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 earlier classification system that were not brought about by R.H. Whittaker, we will analyze each option provided in the question step by step.

### Step 1: Understand R.H. Whittaker's Contribution
R.H. Whittaker proposed a five-kingdom classification system in 1969. The five kingdoms he established are:
1. Monera
2. Protista
3. Fungi
4. Plantae
5. Animalia

This classification was based on various characteristics including cell structure, thallus organization, mode of reproduction, phylogenetic relationships, and modes of nutrition.

### Step 2: Analyze Each Option
Now, let's evaluate the options given in the question to identify which changes were not made by Whittaker.

1. **Blue-green algae are no longer considered as plants.**
- This statement is true. In Whittaker's system, blue-green algae (cyanobacteria) were classified under the kingdom Monera instead of Plantae.

2. **Chlorella, a unicellular alga, is no more considered a plant.**
- This statement is false. Chlorella is still classified under Plantae as it is an alga and retains its classification as a plant.

3. **Amoeba and Paramecium are no longer considered as animals.**
- This statement is true. In Whittaker's classification, both Amoeba and Paramecium were placed in the kingdom Protista, separating them from the Animalia kingdom.

4. **Euglena, a unicellular eukaryote, is no longer considered a fungus.**
- This statement is false. Euglena was never classified as a fungus; it has always been considered a protist. In Whittaker's system, it is placed in the kingdom Protista.

### Step 3: Identify the Correct Answer
From the analysis:
- The second option (Chlorella is no more considered a plant) is the only statement that is incorrect regarding the changes made by R.H. Whittaker. Chlorella remains classified under Plantae.

### Conclusion
The correct answer to the question is that the change regarding Chlorella is not a change brought about by R.H. Whittaker.