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Explain how are plants… (Class 12 Biology 2024, Q20)

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BiologyCBSE Class 12 · Board exam 2024, set 57/5/1 · 2 marks · Very short answer

CBSE Class 12 Biology 2024: question 20

Set in the CBSE Class 12 board exam of 2024, paper 57/5/1, section B, question 20, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q20 · 2 marks · Very short answerMicrobes in Human Welfare

Explain how are plants benefitted by their association with "Glomus species".

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 57/5/1.

Hints

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

Hint 1

Glomus is a mycorrhizal fungus used as a biofertiliser.

Hint 2

Which mineral nutrient does it help roots take up, and what stresses does it help the plant withstand?

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 fungus that forms mycorrhiza with plant roots. Its hyphae absorb phosphorus from the soil and pass it to the plant.

    1 mark

  2. Plants with this association also gain resistance to root-borne pathogens, tolerance to salinity and drought, and an overall increase in growth and development.

    1 mark

Answer: Glomus (mycorrhiza) absorbs phosphorus for the plant and gives resistance to root pathogens, tolerance to salinity and drought, and better overall growth.

Where the marks are

  • Absorbs phosphorus from the soil and passes it to the plant (1 mark)
  • Any other benefit: resistance to root-borne diseases, tolerance to salinity or drought, or increased growth (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 paper2024 board paper, set 57/5/1: 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.