Select the statements which do not hold true for Cancer:
A. Cancerous cells show a property of contact inhibition.
B. Metastasis is the most feared property of malignant tumors.
C. Malignant tumor cells invade and damage the surrounding tissue.
D. Malignant tumor cells grows slowly.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → A and D only
A. Cancerous cells show a property of contact inhibition. — False. Normal cells show contact inhibition; cancer cells have lost it, so they keep dividing into masses called tumours.
B. Metastasis is the most feared property of malignant tumors. — True. Cells break off, travel in the blood and start new tumours far away.
C. Malignant tumor cells invade and damage the surrounding tissue. — True. This invasion is what makes them malignant.
D. Malignant tumor cells grows slowly. — False. Malignant cells grow very rapidly, starving normal cells of nutrients.
NCERT Extract:
Cancer – “… In our body, cell growth and differentiation is highly controlled and regulated. In cancer cells, there is breakdown of these regulatory mechanisms. Normal cells show a property called contact inhibition by virtue of which contact with other cells inhibits their uncontrolled growth. Cancer cells appears to have lost this property. As a result of this, cancerous cells just continue to divide giving rise to masses of cells called tumors.”
Cancer – “… The malignant tumors, on the other hand are a mass of proliferating cells called neoplastic or tumor cells. These cells grow very rapidly, invading and damaging the surrounding normal tissues.”