EVERYDAY SCIENCE

Detailed explanation-1: -The key feature of metaphase is the attachment of spindle fibres to kinetochores of chromosomes. Kinetochores are disc shaped structures at the surface of the centromeres. These structures serve as the sites of attachment of spindle fibres to the chromosomes.

Detailed explanation-2: -Option C: Chromosomes are attached to the spindle fibres by their Kinetochores, a disc-shaped protein structure. Therefore, this is the correct option.

Detailed explanation-3: -The centromere is the part of a chromosome that links sister chromatids. During mitosis, spindle fibers attach to the centromere via the kinetochore.

Detailed explanation-4: -The stage of mitosis during which mitotic spindle fibres attach to kinetochores is called Prometaphase. During prometaphase, the nuclear membrane breaks down, allowing microtubles to interact with the condensed chromosomes. Each chromosome attaches to the microtubules via kinetochores.

Detailed explanation-5: -Metaphase. The chromosomes align in the equatorial plane of the spindle fibers and form the metaphase plate. This constitutes a significant proportion of the mitosis phase duration. The opposite kinetochores are attached to spindles originating from the opposite poles through kinetochore microtubules (Fig.