Multiple choice

Which of the following substances is not an example of fertilizer?

  1. Potash

  2. Ammonium sulphate

  3. Humus

  4. NPK
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

NPK, potash and ammonium sulphate are inorganic substances being prepared in the factories. They help in increasing the soil fertility. Humus is the organic component of soil formed by the decomposition of leaves and other plant materials by soil microorganisms. Hence, humus is not an example of fertilizer.

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