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प्रश्न
What is cancer?
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उत्तर
Cancer is the uncontrolled growth of abnormal cells in the body. Cancer develops when the body’s normal control mechanism stops working. Old cells do not die and instead grow out of control, forming new, abnormal cells. These extra cells may form a mass of tissue, called a tumor. Some cancers, such as leukemia, do not form tumors.
संबंधित प्रश्न
How is a cancerous cell different from a normal cell?
What is a carcinogen?
Give the symptoms of cancer.
Differentiate between a benign tumor and a malignant tumor.
Carcinoma is cancer of ______ cells.
What is ‘Leukemia’?
Cancer cells are more easily damaged by radiations than normal cells because they are ______.
How is a cancer cell different from a normal cell?
Stomach cancer is characterised as ______.
All of the following are cancer-causing, EXCEPT ______.
One of the following is INCORRECT about cancer cells.
In malignant tumors, the cells proliferate, grow rapidly and move to other parts of the body to form new tumors. This stage of disease is called ______.
AIDS is caused by HIV. Among the following, which one is not a mode of transmission of HIV?
In the given flow diagram, the replication of retrovirus in a host is shown. Observe and answer the following questions.
Fill in (1) and (2)
Why is the virus called retrovirus?
Can the infected cell survive while viruses are being replicated and released?
The interferons are ______.
Treatment of cancer by X-rays or gamma rays is ______.
Why is a malignant tumour considered to be more damaging than a benign tumour? Explain.
Immunotherapy these days is one of the most efficient ways of treatment of cancer. The therapy involved activates the immune system and destroys the tumour.
- Write an example of one such biological response modifier used in immunotherapy.
- Why do patients need such substances if immune system is already working in body?
- State what is 'Contact inhibition'.
