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Biology · 2026 · 3 marks
CBSE 2026 · Region 4 · Set 1 · Q25
(a) How do some viruses cause cancer in humans? (b) How do benign tumours turn malignant? How do malignant tumours harm the human body?
(a)
How do some viruses cause cancer in humans ?
(b)
How do benign tumours turn malignant ? How do malignant tumours harm the human body ?
Marking-scheme solution
(a)
The cancer causing viruses called oncogenic viruses have genes called viral oncogenes which transform normal cell into cancerous cells.
(b)
• When the cells of a benign tumour acquire the property of metastasis under
certain conditions.
• These cells damage the surrounding normal cells of the body / They compete
with the normal cells and starve them of vital nutrients.
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CBSE Class 12 Biology past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.