for Weed Control**: Since weeds can harm crop production, it is essential to control their growth to ensure healthy crop yields.

3. **Chemical Control**: One effective method of controlling weeds is through the use of chemicals specifically designed for this purpose.

4. **Identifying the Chemicals**: The chemicals used to control weeds are called herbicides. However, in the context of the question, the term used is "widocytes," which is likely a typographical error or a mispronunciation of "herbicides."

5. **Options Analysis**: The options provided are:
- A) Widocytes
- B) Winnowing
- C) Swing
- D) None of these

6. **Correct Answer**: The correct answer is A) Widocytes, as it refers to the chemicals used to control weeds, despite the correct term being herbicides.

**Final Answer**: Weeds are controlled by using certain chemicals called **widocytes**.

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