Multiple choice

An naturally occurring organic substance applied to the soil for the purpose of maintaining fertility is called�

  1. Bio-chemical

  2. Bio-fertilizer

  3. Bio-gas

  4. All of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bio-fertilizers are naturally occurring organic substances derived from biological materials that enhance soil fertility. They contain living microorganisms or organic matter that enriches soil nutrients, unlike chemical fertilizers.