Acetabularia (Umbrella plant ) is 10 cm long, single celled marine green alga and

Options

A. binucleated
B. multinucleated
C. coenocytic
D. uninucleated

Answer

### Step-by-Step Solution:

1. **Understanding Acetabularia**:
- Acetabularia is a type of marine green alga that is known for its unique structure and size. It can grow up to 10 cm long and is classified as a single-celled organism.

2. **Cell Structure**:
- Being a single-celled organism means that Acetabularia consists of only one cell. This is an important characteristic that influences its classification regarding the number of nuclei it possesses.

3. **Nucleus Count**:
- The question asks about the number of nuclei present in Acetabularia. The options provided are: binucleated (two nuclei), multinucleated (more than one nucleus), quinucytic (five nuclei), and uninucleated (one nucleus).

4. **Determining the Correct Option**:
- Since Acetabularia is a single-celled organism, it can only have one nucleus. Therefore, it is classified as uninucleated.

5. **Conclusion**:
- The correct answer is that Acetabularia is **uninucleated** (Option 4).