Multiple choice

Decomposition of organic matter is brought about by

  1. protozoa

  2. plants

  3. micro-organisms

  4. None of these

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

Decomposition of organic matter (dead plants, animals, waste) is primarily carried out by microorganisms including bacteria and fungi. These saprotrophs break down complex organic molecules, recycling nutrients back into the ecosystem. Protozoa contribute to but don't drive decomposition.