AP BIOLOGY

Detailed explanation-1: -It is because of the meristematic cells that are situated in the tip of the roots that render the most desirable and suitable raw material to study the different stages of mitosis. Onion is a monocot plant. Monocotyledonous plants possess large chromosomes that are clearly visible. Hence, their root tips are used.

Detailed explanation-2: -Apical Meristem These are present at the tips of the roots and shoots and helps in the increase of the height of the plants. Various cell divisions facilitate the growth of the cells in the roots and shoots and help in cellular enlargement.

Detailed explanation-3: -Chromosomes in the original cell are duplicated to ensure that the two new cells have full copies of the necessary genetic information. The process of mitosis generates new cells that are genetically identical to each other. Mitosis helps organisms grow in size and repair damaged tissue.

Detailed explanation-4: -Root tip as compared to the leaf tip is the best material to study mitosis. Root tip is a rapidly growing part of a plant body and thus many cells will be in different stages of mitosis.