(a) Draw the cross section of a leaf and label the following parts :

(i) upper epidermis (ii) chloroplast(b) Define photosynthesis. List three events which occur duringphotosynthesis. Write chemical equation involved duringphotosynthesis

(b) Photosynthesis is the process by which chlorophyll-containing cells synthesize food in the form of carbohydrates form carbon dioxide and water using sunlight.

Therefore, the raw materials required for photosynthesis are CO2 and H2O and the products formed are carbohydrates and 


Hence, the process can be represented as:

The three major events that occur during photosynthesis are:

  • 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.

  • 2
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