Which is common amongst Euglena, Amoeba, Entamoeba and Trypanosoma

Options

A. Binary fission
B. Contractile vacuole
C. Holozoic nutrition
D. Multiple fission

Answer

To determine what is common among Euglena, Amoeba, Entamoeba, and Trypanosoma, we will analyze the options provided in the context of their biological characteristics.

### Step-by-Step Solution:

1. **Understanding the Organisms**:
- **Euglena**: A unicellular organism that has both plant and animal characteristics. It can perform photosynthesis due to chloroplasts but is also capable of heterotrophic nutrition.
- **Amoeba**: A unicellular organism known for its shape-shifting abilities and movement through pseudopodia. It primarily feeds through phagocytosis.
- **Entamoeba**: A genus of amoebas, some of which are parasitic, such as Entamoeba histolytica, which causes amoebic dysentery.
- **Trypanosoma**: A genus of parasitic protozoa known for causing diseases such as sleeping sickness and Chagas disease.

2. **Evaluating the Options**:
- **Option A: Binary Fission**: This is a method of asexual reproduction where a parent cell divides into two daughter cells. All four organisms (Euglena, Amoeba, Entamoeba, and Trypanosoma) reproduce through binary fission.
- **Option B: Contractile Vacuoles**: These are present in some protozoa to expel excess water. While Amoeba and Entamoeba have contractile vacuoles, Euglena and Trypanosoma do not, making this option incorrect.
- **Option C: Holozoic Nutrition**: This type of nutrition involves the ingestion of solid food. While Amoeba and Entamoeba exhibit holozoic nutrition, Euglena is primarily autotrophic, and Trypanosoma is parasitic, so this option is also incorrect.
- **Option D: Multiple Fission**: This is a type of asexual reproduction where a parent cell divides into multiple daughter cells. It is characteristic of some protozoa like Amoeba but not of Euglena or Trypanosoma, making this option incorrect.

3. **Conclusion**:
- The only characteristic that is common among Euglena, Amoeba, Entamoeba, and Trypanosoma is **binary fission**. Therefore, the correct answer is **Option A: Binary Fission**.

### Final Answer:
The common characteristic amongst Euglena, Amoeba, Entamoeba, and Trypanosoma is **binary fission**.

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