Weedicides are used to kill weeds in the field
so b is the correct answer

Answer:

Weedicides are chemical substances that are specifically designed to destroy or control the growth of weeds. Weeds are unwanted plants that compete with cultivated crops for nutrients, water, and sunlight. They can reduce crop yields and hinder agricultural productivity. Therefore, the use of weedicides is crucial in modern agriculture to ensure the growth and development of desired crops.

Why are weedicides used?
Weedicides are used to eliminate or suppress the growth of weeds for several reasons:

1. Reducing competition: Weeds compete with cultivated crops for essential resources such as nutrients, water, and sunlight. By using weedicides, farmers can control and minimize the competition, allowing the crops to receive the required resources for optimal growth.

2. Protecting crop yield: Weeds can significantly reduce crop yields by obstructing sunlight, absorbing nutrients, and depriving crops of essential resources. Weedicides help prevent this by ensuring that the crops receive the necessary nutrients and sunlight, which promotes healthy growth and higher yields.

3. Preventing weed spread: Weeds are highly adaptable and can spread rapidly, overtaking cultivated fields if left uncontrolled. Weedicides help prevent the spread of weeds by targeting their growth and inhibiting their ability to reproduce, ensuring that the cultivated crops remain weed-free.

4. Facilitating efficient farming practices: Weedicides can also assist in reducing the labor and time required for manual weed removal. By using weedicides, farmers can effectively manage weed growth, allowing them to focus on other essential farming tasks.

5. Environmental impact: Although weedicides are chemical substances, their application can be more environmentally friendly compared to other weed control methods. For example, excessive tilling or manual weeding can lead to soil erosion and disturbance of the natural ecosystem. Proper use of weedicides under regulated conditions can minimize these negative environmental impacts.

In conclusion, weedicides are specifically designed to control and eliminate weeds in agricultural settings. By using weedicides, farmers can effectively manage weed growth, reduce competition, protect crop yields, prevent weed spread, facilitate efficient farming practices, and minimize negative environmental impacts.