In five kingdom classification, Euglena is included under

Options

A. Monera
B. Plantae
C. Animalia
D. Protista.

Answer

### Step-by-Step Solution:

1. **Understanding the Five Kingdom Classification**: The five kingdom classification system was proposed by R.H. Whittaker in 1969. It categorizes all living organisms into five distinct kingdoms: Monera, Protista, Fungi, Plantae, and Animalia.

2. **Identifying the Characteristics of Each Kingdom**:
- **Monera**: This kingdom includes unicellular prokaryotic organisms, which lack a true nucleus.
- **Protista**: This kingdom consists of unicellular eukaryotic organisms, which have a defined nucleus.
- **Fungi**: This kingdom includes multicellular eukaryotes (with the exception of yeast, which is unicellular).
- **Plantae**: This kingdom comprises multicellular eukaryotic organisms that are autotrophic (capable of photosynthesis).
- **Animalia**: This kingdom consists of multicellular eukaryotic organisms that are heterotrophic (consume other organisms for food).

3. **Classifying Euglena**: Euglena is a unicellular organism that possesses characteristics of both plants and animals. It has a flagellum for movement and can perform photosynthesis due to the presence of chloroplasts, but it can also feed heterotrophically in the absence of light.

4. **Conclusion**: Based on its characteristics, Euglena is classified as a unicellular eukaryote, which places it in the kingdom **Protista**.

### Final Answer:
Euglena is included under the kingdom **Protista** in the five kingdom classification.

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