Calyptra around the sporophyte of a bryophyte is derived from

Options

A. Columella
B. Antheridium
C. Archegonium
D. Capsule.

Answer

To solve the question "Calyptra around the sporophyte of a bryophyte is derived from?", we will analyze the options provided and understand the relevant biological concepts.

### Step-by-Step Solution:

1. **Understand the Sporophyte**:
- The sporophyte in bryophytes is the diploid phase of the plant life cycle. It is formed after fertilization and contains two sets of chromosomes.

2. **Identify Bryophytes**:
- Bryophytes are non-vascular plants, which include mosses, liverworts, and hornworts. They do not have differentiated roots, stems, or leaves.

3. **Define Calyptra**:
- Calyptra is a protective covering that surrounds the sporophyte in bryophytes. It plays a role in protecting the developing sporophyte.

4. **Analyze the Options**:
- **Columella**: This is a structure found within the capsule of the sporophyte, but it does not give rise to the calyptra. Therefore, this option is incorrect.
- **Antheridium**: This is the male reproductive structure of bryophytes, which produces sperm. It does not contribute to the formation of the calyptra. Thus, this option is also incorrect.
- **Archegonium**: This is the female reproductive structure that produces eggs. The calyptra is derived from the archegonium, making this option correct.
- **Capsule**: This is part of the sporophyte that contains spores, but it does not develop into the calyptra. Hence, this option is incorrect.

5. **Conclusion**:
- The calyptra around the sporophyte of a bryophyte is derived from the archegonium. Therefore, the correct answer is **option 3: Archegonium**.

### Final Answer:
The calyptra around the sporophyte of a bryophyte is derived from **Archegonium**.

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