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State PCS PYQPrelims 2025

BPSC – Combined Competitive Examination · Question 150

In a mycorrhizal association, the advantage to the plant is:

  1. Protection
  2. Food
  3. Both (A) and (B)
  4. Increased mineral absorption and disease protection
Show answer & explanation

Answer: (D) Increased mineral absorption and disease protection

Explanation

Mycorrhiza is a mutualism: the fungus aids mineral (especially P) uptake and root protection; the plant supplies carbohydrates.

  • (A) Incorrect

    Wrong: partly true, but mineral uptake is the main benefit.

  • (B) Incorrect

    Wrong: the plant gives sugars to the fungus, not the reverse.

  • (C) Incorrect

    Wrong: food is not the plant's gain.

  • (D) Correct

    Correct: the fungus boosts phosphorus/water uptake and protects roots from pathogens.