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A person is suffering from… (Class 12 Biology 2025, Q25)

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BiologyCBSE Class 12 · Board exam 2025, set 57/7/1 · 3 marks · Short answer

CBSE Class 12 Biology 2025: question 25

Set in the CBSE Class 12 board exam of 2025, paper 57/7/1, section C, question 25, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q25 · 3 marks · Short answerCompetency-basedHuman Health and Disease

A person is suffering from high grade fever. Which symptoms will help to identify if he/she is suffering from Typhoid, Pneumonia or Malaria ?

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 57/7/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Each disease has a typical pattern of fever or an extra symptom.

Hint 2

Look for a sustained fever, a fever with breathing difficulty, and a fever that recurs periodically.

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. Typhoid: sustained high fever of about 39–40 °C, with weakness, stomach pain, constipation, headache and loss of appetite.

    1 mark

  2. Pneumonia: fever with chills and cough, and difficulty in breathing because the alveoli get filled with fluid. In severe cases the lips and fingernails turn grey to bluish.

    1 mark

  3. Malaria: high fever with chills that recurs every 3–4 days, when Plasmodium released from bursting RBCs releases the toxin haemozoin.

    1 mark

Answer: Typhoid: sustained fever of 39–40 °C with stomach pain and constipation; Pneumonia: breathing difficulty, chills and cough, bluish lips and nails; Malaria: chills and high fever recurring every 3–4 days.

Where the marks are

  • Typhoid symptom: sustained 39–40 °C fever, stomach pain or constipation (1 mark)
  • Pneumonia symptom: respiratory problems or bluish lips and nails (1 mark)
  • Malaria symptom: chills and high fever recurring every 3–4 days (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Human Health and Disease, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 57/7/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.