Assertion : Benign tumours are called neoplastic cells.
Reason : Malignant tumour remain in place to form a compact mass by a process known as metastasis.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertin is true but reason is false.
D. If both assertion and reason are false.

Answer

D

Explanation

Tumours are of two types : benign and malignant. Benign tumours normally remain confined to their original location and do not spread to other parts of the body and cause little damage. The malignant tumours, on the other hand are mass of proliferating cells called neoplastic or tumour cells. These cells grow very rapidly, invading and damaging the surrounding normal tissues. As these cells actively divide and grow, they also starve the normal cells by competing for vital nutrients. Cells sloughed from such tumours reachdistant sites through blood, and wherever they get lodged in the body, they start a new tumour there. This property is called metastasis which is the most feared property of malignant tumours.