Colonial Algae:

Colonial algae are the group of algae that grow in colonies. These algae consist of a group of individual cells that are attached to each other, forming a multicellular organism. The colonies can be simple, with just a few cells, or complex, with thousands of cells.

Which of the Following is Colonial Algae?

The correct answer is Volvax. Volvax is a colonial green algae that forms small spherical colonies. Each colony consists of thousands of individual cells that are arranged in a spherical shape. The cells are interconnected by thin threads, which allow them to communicate and share nutrients.

Other Algae:

The other algae mentioned in the options are as follows:

- Blue-green algae: Blue-green algae are also known as cyanobacteria. They are not colonial algae, but rather single-celled organisms that grow in colonies.

- Chlorella: Chlorella is a unicellular green algae. It does not form colonies.

- Spirulina: Spirulina is a type of filamentous blue-green algae. It does not form colonies.

Conclusion:

In conclusion, Volvax is the only colonial algae mentioned in the options. It is a colonial green algae that forms small spherical colonies consisting of thousands of individual cells. The other options, including blue-green algae, chlorella, and spirulina, are not colonial algae.

Ans is volvox ..