Assertion: Biological concept of species is based on reproductive isolation.
Reason: Biological concept of species is universal.

Options

A. If both assertion and Reason are true and the reason is a correct explanation of the assertion.
B. If both Assertion and 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 and Reason are False.

Answer

To solve the assertion and reason question, we need to analyze both statements carefully.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that the biological concept of species is based on reproductive isolation. This is indeed true. The biological species concept, proposed by Ernst Mayr, defines a species as a group of organisms that can interbreed and produce fertile offspring. Reproductive isolation is a key factor that maintains the integrity of a species by preventing interbreeding with other species.

**Hint**: Think about how species are defined in terms of their ability to reproduce and the importance of barriers that prevent them from mating with other species.

2. **Understanding the Reason**:
- The reason states that the biological concept of species is universal. This statement is false. While the biological species concept applies well to many organisms, it does not universally apply to all, especially in cases like prokaryotes (bacteria), which reproduce asexually and do not have reproductive isolation in the same way that sexually reproducing organisms do.

**Hint**: Consider examples of organisms that reproduce differently and how that affects the applicability of the biological species concept.

3. **Conclusion**:
- Since the assertion is true and the reason is false, the correct answer is that the assertion is true but the reason is false.

### Final Answer:
- The correct option is: Assertion is true, but Reason is false.