Incipient nucleus is present in

Options

A. Cyanophyceae
B. Rhodophyceae
C. Chlorophyceae
D. Pheophyceae

Answer

To solve the question regarding the presence of the incipient nucleus, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Term "Incipient Nucleus":**
- The term "incipient nucleus" refers to a structure that is not a true nucleus but serves a similar function. It is typically found in prokaryotic organisms, where the genetic material is not enclosed within a nuclear membrane.

2. **Identifying the Options:**
- The options provided are:
- A) Sinophysae
- B) Rhodophysae
- C) Chlorophysae
- D) Pheophysae

3. **Analyzing Each Option:**
- **A) Sinophysae:** This group, also known as cyanophyceae or blue-green algae, is characterized by the absence of a true nucleus. Instead, they have an incipient nucleus where the genetic material is present in the form of circular DNA in the cytoplasm.
- **B) Rhodophysae:** This group, known as red algae, has a true nucleus and is eukaryotic, thus does not possess an incipient nucleus.
- **C) Chlorophysae:** This group, known as green algae, also has a true nucleus and is eukaryotic, hence it does not have an incipient nucleus.
- **D) Pheophysae:** This group, known as brown algae, is also eukaryotic and contains a true nucleus.

4. **Conclusion:**
- Based on the analysis, the only group that contains an incipient nucleus is **Sinophysae**. Therefore, the correct answer is **A) Sinophysae**.

### Final Answer:
The incipient nucleus is present in **Sinophysae**.