photosynthesis

Information about photosynthesis

Published on July 19, 2008

Author: bharatg92

Source: authorstream.com

Content

Slide 1: P H O T O S Y N T H E S I S ( LIGHT ) ( PUTTING TOGETHER ) Slide 2: Table Of Contents OVERVIEW SIGNIFICANCE RAW MATERIALS 4. MECHANISM OF PHOTOSYNTHESIS 5. PHOTOSYNTHESIS IN MARINE PLANTS 6. EVOLUTION OF PHOTOSYNTHESIS 7. FUTURE OF PHOTOSYNTHESIS Slide 3: If we carefully observe the food web we find that the critical source of food is the plant. Not only food but oxygen required for aerobic respiration is also produced by plants. Significance Of Photosynthesis Slide 4: Photosynthesis is the conversion of light energy into chemical energy by living organisms. A commonly used but simplified equation for photosynthesis is: 6CO2 + 12H2O + Photons C6H12O6 + 6O2 + 6H2O OVERVIEW Slide 5: RAW MATERIALS LIGHT (PHOTON) 2 .CARBON DIOXIDE 3 .WATER Slide 6: EXCHANGE OF CARBON-DIOXIDE The exchange of gases takes place in stomata, in leaves & in lenticels, in the bark of trees through the process of diffusion. Slide 7: ABSORBTION OF LIGHT Plants absorb light primarily using the pigment chlorophyll, supported by other accessory pigments Chlorophyll Molecule Carotenoids Slide 8: The plants absorb water and minerals from the soil by means of roots. The Transpiration Pull Theory - 1. Cohesion 2. Tension ABSORBTION OF WATER Slide 9: LIGHT REACTION ( HILL REACTION ) WATER PHOTOLYSIS DARK REACTION (CALVIN-BENSON CYCLE) MECHANISM OF PHOTOSYNTHESIS Slide 10: LIGHT REACTION Light energy is converted to chemical energy through the light dependent reaction(Hill reaction). The products of the light reaction are ATP and NADPH. Slide 11: WATER PHOTOLYSIS Photosystem II includes the first step of Z scheme, an external source of electrons is required, which is water. Slide 12: The fixation of carbon dioxide is a light independent process. Carbon dioxide combines with a 5 - carbon sugar, Ribulose 1, 5-bisphosphate(RuBP). DARK REACTION Slide 13: In marine plants, phycobilins( the accessory pigment ) peak for absorbing blue green light which allow them to grow in deeper water. PHOTOSYNTHESIS IN MARINE PLANTS Slide 14: Oxygen in the atmosphere exists due the evolution of oxygenic photosynthesis, also called oxygen catastrophe. EVOLUTION OF PHOTOSYNTHESIS Slide 15: What The Future Holds Artificial photosynthesis - the next breakthrough in science promises to be able to mimic the water splitting process in labs Artificial systems will use metals such as ruthenium and iron to capture light. Slide 16: Some factors affect the rate of photosynthesis in plants, as follows: 1. Temperature 2. Light Intensity 3. Carbon Dioxide concentration LIMITING FACTORS OF PHOTOSYNTHESIS Slide 17: Ayush Verma Bharat Gupta Arhan Sibal Special thanks to- Mrs. Vineeta Colaso Acknowledgements

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