Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.



Published on

Here we have described what photosynthesis is. We have gone through different phases of photosynthesis as well as different cycles of photosynthesis used by different plants

Published in: Environment
  • Be the first to comment

  • Be the first to like this


  1. 1. The chemical process through which plants and other organisms produce carbohydrates with help chlorophyll and sunlight and releases oxygen as a by product
  2. 2. 6CO2+12 C6H12O6+6O2+6
  3. 3. What needs for Photosynthesis? Carbon dioxide Water Light Chlorophyll
  4. 4. Plants takes carbon dioxide using stomata. Sometimes they intake using lenticel and cuticle and eventually pass to chlorophyll of mesophyll cells
  5. 5. They take water from soil using roots and pass to each cell
  6. 6. Lights are made of photon, which are individual packets of electromagnetic energy travelling in waves
  7. 7. Pigments are a class of molecule that absorbs photons with particular wavelengths
  8. 8. Chlorophyll a Chlorophyll b Carotenoids Xanthophylls Anthocyanin Phycobilins
  9. 9. They absorb some colors and reflect other. We see the reflected ones
  10. 10. Light Dependent phase Light Independent phase
  11. 11. Needs sunlight Produces NADPHTakes place inside thylakoid membrane
  12. 12. Produces Oxygen Produces ATP
  13. 13. Photosystems(Reaction centers)gets boost of photon energy from light harvesting cluster and loses electron. Electron moves through electron transport chain
  14. 14. The freed electron are used in formation of NADPH from NADH+
  15. 15. a. Ps-II (p680) gets photon energy from light harvesting cluster and loses electron. b. Electrons move through ETC and loses energy with each transfer and end up in Ps-I (p700)
  16. 16. c. Ps-I (p700) gets photon energy from light harvesting cluster and loses e-. The freed e- along with H2 are used to form NADPH from NADH+ d. ETC H+ Thylakoid compartment e.H2O H+ +O2+ e- H+ concentration and electron gradient across the membrane are tapped for ATP formation
  17. 17. Electrons lost from Ps-I are replaced from Ps-II . Electrons lost from Ps-II are replaced by Water Finally: Both ATP and NADPH forms
  18. 18. a. Ps-I gets a boost of photon energy from a light harvesting cluster and loses one e- b. The electron passes from one molecule to other in ETC that is embedded in thylakoid membrane In each transfer it loses energy and ends up being reused by Ps-I
  19. 19. H+ Thylakoid membrane Electrons ferry H+ Electrochemical gradient ADP + Pi= ATP ATP synthase Finally, Only ATP forms But no NADPH
  20. 20. 4H2O+2ADP+2Pi+2NADP Light Chlorophyll 2H2O+2ATP+2O2+2NADPH2
  21. 21. No sunlight is needed Carbon fixation Uses ATP and NADPH
  22. 22. The process of securing carbon from the environment by incorporating it in a stable organic compound is called carbon fixation
  23. 23. CO2 gets into leaf and attach to Ribulose Bisphosphate (RuBP) ,a 5 carbon compound using Rubisco enzyme Turns into 6 carbon compound
  24. 24. 6C 3C Phosphoglycerate (PGA) 3C Phosphoglycerate (PGA)
  25. 25. 3C Phosphoglycerate (PGA) NADPH2 ATP ADP NADP Phosphoglyceraldehyde (PGAL)Pi E-
  26. 26. 10 PGAL 12 PGAL 2 PGAL 1 Pi Glucose Goes Back to cycle
  27. 27. Glucose 10 PGAL Sucrose, Starch, Cellulose Pi ATP ADP RuBP
  28. 28. Fix Carbon twice no matter how much O2 Oxaloacetate,4 Carbon compound is the first stable form Delivers CO2 to bundle sheath cells where it enters C3 pathway
  29. 29. Paddy Maize Pineapple
  30. 30. Open stomata in night and fix carbon by repeated turns of C4 cycle Runs C3 cycle in the next day
  31. 31. Factors of photosynthesis Light CO2 Temperature Water O2Minerals