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Our Environment

  • Our earth consists of following parts 

  • Lithosphere – solid outer covering of the Earth

  • Hydrosphere – consists of water that is found in oceans, seas, rivers, lakes, etc.

  • Atmosphere – the layer of air that surrounds the Earth



  • Environment-natural surroundings and external conditions of an organism, which include all living and non-living factors that affect the organism
  • Organism- is the basic unit of an ecological hierarchy, can be unicellular such as Amoeba and paramecium or multicellular such as humans
  • Population- a group of individuals of the same species inhabiting a given geographical area at a particular time and functioning as a unit
  • Community- includes all individuals of different species living within a certain geographical area
  • Ecosystem- includes both living and non-living components of an area
  • Biosphere- The sum total of all ecosystems and their interactions


Components of an ecosystem

  • Abiotic factors- non living components like light, temperature, water…

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