Question

Which one of the organelles is responsible for the formation of aster in cell division?
a. Ribosome
b. Centrosome
c. Lysosome
d. Chromosome

Answer 1

During the cell division, the M phase involves four phases. Prophase is the first phase in which asters initially appear. They are formed around the centriole and help to organize spindle fibers. The spindle fibers are attached to the chromosomes at their kinetochores. These are the parts of the cytoskeleton.

Complete answer:
• Cell division is a very important process for the development and growth of individuals. Mitosis and Meiosis are two processes for cell division.
• During mitosis and meiosis, a star-shaped cellular structure formed around each centrosome. These are called asterisks. Asters first appear at the prophase. These are the part of the cytoskeleton and made up of microtubules. They radiate from the centrosphere. Centrosomes are formed before aster formation. They consist of two bundles of microtubules called centrioles which stick to each other at a right angle and normally stay near the cell’s nuclear envelope. The centrosome divides into two daughter centrosomes and each migrates to the opposite poles of the nucleus.
• During the process of cell division, centrosomes create two structures: Spindle fibers and asters.
• The asters provide support and guidance to the chromosomes. It ensures that the chromosomes end up in the right place as cell division occurs.
• Ribosome and lysosome are the cell organelles. They do not play any role in cell division. Chromosomes divide and separate during cell division. They do not form asters.

Hence, the correct answer is option (B).

Note: The mitosis cell division involves karyokinesis which occurs in four phases. These are prophase, metaphase, anaphase and telophase. The mitotic cell division forms two daughter cells. These are the copies of the parents. They contain the same number of chromosomes as parents have. In meiosis division, four daughter cells are formed at the end of the meiosis II. It occurs during the gamete formation.