photosynthesis
TRANSCRIPT
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Shree krishna pranami public school
Shree krishna pranami public school By-
Shubham Goel
10th A
By-
Shubham Goel
10th A
Photosynthesis
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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
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Photosynthesis occurs in two phases
1 Light reaction
2 Dark reaction
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Light Reaction
The Reaction which take place only in presence of sunlight.
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Process of Light Reaction1 Entering of water into stroma from
mesophyll cell
2 Absorption of light by Thylakoids
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3 Splitting of water into H+ and OH-
4 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.
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Dark reaction
The reaction which can take place in both
presence and absence of sunlight.
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Process of Dark Reaction1 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.
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Dark reaction
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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.
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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 higherthan 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.
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Thank you for giving your precious time to our
presentation