Part of spindle left after chromosomes have moved to poles is

Options

A. Centrosome
B. Centriole
C. Chromocentre
D. Phragmoplast

Answer

**Step-by-Step Solution:**

1. **Understanding the Spindle Structure**: The spindle apparatus is a structure made up of microtubules that helps in the separation of chromosomes during cell division. After the chromosomes have moved to the poles of the cell, there are parts of the spindle that remain.

2. **Identifying the Leftover Spindle Part**: The part of the spindle that is left after the chromosomes have segregated is involved in further cellular processes. This leftover structure is associated with microfilaments.

3. **Formation of Phragmoplast**: The leftover spindle fibers combine with actin filaments (microfilaments) and merge with the endoplasmic reticulum. This merging leads to the formation of a new cylindrical structure known as the phragmoplast.

4. **Function of Phragmoplast**: The primary function of the phragmoplast is to serve as a precursor to the cell plate. The cell plate is crucial during cytokinesis in plant cells, where it helps in the division of the cytoplasm.

5. **Cytokinesis**: During cytokinesis, the phragmoplast aids in the fusion of vesicles that carry cell wall materials, ultimately forming the cell plate that separates the two daughter cells.

6. **Conclusion**: Therefore, the part of the spindle that is left after the chromosomes have moved to the poles is referred to as the **phragmoplast**.

**Final Answer**: Phragmoplast

---