Role of microtubules :

Options

A. To help in cell division
B. Cell membrane formation
C. Respiration
D. Pinocytosis

Answer

### Step-by-Step Solution:

1. **Understanding Microtubules**: Microtubules are cylindrical structures made of tubulin proteins. They are a key component of the cytoskeleton in eukaryotic cells.

2. **Role in Cell Division**: One of the primary functions of microtubules is to facilitate cell division. During mitosis, microtubules form the spindle fibers that are essential for separating chromosomes.

3. **Sister Chromatid Separation**: During the anaphase stage of mitosis, microtubules attach to the kinetochores of sister chromatids. They pull the sister chromatids apart towards opposite poles of the cell, ensuring that each daughter cell receives an identical set of chromosomes.

4. **Formation of the Spindle Apparatus**: Microtubules originate from the centrosomes, which contain centrioles. The centrosomes organize the microtubules into a spindle apparatus that aligns and separates the chromosomes during cell division.

5. **Conclusion**: The main role of microtubules is to help in cell division by ensuring the proper segregation of chromosomes. This is crucial for maintaining genetic stability in daughter cells.

### Final Answer:
The role of microtubules is to help in cell division, specifically by separating sister chromatids during mitosis.