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A rice farmer's field… (Class 12 Biology SQP 2026-27, Q12)

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BiologyCBSE Class 12 · Sample paper, session 2026-27 · 1 mark · MCQ

CBSE Class 12 Biology sample paper 2026-27: question 12

From the official CBSE sample question paper for 2026-27, section A, question 12, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q12 · 1 mark · MCQCompetency-basedMicrobes in Human Welfare

A rice farmer's field, which typically thrives in waterlogged conditions and requires soil rich in nutrients like phosphorus, is experiencing a severe drought this year. The crop is also susceptible to root infestation by pathogens. Which of the following techniques is best to address all these issues?

  1. (A)Adding nitrogen-fixing bacteria to the soil
  2. (B)Applying chemical fertilizers
  3. (C)Adding spores of Glomus to the soil
  4. (D)Flooding the field artificially to mimic normal conditions

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2026-27.

Hints

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

Hint 1

Look for one biofertiliser that solves all three problems.

Hint 2

Think of a fungal association with roots.

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. Glomus is a mycorrhizal fungus.

  2. It absorbs phosphorus for the plant and also gives tolerance to drought and resistance to root pathogens, so it addresses all three problems. Option (C).

    1 mark

Answer: (C) Adding spores of Glomus

Where the marks are

  • Recognises that mycorrhiza provides phosphorus uptake, drought tolerance and pathogen resistance (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Microbes in Human Welfare, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2026-27: 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.