Excess use of herbicides or pesticides has resulted in selection of …………X……… varienties in a much lesser timescale and is a result of ………..Y……….. .
Select the correct option for X and Y.

Options

A. X - resistant , Y - natural selection
B. X - mutant , Y - genetic drift
C. X - resistant , Y - anthropogenic action
D. both (a) and (c )

Answer

To solve the question, we need to identify the correct terms to fill in the blanks X and Y based on the context provided.

1. **Understanding the Question**: The question states that the excess use of herbicides or pesticides has led to the selection of certain varieties in a shorter timescale, which is a result of a specific cause. We need to determine what these varieties are (X) and what the cause is (Y).

2. **Analyzing the Context**: The video transcript mentions that the excessive use of pesticides, specifically DDT, has led to the development of resistant varieties of insects. This indicates that the organisms have adapted to survive despite the presence of these chemicals.

3. **Identifying X**: Based on the information provided, the correct term for X would be "resistant species" or "resistant varieties." This is because the organisms that survive the pesticide treatment are those that have developed resistance.

4. **Identifying Y**: The transcript indicates that the cause of this selection is due to "anthropogenic action," which refers to human activities that impact the environment, in this case, the excessive use of pesticides and herbicides.

5. **Final Answer**: Therefore, the correct options for X and Y are:
- X: resistant species
- Y: due to anthropogenic action

### Summary:
- **X**: Resistant species
- **Y**: Due to anthropogenic action