Which of the following changes in earlier classification system were not brought about by R.H. Whittaker ?

Options

A. Blue green algae are no longer considered as plants.
B. Chlorella, a unicellular alga is no longer considered as a plant .
C. Amoeba and Paramecium are no longer considered as animals
D. Yeast , a unicellular eukaryote , is no longer considered as fungus

Answer

To solve the question regarding the changes in the classification system brought about by R.H. Whittaker, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding R.H. Whittaker's Contribution**:
- R.H. Whittaker proposed a five-kingdom classification system in 1969, which included Monera, Protista, Fungi, Plantae, and Animalia. His classification aimed to categorize organisms based on cellular organization and nutritional modes.

2. **Analyzing the Options**:
- **Option A**: "Blue-green algae are no longer considered as plants."
- This statement is true. Whittaker classified blue-green algae (cyanobacteria) under the kingdom Monera, separating them from plants.

- **Option B**: "Chlorella, a unicellular algae, is no longer considered as a plant."
- This statement is also true. Chlorella is classified under the kingdom Protista in Whittaker's system, distinguishing it from true plants.

- **Option C**: "Amoeba and Paramecium are no longer considered as animals."
- This statement is true as well. Whittaker classified these organisms under the kingdom Protista, indicating that they are not classified as animals.

- **Option D**: "Yeast, a unicellular eukaryote, is no longer considered as fungus."
- This statement is false. Whittaker classified yeast under the kingdom Fungi, specifically within the Ascomycetes group. Yeast is indeed considered a fungus in his classification system.

3. **Conclusion**:
- The change that was **not** brought about by R.H. Whittaker is **Option D**: "Yeast, a unicellular eukaryote, is no longer considered as fungus."

### Final Answer:
**Option D** is the correct answer as it reflects a change not made by R.H. Whittaker.

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