In the five - kingdom classification Chlamydomonas and Chlorella have been included in

Options

A. (a) protista
B. (b) algae
C. (c) plantae
D. (d) monera

Answer

**Step-by-Step Solution:**

1. **Understanding Five-Kingdom Classification**: The five-kingdom classification system was proposed by R.H. Whittaker. It categorizes living organisms into five distinct kingdoms based on their cellular organization and nutritional modes.

2. **Identifying the Kingdoms**: The five kingdoms are:
- Monera: Unicellular prokaryotes (e.g., bacteria)
- Protista: Unicellular eukaryotes (e.g., protozoa, some algae)
- Fungi: Multicellular eukaryotes that are heterotrophic (e.g., mushrooms, molds)
- Plantae: Multicellular eukaryotes that are autotrophic (e.g., flowering plants)
- Animalia: Multicellular eukaryotes that are heterotrophic (e.g., animals)

3. **Analyzing Chlamydomonas and Chlorella**: Both Chlamydomonas and Chlorella are unicellular organisms. They possess chloroplasts, which allow them to perform photosynthesis, making them autotrophic. However, they can also absorb nutrients from their environment, indicating some heterotrophic characteristics.

4. **Placement in Kingdoms**: Historically, Chlamydomonas and Chlorella were classified under the kingdom of algae. However, in the five-kingdom classification, there is no separate kingdom for algae. Instead, these organisms are classified under the kingdom Protista because they are unicellular and eukaryotic.

5. **Conclusion**: Therefore, Chlamydomonas and Chlorella are included in the kingdom Protista according to the five-kingdom classification.

**Final Answer**: Chlamydomonas and Chlorella have been included in the kingdom **Protista**.

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