Multiple choice

Which of the following is a biotic component that affects the fertility of soil?

  1. pH

  2. Air content

  3. Fertilisers

  4. Plant
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Among the options, only plants (D) are biotic (living) components. pH and air content are abiotic factors, while fertilizers are human-added inputs. Plants affect soil fertility through organic matter addition, root exudates, and nutrient cycling - they are living components of the soil ecosystem.

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