Asters do not form during mitosis in plants. Astral rays, composed of microtubules, radiate from the centrosphere and look like a cloud. Astral rays are one variant of microtubule which comes out of the centrosome; others include kinetochore microtubules and polar microtubules.

Astral body are formed of Microtubules

The correct answer is option 'A', which states that astral bodies are formed of microtubules. Let's explore this in detail.

What are astral bodies?
Astral bodies are structures that form during cell division in animal cells. They are composed of microtubules and are located around the centrosomes. Astral bodies play a crucial role in the positioning and orientation of the mitotic spindle during cell division.

What are microtubules?
Microtubules are cylindrical structures made up of protein subunits called tubulins. They are dynamic filaments that function as part of the cytoskeleton, providing structural support and serving as tracks for intracellular transport. Microtubules play essential roles in various cellular processes, including cell division, cell motility, and intracellular transport.

Formation of astral bodies:
During cell division, the centrosomes duplicate, and each centrosome moves to opposite poles of the cell. Microtubules radiate out from the centrosomes, forming the astral bodies. These microtubules are called astral microtubules and extend towards the cell periphery. The astral microtubules are shorter and more dynamic compared to the spindle microtubules (those that form the mitotic spindle).

Functions of astral bodies:
1. Positioning and orientation: Astral bodies help in the correct positioning and orientation of the mitotic spindle during cell division. They assist in aligning the spindle along the cell's axis and ensure proper segregation of chromosomes.

2. Spindle assembly: Astral microtubules interact with the cell cortex and generate forces required for spindle assembly and positioning. They help in pushing or pulling the centrosomes towards the cell periphery.

3. Cell polarity: Astral bodies also contribute to the establishment of cell polarity by organizing the cytoskeleton and directing cellular components to specific regions of the cell.

Conclusion:
In conclusion, astral bodies are formed of microtubules. Microtubules are dynamic filaments made up of tubulin subunits and play crucial roles in various cellular processes. Astral bodies, composed of microtubules, are involved in the correct positioning and orientation of the mitotic spindle during cell division. They contribute to spindle assembly, cell polarity, and the overall organization of the cytoskeleton.