Cytoskeleton does all the functions except mentioned in option C . Mitochondria is the organelle of cell which produces ATP. Rather , cytoskeleton never does this function.

The correct answer is option 'C': Cytoskeleton is not helpful in the production of ATP.

Explanation:

- The cytoskeleton is a dynamic network of protein filaments that extends throughout the cytoplasm of eukaryotic cells. It plays crucial roles in maintaining cell shape, providing mechanical support, facilitating cell motility, and organizing intracellular components.

1. **Cytoskeleton helps in motility**:
The cytoskeleton is involved in cell motility by providing structural support and facilitating the movement of cellular components. For example, the cytoskeleton is responsible for the contraction and relaxation of muscle cells, allowing for movement. It is also involved in the movement of cilia and flagella, which are important for cell locomotion and the movement of fluid across the cell surface.

2. **Cytoskeleton maintains the shape of the cell**:
The cytoskeleton provides structural integrity to the cell and helps maintain its shape. It forms a framework that supports the plasma membrane and helps resist mechanical stresses. Different components of the cytoskeleton, such as microtubules, microfilaments, and intermediate filaments, contribute to cell shape maintenance.

3. **Cytoskeleton helpful in production of ATP**:
This statement is incorrect. The production of adenosine triphosphate (ATP) primarily occurs in the mitochondria through cellular respiration. The cytoskeleton is not directly involved in ATP production. However, it does play a role in the transport of mitochondria to specific regions of the cell where ATP production is required.

4. **Cytoskeleton helpful in mechanical support**:
The cytoskeleton provides mechanical support to the cell by forming a network of filaments that resist deformation. This support is essential for maintaining cell shape, with different components of the cytoskeleton contributing to the overall mechanical stability of the cell.

In conclusion, the cytoskeleton is involved in various cellular processes, including motility, maintaining cell shape, and providing mechanical support. However, it is not directly involved in the production of ATP.