Question

In animals, active mitosis can be observed
A. At the base of nails
B. At the apex of hairs
C. Dermis of skin
D. Glans

Answer 1

Hint: Mitosis is a type of cell division in which a cell is divided into two equal halves. The term mitosis was introduced by Walter Flemming in 1882. During mitosis one round of DNA replication is followed by a single round of chromosome segregation and generating two genetically identical daughter cells.

Complete answer:
The cell divisions that significantly occur in our body are a result of mitosis. All through the whole life span of animals mitosis replaces any exhausted and old cells with new cells. For the living beings that are single-celled eukaryotes, the mitotic division is a propagation structure which adds new organisms to its population.
The primary objective of mitosis is to form tissue and replace old and ruptured cells. It is a very important process in animal's process as well as in plants also.
The M phase of mitosis is the same in both plants and animals whereas cytokinesis is different. In animals cell cleavage furrows are formed and plant cells are divided by cell plate method.
Mitosis is a part of the cell cycle process by which the chromosomes in a cell nucleus are separated into two identical sets of chromosomes. It is an equational cell division. Cells of bone marrow, the base of nails and hypodermis of skin are commonly used to observe mitosis in animal cells.

So, the correct answer is option A. At the base of nails.

Note:
In animal cells cleavage furrows start forming in the anaphase stage this furrow is made due to the contraction of a contractile ring made up of actin and myosin 2 filaments which are bound to the cytoplasmic face of the plasma membrane. In plant cells the formation of a cell plate is started by generation of phragmoplast. The phragmoplast is an array of micro tubeless together with actin filaments and golgi derived vesicles that act as a framework for formation of cell plate.