List the events that occur during photosynthesis. explain the role of stomata in this process.

Photosynthesis is important as plants which are autotrophs prepare their own food through this process and all other heterotrophs have to depend on plants for their nutrition. So, photosynthesis is the ultimate source of nutrition in living beings. 

The process of photosynthesis occurs in two phases – the light reactions and the dark reactions.

Light reactions – As the name suggests, this reaction takes place in the presence of light. Light energy is absorbed by chlorophyll molecules and is utilized for splitting water molecules into hydrogen and oxygen. Additionally in this phase, assimilatory power in the form of ATP and NADPH2 are produced.

Light reactions occur in the membranes of thylakoids.

Events occurring during light reactions:

  • Absorption of light energy by chlorophyll molecules

  • Splitting of water molecules into hydrogen and oxygen atoms

  • Formation of ATP and NADPH2

Dark reactions – This reaction does not require direct light and occurs in the stroma of chloroplasts. During this phase, ATP and NADPH2 (formed during light reactions) are utilized for the reduction of CO2 to carbohydrates (food).

Event occurring during dark reaction:

Reduction of CO2 to form carbohydrates

Role of stomata

  1. The stomata helps in intake of CO2 and release of O2.
  2. It also helps in transpiration that pulls water from roots needed for photosynthesis.

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The three events that occur during the process of photosynthesis are:
(i) Absorption of light energy by chlorophyll. 
(ii) Conversion of light energy to chemical energy and splitting of water molecules into hydrogen and oxygen.
(iii) Reduction of carbon dioxide to STARCH.
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