Which of the following organisms have been placed under kingdom Protista?

Options

A. Chrysophytes and dinoflagelates
B. Euglenoids
C. Slime moulds and protozoans
D. All of these

Explanation

To determine which organisms have been placed under the kingdom Protista, we can analyze the provided options step by step.

### Step 1: Understanding Kingdom Protista
- Kingdom Protista includes a diverse group of eukaryotic organisms that are primarily unicellular or simple multicellular organisms. This kingdom is known for its variety, including protozoans, algae, and slime molds.

### Step 2: Analyzing the Options
1. **Chrysophytes and Dinoflagellates**:
- These are types of algae that fall under the kingdom Protista. Chrysophytes are golden algae, and dinoflagellates are known for their flagella and can be found in marine environments.

2. **Euglenoids**:
- Euglenoids, such as Euglena, are also classified under Protista. They are characterized by their flagella and can photosynthesize due to the presence of chloroplasts.

3. **Slime Molds**:
- Slime molds are another group of organisms that belong to the kingdom Protista. They exhibit characteristics of both fungi and protozoans and are known for their unique life cycle.

4. **Protozoans**:
- Protozoans are single-celled organisms that are part of the kingdom Protista. Examples include amoeba and paramecium.

### Step 3: Conclusion
- Since all the provided options (Chrysophytes and Dinoflagellates, Euglenoids, Slime Molds, and Protozoans) are included in the kingdom Protista, the correct answer is **all of these**.

### Final Answer
- **All of these** (Option D) are placed under the kingdom Protista.

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