Whittaker proposed 5-kingdom classification in

Options

A. 1969
B. 1959
C. 1978
D. 1988

Answer

**Step-by-Step Text Solution:**

1. **Identify the Question**: The question asks when Whittaker proposed the five-kingdom classification system.

2. **Recall Whittaker's Contribution**: R.H. Whittaker is known for proposing the five-kingdom classification system, which categorizes living organisms into five distinct kingdoms based on specific criteria.

3. **Review the Options Provided**: The options given are 1969, 1959, 1978, and 1988.

4. **Determine the Correct Year**: Whittaker proposed the five-kingdom classification in the year 1969. This is the correct answer.

5. **Understand the Basis of Classification**: Whittaker's classification is based on several criteria, including:
- Complexity of cell structure
- Complexity of body structure
- Mode of nutrition
- Ecological lifestyle
- Phylogenetic relationships

6. **List the Five Kingdoms**: The five kingdoms proposed by Whittaker are:
- Kingdom Monera (prokaryotes)
- Kingdom Protista (unicellular eukaryotes)
- Kingdom Fungi (fungi)
- Kingdom Plantae (multicellular eukaryotic plants)
- Kingdom Animalia (multicellular animals)

7. **Conclude with the Answer**: Therefore, the correct answer to the question is option A, which is 1969.

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