CBSE Class 12 Biology 2023: question 25
Set in the CBSE Class 12 board exam of 2023, paper 57/1/1, section C, question 25, for 3 marks. Try it first; the hints and our step-by-step solution are below.
Q25 · 3 marks · Short answerHuman Health and Disease
(a) Differentiate between malignant and benign tumours.
(b) Name and explain the most feared property of a malignant tumour.
Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 57/1/1.
Hints
Open one hint at a time and try again before the next.
Hint 1
Compare how fast each type grows and whether it stays in one place.
Hint 2
Which property allows cancer to appear in organs far from the original site?
Step-by-step solution
Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.
- 1 mark
(a)
Malignant tumour Benign tumour A mass of proliferating cells that grow very rapidly, invading and damaging surrounding normal tissue Grows slowly and stays confined to its original location Shows metastasis Does not show metastasis - 1 mark
(b) The most feared property of a malignant tumour is metastasis.
- 1 mark
In metastasis, cells slough off from the tumour and travel through the blood to distant sites. Wherever they lodge, they start new tumours.
Answer: (a) Malignant – rapid invasive growth, shows metastasis; benign – slow, confined, no metastasis; (b) metastasis – tumour cells spread via blood and start new tumours at distant sites
Where the marks are
- Correct difference between malignant and benign tumours (1 mark)
- Names metastasis (1 mark)
- Explains that cells slough off, spread via blood and form new tumours elsewhere (½ + ½ mark)
Revise the chapter
- Chapter: Human Health and Disease (notes, formulas, where marks are lost and every past question)
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