Algae were grouped into how many kingdoms according to Whittaker?

Options

A. Two
B. Three
C. One
D. Four

Answer

**Step-by-Step Solution:**

1. **Understanding the Classification System**: The classification of living organisms was significantly advanced by R.H. Whittaker, who proposed a five-kingdom system. This system categorizes organisms based on their cellular organization and nutritional modes.

2. **Identifying Algae**: Algae are photosynthetic organisms that can be unicellular or multicellular. They are primarily found in aquatic environments and play a crucial role in ecosystems as primary producers.

3. **Algae in Whittaker's Classification**: In Whittaker's five-kingdom classification, algae are categorized into three different kingdoms:
- **Monera**: This kingdom includes prokaryotic organisms, such as cyanobacteria (blue-green algae).
- **Protista**: This kingdom includes unicellular eukaryotic organisms, which encompass many types of unicellular algae.
- **Plantae**: This kingdom includes multicellular algae that perform photosynthesis.

4. **Conclusion**: Based on the classification, algae are represented in three kingdoms: Monera, Protista, and Plantae. Therefore, the answer to the question is that algae were grouped into **3 kingdoms** according to Whittaker.

5. **Final Answer**: The correct option is **B: 3**.

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