Living Organisms and Life Processes




  1. Absorption of light energy by chlorophyll.
  2. Conversion of light energy to chemical energy and splitting of water molecules into hydrogen and oxygen.
  3. Reduction of carbon dioxide to carbohydrates.


Water used in photosynthesis is taken up from the soil by the roots of terrestrial plants. Other materials like nitrogen, phosphorus, iron, and magnesium are taken up from the soil. Nitrogen is an essential element used in the synthesis of proteins and other compounds.


Stomata are tiny pores present on the surface of the leaves.

Stomata does the exchange of large amounts of gases (O2/CO2)

Stomata is responsible

Large amounts of water are lost through the stomata.


The opening and closing of the pore are functions of the guard cells. The guard cells swell when water

flows into them, causing the stomatal pore to open. Similarly, the pore closes if the guard cells shrink.

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Life Processes part 3 (Inter relation of life processes) [00:05:23]

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