Question

A diploid cell in human, where cell division does not occur:
(a) Heart cell (b) Muscle cell (c) Nerve cell
A. Only c
B. b and c
C. a and c
D. a. b and c

Answer 1

Hint: Cell division is a process in which the parent cell is divided to form daughter cells. Two types of cell division occur i.e., mitosis and meiosis. In mitosis, parent cell divides into two daughter cells and each receives an exact copy of the chromosome like that of the parent cell.

Complete step by step answer:
a. Cardiac cells i.e. the heart cells do not undergo mitosis. Wall of Heart and cardiac muscle both are diploids and do not divide. They only elongate and grow.
b. Skeletal muscle cells; these cells do not perform cell division. When we exercise, initially muscle fibres are damaged and at time of healing, fibre cells elongate and form new filaments and allow the muscle to do more work. So, mitosis does not occur in muscle cells
c. Neuron cells lack a centrosome and hence they do not undergo the process of cell division. Neurons lack mitotic activity. Besides centrosomes, all other cell organelles are present in neurons.
So, the correct answer to the given question is option D.

Note: Somatic cells are diploid cells. Besides the heart cell, muscle cell and neuron cell, the adipose cell also lacks mitotic activity. For growth, somatic cell division is mandatory but when cells lack mitotic activity i.e. ability to divide they grow by elongating themselves. In meiosis type of cell division, the genetic material in the daughter cell is reduced to half that of the parental chromosome number so that fertilization will restore the diploid complement.