Ncert Exercises & Solutions

Q. 58 What is cancer? How is a cancer cell different from the normal cell? How do normal cells attain cancerous nature?

An abnormal and uncontrolled division of cells is termed as cancer. Genes called cellular oncogenes (c-onc) or proto-oncogens present in normal cells when activated under certain conditions lead oncogenic transformation of the normal cells leading cancer.

A cancer cell is diferent from| the normal cell in following ways

Cancer cell	Normal cell
Cancer cells divvide in an uncontrolled Manner	Normal cells divide in a controlled Manner.
The cells do not show contact inhibition.	The cells show contact inhibition.
Life span is indefinite.	Life span is definite.

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