Assertion :- The protozoans are belived to be primitive relatives of animals.
Reason :- Protozoans are heterotrophs and live as predators or parasites.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are false.

Answer

To analyze the assertion and reason provided in the question, we can break it down into steps:

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "The protozoans are believed to be primitive relatives of animals."
- This is based on the idea that protozoans exhibit characteristics that are similar to those of early animal forms, such as a cellular level of organization.

2. **Understanding the Reason**:
- The reason states that "Protozoans are heterotrophs and live as predators or parasites."
- This indicates that protozoans obtain their food from other organisms, either by predation or by living as parasites.

3. **Linking Assertion and Reason**:
- The assertion is supported by the reason because the characteristics of protozoans (being heterotrophic and often living as predators or parasites) align with the idea that they are primitive forms of life that share traits with animals.
- The cellular organization and feeding habits of protozoans provide insight into the evolutionary link between protozoans and more complex animals.

4. **Evaluating the Options**:
- Based on the analysis, we can evaluate the options:
- **Option 1**: Both assertion and reason are true, and the reason is the correct explanation of the assertion. This is correct.
- **Option 2**: Both assertion and reason are true, but the reason is not the correct explanation of the assertion. This is incorrect.
- **Option 3**: Assertion is true, but reason is false. This is incorrect.
- **Option 4**: Both assertion and reason are false. This is incorrect.

5. **Conclusion**:
- The correct answer is **Option 1**: Both assertion and reason are true, and the reason is the correct explanation of the assertion.