Siphuncle of nautilus

Options

A. Connects all chambers with living animal
B. Fills all chambers with gas
C. Both A and B
D. Inflicts injury over intruder

Answer

### Step-by-Step Text Solution:

1. **Introduction to Nautilus**:
- Nautilus is a marine organism that belongs to the phylum Mollusca and the class Cephalopoda. It is characterized by its coiled shell.

2. **Structure of Nautilus**:
- Inside the shell of Nautilus, there is a living tube known as the siphuncle. This tube runs through all the chambers of the shell.

3. **Function of the Siphuncle**:
- The primary function of the siphuncle is to connect all the chambers of the Nautilus shell with the living animal.
- It plays a crucial role in buoyancy by removing water from newly formed chambers and replacing it with gas (air).

4. **Buoyancy and Free Floating**:
- By filling the chambers with gas, the siphuncle helps the Nautilus achieve buoyancy, allowing it to float and swim freely in the water.

5. **Conclusion**:
- Therefore, the siphuncle serves two main functions: connecting all chambers with the living animal and filling those chambers with gas.
- The correct answer to the question about the siphuncle of Nautilus is that it performs both functions: connecting the chambers and filling them with gas.