Find the incorrect statement about Volvox

The correct option is: **somatic cells are non flagellated**.

Volvox is a genus of freshwater green algae that forms spherical colonies. Each colony is composed of thousands of cells organized in a hollow sphere. Understanding the cellular structure and reproductive characteristics of Volvox helps identify the incorrect statement among the options.

Let us analyze each statement to determine its validity:

1. **Somatic cells are non-flagellated (Incorrect Statement):**
The somatic (vegetative) cells of a Volvox colony are actually flagellated. Each somatic cell possesses two flagella, which project outwards from the colony's surface. These flagella beat coordinately to enable the colony to swim and navigate through water. Therefore, the statement that somatic cells are non-flagellated is false, making it the correct choice for this question.

2. **Sexual reproduction is oogamous (Correct Statement):**
Volvox exhibits oogamy, a form of sexual reproduction where a small, motile male gamete (sperm) fertilizes a large, non-motile female gamete (egg).

3. **Phototaxis movement is present (Correct Statement):**
Volvox colonies exhibit phototaxis, which is the movement toward or away from a light source. Each somatic cell has an eyespot (stigma) that detects light, allowing the colony to orient and swim toward light for photosynthesis.

4. **True coelom and no metamerism (Unrelated/Correct Statement in context):**
As a simple colonial green alga, Volvox does not possess animal-like tissues or structures such as a coelom (body cavity) or metamerism (segmentation).

Thus, the incorrect statement about Volvox is that its somatic cells are non-flagellated.