1. Photosynthesis
By-
Shubham Goel
10th A

2. PHOTOSYNTHESIS
• It is anabolic process in which plant
produces glucose as a food and o2 is
liberated out a biproduct.
• Stored as carbohydrate in their bodies.
6Co2+12h2O
C6H12O6+6O2+6H2O

3. Photosynthesis occurs in two phases
1 Light reaction
2
Dark reaction

4. Light Reaction
The Reaction which take place
only in presence of sunlight.

5. Process of Light Reaction
1 Entering of water into stroma from
mesophyll cell
2 Absorption of light by Thylakoids

6. 3 Splitting of water into H+ and OH4 4 molecules of OH combine to form
water and Oxygen which is liberated out as
a biproduct.
5 The H+ reduces NADP to form NADPH to
form ATP.
.

7. Dark reaction
The reaction which can
take place in both
presence and absence of
sunlight.

8. Process of Dark Reaction
1 The CO2 enters through stomata ad
reaches to the stroma of mesophyll cell.
2 The CO2 reacts with Ribulose 1,5
bisphosphate present in stroma to form
phosphoglyceric acid.
3 In the presence of enzyme RUBP
carboxylase, the PGA undergo different
Biochemical reaction with NADPH and ATP
to form glucose.

9. Dark reaction

10. Mechanism of photosynthesis
1. Absorption of light by thylakoids.
2. Formation of O2 as a biproduct and
Assimilatory power.
3. CO2 react with assimilatory power
and goes under biochemical
reactions to form glucose.

11. Factors responsible for rate of photosynthesis
1 CO2 - If concentration of CO2 is higher than ,rate of
photosynthesis wiil increase for some time but decline
afterwards.
2 H2O- If the concentration of H2O is higher
than rate of photosynthesis will increase for some time
and decline afterwards.
3 Chlorophyll- Due to increase in amount of chlorophyll
the rate of photosynthesis will only increrse and will
not come down.
4 Sunlight- The enzyme which is responsible for
photosynthesis is ph. The ph enzyme work in the 25 to
35 C. and due to more heat the temperature goes
above 35 C and rate of photosynthesis goes down.