Which of the following plant is used for the purification of water

Options

A. Biggiata
B. Chlorella
C. Spirogyra
D. Eichhornia

Explanation

To determine which plant is used for the purification of water, let's analyze the options provided:

1. **Bigiata**: This is not a recognized plant species. Therefore, it cannot be used for water purification. **(Incorrect)**

2. **Chlorella**: This is a type of green algae known for its nutritional benefits and is often used as a dietary supplement. However, it is not primarily known for water purification. **(Incorrect)**

3. **Pyrugeira**: This is also a type of green algae. Similar to Chlorella, it is not specifically used for water purification. **(Incorrect)**

4. **Icornia (likely referring to Eichhornia)**: This plant, commonly known as water hyacinth, is an aquatic angiosperm that is indeed used for the treatment of domestic water. It has the ability to absorb pollutants and improve water quality, making it effective for water purification. **(Correct)**

Based on the analysis, the correct answer is **Icornia (Eichhornia)**.