1 / 19

Photosynthesis

Photosynthesis is the process that converts sunlight into chemical energy, forming the basis of food for all life on Earth. This intricate mechanism involves photoautotrophs, primarily plants, which use sunlight, carbon dioxide, and water to produce glucose and oxygen through the light reactions and the Calvin cycle. Key components include leaves, mesophyll, stomata, and chloroplasts—where chlorophyll plays a vital role in capturing light. Understanding this process includes exploring the splitting of water, redox reactions, and the importance of chemiosmosis and carbon fixation.

xia
Télécharger la présentation

Photosynthesis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Photosynthesis The beginning of all food on Earth

  2. Sunlight – the beginning

  3. Photoautotrophs Autotrophs Heterotrophs 6CO2 + 6H2O  C6H12O6 + 6O2

  4. Location, Location, Location • Leaves • Mesophyll • Stomata • Chloroplasts • Stroma • Thylakoids • Grana

  5. What’s Happening? • Splitting of Water • Redox • Light Reactions • Calvin Cycle

  6. Light Reactions: Overview • Convert solar to chemical energy • NADP+ = acceptor • Source = water • Chemiosmosis • ATP formation via photophosphorylation • Chlorophyll, in thylakoids

  7. Carbon Fixation • CO2 into CH2O (reduction) • Energy from: • NADPH • ATP • Calvin Cycle • Stroma

  8. Light Reactions: Up Close Spectrophotometer

  9. Light Reactions: Up Close Why leaves are green… Absorption spectrum Chlorophyll a Carotenoids

  10. Light Reactions: Photosystems

  11. Light Reactions: Noncyclic Flow

  12. Light Reactions: Cyclic Flow

  13. Light Reactions: Mechanical Analogy

  14. Chemiosmosis I

  15. Chemiosmosis II

  16. Calvin Cycle

  17. Photorespiration In light, [CO2] while [O2] ; Rubisco adds oxygen to Calvin cycle, releasing useless 2-C compounds.

  18. C4 and CAM Photosynthesis

  19. Photosynthesis: Summary

More Related