Question

Find out the incorrect statement:
A) During cell growth karyoplasmic index decreases.
B) During cell growth nucleoplasmic ratio decreases.
C) During cell growth cellular surface area increases.
D) During cell growth surface volume ratio increases.

Answer 1

Hint: Cell growth is referred to as increase in the cell number which takes place due to repeated cell division. Cell growth is also referred to as increase in the cell volume in the absence of cell division.

Complete answer:
Cell growth is the increase in the total mass of the cell which includes cytoplasm, nuclear and organelle volume. Cellular growth takes place when the cellular biosynthesis is greater than the overall cellular degradation.

Karyoplasmic index is the relationship between the sizes of the nucleus to the size of the cell. The nucleus is responsible for the division of the cell. In case of cell growth or division, the nucleus is not able to control the activity of the cell. As a result of which karyoplasmic index decreases. This leads to division of the cell into two daughter cells in case of mitosis. (Option A is correct).

Nucleoplasmic ratio refers to the ratio between the volume of the nucleus to the volume of the cytoplasm. The decrease in the nucleoplasmic ratio initiates cell division. (Option B is correct)

Cellular surface area is the area outside of the cell. The cellular volume is the space inside the cell. During cell growth, the surface area increases and the surface volume decreases so as to accumulate the growing organelles. (Option C is correct and D is incorrect).

Thus the correct answer is option D.

Note: Cell growth is the result of two types of cell division called the mitosis and the meiosis. The mitosis takes place in the somatic cells. It is important for growth and repair of the body. The meiosis takes place in the sex cells. Meiosis is important for reproduction.