Branched veins with flowing protoplasm occur in

Options

A. Acellular Slime Moulds
B. Cellular Slime Moulds
C. Polysiphonia
D. Ulva.

Answer

To solve the question "Branched veins with flowing protoplasm occur in," we need to analyze the options provided: Acellular slime molds, Cellular slime molds, Polysiphonia, and Ulva. Let's break down the solution step by step.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- First, we need to understand what is meant by "branched veins with flowing protoplasm." This description is indicative of a specific structure found in certain organisms.

2. **Identifying Slime Molds**:
- Slime molds are a type of organism that falls under the kingdom Protista. They are eukaryotic and can be classified into two main types: acellular (plasmodial) slime molds and cellular slime molds.

3. **Characteristics of Cellular Slime Molds**:
- Cellular slime molds consist of individual cells that aggregate under certain conditions. They do not have flowing protoplasm or branched structures like the acellular slime molds.

4. **Characteristics of Acellular Slime Molds**:
- Acellular slime molds, on the other hand, have a multinucleated structure known as plasmodium. This structure can exhibit flowing protoplasm and can form branched structures as it moves.

5. **Evaluating Other Options**:
- **Polysiphonia**: This is a type of red algae and does not exhibit the characteristics of branched veins with flowing protoplasm.
- **Ulva**: Also known as sea lettuce, it is a green algae and does not fit the description either.

6. **Conclusion**:
- Based on the characteristics discussed, the correct answer to the question is **Acellular slime molds**, as they are the only ones that exhibit branched veins with flowing protoplasm.

### Final Answer:
Branched veins with flowing protoplasm occur in **Acellular slime molds**.