Which of the following criteria for five kingdom classification was not used by R.H. Whittaker ?

Options

A. Thallus organisation
B. Mode of nutrition
C. Phylogenetic relationship
D. Types of ribosomes

Answer

To solve the question regarding which criteria for the five kingdom classification was not used by R.H. Whittaker, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Five Kingdom Classification**: R.H. Whittaker proposed the five kingdom classification system which includes Monera, Protista, Fungi, Plantae, and Animalia.

2. **Identify the Criteria Used by Whittaker**: The classification was based on several criteria:
- **Thallus Organization**: This refers to the structural organization of the organism, whether it is unicellular or multicellular.
- **Mode of Nutrition**: This includes how organisms obtain their food, such as autotrophic (self-feeding) or heterotrophic (feeding on others).
- **Phylogenetic Relationship**: This involves the evolutionary relationships among organisms, indicating their common ancestry.

3. **Evaluate the Options**: The options provided are:
- Thallus organization
- Mode of nutrition
- Phylogenetic relationship
- Types of ribosomes

4. **Determine the Excluded Criterion**: Among the options, the types of ribosomes were not a criterion used by Whittaker in his classification. The classification did not focus on the molecular or biochemical characteristics such as ribosomal types.

5. **Conclude the Answer**: Therefore, the correct answer to the question is **types of ribosomes**.

### Final Answer:
The criterion for five kingdom classification that was not used by R.H. Whittaker is **types of ribosomes**.

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