Aster is

Options

A. centriole
B. astral rays and Microtubular spindle
C. centriole and astral rays
D. centriole spindle

Answer

### Step-by-Step Solution:

1. **Understanding the Term "Aster":**
- An aster is a cellular structure that appears star-shaped during the early stages of cell division.

2. **Components of an Aster:**
- The aster is primarily composed of centrioles and microtubules. Centrioles are cylindrical structures that are part of the centrosome.

3. **Formation of Aster:**
- The aster forms during the early stages of cell division when microtubules originate from the centrioles. These microtubules radiate outward, giving the aster its characteristic star-like appearance.

4. **Role of Centrioles:**
- Centrioles act as microtubule organizing centers. They help in the polymerization of tubulin proteins to form microtubules.

5. **Microtubules in Aster:**
- The microtubules that extend from the centrioles capture chromosomes and assist in their separation during cell division.

6. **Occurrence in Cell Types:**
- Aster formation is specific to animal cells, as plant cells do not contain centrioles.

7. **Identifying the Correct Option:**
- Given the options:
- A) Centriole
- B) Astral rays and microtubular spindle
- C) Centriole and astral rays
- D) Centriole spindle
- The correct answer is **C) Centriole and astral rays**, as both components are integral to the structure of an aster.