Question

SH: Cancereous cells just continue to divide giving rise to masses of cells called tumours
S-Il Cancer cells appears to have lost property of contact inhibition
(A) S-land S-Il both are true
(B) S-T is true but S-II is wrong
(C) S-l is wrong but S-II is true
(D) S-1 and S-Il both are wrong
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Answer 1

Answer:

A) S-I and S-II both are true

Explanation:

In our body, normal cells show the property of contact inhibition, that is when cells come in contact with other cells, inhibition of their uncontrolled growth occurs. Cancer cells appear to have lost this property and they continue to divide giving rise to numerous masses of cells called tumors.

These tumors are of two types: Benign and malignant tumors. Benign tumors remain confined to their site of origin and normally do not spread to other parts of the body hence causing little damage.

Malignant tumors grow very rapidly and are a mass of proliferating cells called neoplastic or tumor cells. They invade and damage the surrounding tissues. They have the property of metastasis by which they reach distant sites of the body and start a new tumor there. These cancerous cells also compete with the normal cells for vital nutrients.

Cancer is caused due to physical, chemical or biological agents called carcinogens. Cancer can be detected by using many techniques such as radiography, MRI or CT. Immunotherapy, chemotherapy, surgery are some of the common methods for the treatment of cancer.

Answer 2

Answer:

Question :-

$\longmapsto$ S - I : Cancerous cells just continue to divide giving rise to masses of cells called tumours.

$\longmapsto$ Cancer cells appears to have lost property of contact inhibition.

Options :

(A) S - I and S - II both are true.

(B) S - I is true but S - II is wrong.

(C) S - I is wrong but S - II is true.

(D) S - I and S - II are wrong.

Answer :-

$\longmapsto$ S - I : Cancerous cells just continue to divide giving rise to masses of cells called tumours.

$\longmapsto$ S - II : Cancer cells appears to have lost property of contact inhibition.

$\implies$ (A) S - I and S - II are true .

$\rule{150}{2}$

EXTRA INFORMATION :-

$\leadsto$ Cell Division :

$\implies$ The active process by which a matured mother cell duplicates itself to give rise to two daughter cells is called cell division.

$\mapsto$ Types of Cell Division :

$\implies$ In animals and plants three types of cell division have been distinguished :

• Amitosis or Direct Cell Division
• Mitosis or Indirect Cell Division
• Meiosis or Reduction Division

$\leadsto$ Cell Cycle or Mitotic Cycle :

$\implies$ The sequence of cyclical events and changes through which a cell is born, grows (by G₁, S, G₂ stages), becomes mother cell and finally divides to form two daughter cells is known as cell cycle.

$\leadsto$ Tumor :

$\implies$ Tumor is a type of unnatural swelling in any part of a body.

Generally, tumor is of two types :

• Benign Tumor
• Malignant Tumor