Microorganisms present in soil are the part of __________.

  1. Biosphere
  2. Atmosphere
  3. Hydrosphere
  4. Lithosphere


Microorganisms, although they grow in the topsoil(lithosphere), they are a part of living things that belongs to the biosphere.

The correct answer is: Biosphere

    • The lithosphere consists of the brittle upper section of the mantle and the crust, the Earth's outermost layers. It is bordered above by the atmosphere and below by the asthenosphere (another section of the upper mantle).
    • Microorganisms are the basis of the biosphere, both evolutionarily and ecologically. Microorganisms were the first organisms on Earth, having existed for at least 3.7 billion years of the planet's 4.6 billion-year lifetime.