Photosynthesis and plants
This presentation is the property of its rightful owner.
Sponsored Links
1 / 12

Photosynthesis and Plants PowerPoint PPT Presentation


  • 71 Views
  • Uploaded on
  • Presentation posted in: General

Photosynthesis and Plants. 6CO 2 + 6H 2 O + sunlight C 6 H 12 O 6 + 6O 2 Epidermis with cuticle palisade mesophyll – parenchymal cells – primary sites of photosynthesis Spongy mesophyll – CO2 exchange Vascular bundles – xylem and phloem for water and sugar transport

Download Presentation

Photosynthesis and Plants

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Photosynthesis and plants

Photosynthesis and Plants

  • 6CO2 + 6H2O + sunlight C6H12O6 + 6O2

  • Epidermis with cuticle

  • palisade mesophyll – parenchymal cells – primary sites of photosynthesis

  • Spongy mesophyll – CO2 exchange

  • Vascular bundles – xylem and phloem for water and sugar transport

  • Lower epidermis with stomata and guard cells


Cross section of leaf

Cross section of leaf


Chloroplast anatomy

Chloroplast anatomy


Reactions of photosynthesis

Reactions of Photosynthesis

  • Light reactions

  • Dark reactions – Calvin cycle


Light reaction

Light Reaction

  • Photons strike thylakoid membrane activating chlorophyll and electrons from water

  • Excited electrons move down electron transport chain

  • ATP and NADPH are produced


Antenna complex

Antenna complex

  • Chlorophyll a, b, and carotenoids

  • Pigments gather light

  • Reaction ctr. “excites” electrons

  • light reactions


Non cyclic photophosphorylation

Non-cyclic Photophosphorylation


Cyclic photophosphorylation

Cyclic Photophosphorylation

  • Simple way to create ATP

  • Photons absorbed in PS I (700)

  • Electrons excited

  • Passed down cytochrome ETS

  • ATP generated, electrons passed back to PS I

  • No NADPH

  • No photolysis


Dark reactions

Dark Reactions

  • Use ATP, CO2, and NADPH to create sugars

  • Calvin cycle


Photorespiration

Photorespiration

  • Rubisco reduces the CO2 concentration then starts to bind oxygen

  • C4 alternative – CO2 combines with PEP to form oxaloacetate (4 Carbon sugar)

  • PEP carboxylase (enzyme that catalyzes C4 rxn.) has high affinity for CO2.

  • Oxaloacetate converts to malate and shuttled to bundle sheath cells

  • CO2 released for use in Calvin cycle


C 4 photosynthesis

C4 photosynthesis


Cam photosynthesis

CAM photosynthesis


  • Login