Multiple choice

Select the biofertilizer in the following

  1. Compost

  2. Ammonium sulphate

  3. Cattle dung

  4. Algae and blue-green algae
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Algae and blue-green algae (cyanobacteria) are biofertilizers as they fix atmospheric nitrogen and enrich soil fertility. Compost and cattle dung are organic manures, not biofertilizers. Ammonium sulphate is a chemical fertilizer. Biofertilizers are living microorganisms that enhance nutrient availability.

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