Assertion: Thallophytes are non-vascular, non-archegoniate, and non-cormophytic plants.
Reason: Thallophytes lack vascular bundles, archegonia, and differentiated plant body.

Options

A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B. If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.
C. If Assertion is true, but Reason is false.
D. If both Assertion and Reason are false.

Answer

### Step-by-Step Solution:

1. **Understanding Thallophytes**:
- Thallophytes are a group of plants that do not have true roots, stems, or leaves. They are characterized by a thallus, which is a simple, undifferentiated body structure.

2. **Assertion Analysis**:
- The assertion states that thallophytes are non-vascular, non-archegoniate, and non-cormophytic plants.
- Non-vascular means they do not have vascular tissues (xylem and phloem) that are responsible for the transport of water and nutrients.
- Non-archegoniate indicates that they do not possess archegonia, which are the female reproductive structures found in some plants.
- Non-cormophytic means they do not have a differentiated plant body with true stems, leaves, and roots.

3. **Reason Analysis**:
- The reason states that thallophytes lack vascular bundles, archegonia, and a differentiated plant body.
- This aligns with the characteristics of thallophytes, confirming that they do not have vascular tissues, do not produce archegonia, and their body is not differentiated into specialized structures.

4. **Conclusion**:
- Both the assertion and the reason are true statements about thallophytes.
- The reason provided accurately explains the assertion, as it details the characteristics that define thallophytes.

5. **Final Decision**:
- Since both the assertion and reason are true and the reason explains the assertion, the correct choice is that both the assertion and reason are true, and the reason is the correct explanation of the assertion.