If sperms of moss and fern are put together near the archegonium of fern, only the sperms of fern find entry into archeogonium, the reason being that

Options

A. sperms of moss are killed by larger sperms of fern
B. archegonia of fern secretes a toxoid to kill moss of fern.
C. archegonia of fern secrete mucilage rich in malic acid to attract sperms of fern only
D. sperms of moss are less motile and find difficulty in entering archegonium.

Answer

To answer the question, "If sperms of moss and fern are put together near the archegonium of fern, only the sperms of fern find entry into archegonium, the reason being that," we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding the Structures**:
- The archegonium is the female reproductive structure in ferns that produces eggs.
- Both mosses and ferns produce sperm, but they have different reproductive strategies.

2. **Sperm Characteristics**:
- The sperm of both mosses and ferns are motile and biflagellate, meaning they have two flagella that aid in movement.

3. **Role of Archegonium**:
- The archegonium of the fern plays a crucial role in attracting the appropriate sperm for fertilization.

4. **Secretion of Malic Acid**:
- The archegonium of the fern secretes a mucilage that is rich in malic acid. This substance is specifically designed to attract the sperm of the fern.

5. **Attraction Mechanism**:
- The mucilage rich in malic acid serves as a chemical attractant, guiding the fern's sperm towards the archegonium. This selective attraction is why only the sperm of the fern can enter the archegonium.

6. **Conclusion**:
- The reason that only the sperm of the fern finds entry into the archegonium is due to the secretion of mucilage rich in malic acid by the archegonium, which specifically attracts fern sperm.

### Final Answer:
The correct reason is that the archegonium of the fern secretes a mucilage rich in malic acid to attract only the sperm of the fern.

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