Centrioles take part in formation of

Options

A. cell plate
B. spindle
C. nucleolus
D. start of cell division

Answer

### Step-by-Step Solution:

1. **Understanding Centrioles**: Centrioles are cylindrical structures found in the cells of most eukaryotes. They are made up of microtubules and are typically found in pairs.

2. **Role in Cell Division**: Centrioles play a crucial role during cell division, particularly in the formation of the spindle apparatus. This is essential for the proper segregation of chromosomes.

3. **Formation of Spindle Apparatus**: During the metaphase of cell division, the nuclear envelope disintegrates, leading to the formation of the spindle apparatus. The spindle apparatus is a structure made of microtubules that helps in the movement of chromosomes.

4. **Attachment to Chromosomes**: The spindle fibers attach to the centromeres of the chromosomes. This attachment is vital for the separation of sister chromatids during anaphase.

5. **Movement of Chromosomes**: Once the spindle fibers are attached, they help pull the chromatids apart, moving them toward opposite poles of the cell. This ensures that each daughter cell receives an identical set of chromosomes.

6. **Additional Functions**: Besides their role in cell division, centrioles also contribute to the formation of basal bodies, which are essential for the development of cilia and flagella.

7. **Conclusion**: Therefore, the correct answer to the question "Centrioles take part in formation of" is the "spindle apparatus."