Which one of the following is NOT a plant-like protist?

Options

A. Desmid
B. Dinoflagellate
C. Diatom
D. Slime mould

Answer

To determine which of the following options is NOT a plant-like protist, we will analyze each option based on their characteristics.

### Step-by-Step Solution:

1. **Understand the Definition of Plant-like Protists**:
- Plant-like protists are primarily photosynthetic organisms that can produce their own food using sunlight, similar to plants. They typically have chlorophyll and may have cell walls made of cellulose.

2. **Analyze the Options**:
- **Option 1: Diatoms**
- Diatoms are single-celled algae that are photosynthetic and play a crucial role as primary producers in aquatic environments. They have a silica-based cell wall. Therefore, they are plant-like protists.

- **Option 2: Dinoflagellates**
- Dinoflagellates are marine photosynthetic organisms that are also single-celled eukaryotes. They possess two flagella and are known for their role in marine ecosystems. Thus, they are considered plant-like protists.

- **Option 3: Desmids (likely meant to be "Desmids")**
- Desmids are a group of green algae that are photosynthetic and have a cell wall made of cellulose. They are also classified as plant-like protists.

- **Option 4: Slime Molds**
- Slime molds are not photosynthetic; they are fungus-like protists that feed on decaying organic matter. They do not have chlorophyll and do not perform photosynthesis. Thus, they are NOT plant-like protists.

3. **Conclusion**:
- The organism that is NOT a plant-like protist is **Slime Molds**.

### Final Answer:
**Slime Molds**

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