Structure protecting archegonia of Marchantia is

Options

A. Apophysis
B. Perichaetium
C. Periphysis
D. Apophysis.

Answer

To answer the question regarding the structure that protects the archegonia of Marchantia, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Marchantia**:
- Marchantia is a genus of liverworts, which are non-vascular plants belonging to the group Bryophytes. They have distinct reproductive structures, including archegonia (female reproductive organs) and antheridia (male reproductive organs).

2. **Identifying Archegonia**:
- Archegonia are the structures that produce eggs in bryophytes. In Marchantia, these structures need protection to ensure the successful development of the gametes.

3. **Exploring Protective Structures**:
- In Marchantia, the archegonia are surrounded by protective structures. The question asks for the specific structure that provides this protection.

4. **Options Analysis**:
- The options given are:
a. Apophysis
b. Perichatium
c. Periphysis
d. Apophysis (repeated option)
- Among these, we need to identify which one is known to protect the archegonia.

5. **Correct Identification**:
- The protective structure for the archegonia in Marchantia is known as the **Perichatium**. This layer surrounds the archegonia, providing it with protection from environmental factors.

6. **Final Answer**:
- Therefore, the correct answer to the question is **b. Perichatium**.