Plants can prepare their own food

1. PHOTOSYNTHESIS
1.LIGHT REACTION
 Light Reaction occurs in the grana of chloroplast.
 During this phase light energy is converted into
chemical energy and stored as ATP molecules.
 Water that reaches the leaf, splits into hydrogen and
oxygen in this phase.
 Oxygen evolved during this process is released by
plants and hydrogen molecules are utilized in the
second phase of photosynthesis.
2.DARK REACTION
 Sunlight is not utilized in this phase that occurs in
the stroma of chloroplast.
 Hydrogen is added to Carbondioxide to form
glucose using the energy of ATP molecules.
 Dark reaction follows the light reaction.
 This phase is also known as Calvin cycle.
ADENOSINE TRI PHOSPHATE

2. Availability of energy must be ensured for
continuous metabolic activities in the cells.
ATP molecule is used for the continuous
transfer of energy.
Adenosine Tri Phosphate is the expanded
form of ATP.
These molecules are known as the energy
currencies of the cell.
Life activities take place utilizing the energy
released as a result of breakdown of ATP into
ADP and Phosphate.