IN THE MICROFILAMENT CONSIDERING THE THE INVOLVEMENT OF CYCLOSIS IS NOT CONSIDERED.

**Microfilaments perform all the functions except:**

1. **Provide support to the plasma membrane:**
Microfilaments, also known as actin filaments, are one of the three types of cytoskeletal filaments found in the cytoplasm of eukaryotic cells. They are involved in various cellular functions, such as cell shape determination, cell division, cell motility, and intracellular transport. However, they do not directly provide support to the plasma membrane. Instead, they contribute to the overall structural integrity of the cell by interacting with other cytoskeletal components.

2. **Involved in cyclosis:**
Cyclosis, also known as cytoplasmic streaming, is the movement of cytoplasm within a cell. It aids in the distribution of nutrients, organelles, and other substances throughout the cell. Microfilaments play a crucial role in cyclosis by providing the necessary structural support and facilitating the movement of cytoplasmic components. They form a network of tracks along which organelles and vesicles can move, allowing for efficient intracellular transport.

3. **Help in the cell plate method during cell division:**
During cell division, microfilaments participate in various processes, including cytokinesis, the final stage of cell division. In plant cells, a structure called the cell plate forms between the two daughter cells during cytokinesis. Microfilaments are involved in the organization and positioning of the cell plate, ensuring its proper assembly and fusion with the pre-existing plasma membrane. This process leads to the formation of two separate cells.

4. **Help in pseudopodia formation:**
Pseudopodia are temporary extensions of the cell membrane that enable cell movement and the capture of prey in some organisms, such as amoebas. Microfilaments are responsible for the formation and extension of pseudopodia. By polymerizing and depolymerizing, they create a dynamic network that pushes the plasma membrane forward, allowing the cell to project and retract pseudopodia. This mechanism facilitates cell locomotion and the engulfment of food particles.

In conclusion, microfilaments perform all the mentioned functions except providing direct support to the plasma membrane. They are involved in cyclosis, help in the cell plate method during cell division, and play a crucial role in pseudopodia formation. These functions highlight the versatility and importance of microfilaments in various cellular processes.