1 / 23

Photosynthesis

Photosynthesis. Chapter 8. Vocabulary—Breaking Down the Definitions. Photosynthesis Pigment Chlorophyll Thylakoid Stroma NADP+ Light Dependent Reactions ATP Synthase Calvin Cycle. Photosynthesis—What Do We Already Know?. Photosynthesis Brain Pop.

regina
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 Chapter 8

  2. Vocabulary—Breaking Down the Definitions • Photosynthesis • Pigment • Chlorophyll • Thylakoid • Stroma • NADP+ • Light Dependent Reactions • ATP Synthase • Calvin Cycle

  3. Photosynthesis—What Do We Already Know?

  4. Photosynthesis Brain Pop

  5. Chemical Equation—Quiz on this Next Meeting! 6 6

  6. Photosynthesis • Photosynthesis uses the energy of sunlight to convert water and carbon dioxide into oxygen and high-energy sugars.

  7. Light and Pigments • In addition to water and carbon dioxide, photosynthesis also requires LIGHT and CHLOROPHYLL. • CHLOROPHYLL= a molecule within a chloroplast • Chlorophyll is a pigment that absorbs light

  8. IVF to Analyze the Graph!

  9. 2 Stages of Photosynthesis

  10. Inside a Chloroplast • Photosynthesis takes place inside a chloroplast • The chloroplast contains saclike membranes called THYLAKOIDS • THYLAKOIDS are arranged in stacks called GRANA • The Chlorophyll is inside the thylakoids • The STROMA is the region outside of the thylakoids

  11. Light Reactions • The first stage of photosynthesis is the LIGHT REACTIONS. • Light is absorbed by the chloroplasts • Light Energy is converted to Chemical Energy (stored in ATP and NADPH)

  12. Light Reactions Continued • Oxygen is given off during this reaction. --Leaf Demo-- • Chlorophyll in the chloroplast contains pigments (compounds that absorb light) that absorb a lot of blue and red light but reflect green light (giving plants their green color.

  13. Light Reactions Continued • An oxidation reaction takes place, losing electrons and the primary electron acceptor takes on the lost electrons in a reduction reaction. • The primary electron acceptor donates the electrons to a series of molecules in the thylakoid membrane of the chloroplast.

  14. Oxygen as Byproduct Demo

  15. Label the diagram

  16. Dark Reactions/Calvin Cycle • In the second set of reactions in photosynthesis plants use the energy that was stored in ATP and NADPH during the light reactions to produce sugars. • Most common way this is done is called the CALVIN CYCLE. • Calvin Cycle Song!

  17. 4 Steps of the Calvin Cycle Step 1 • 3 CO2 molecules diffuse into the stroma and combine with a 5-Carbon molecule, RuBP. This molecule is very unstable and it quickly splits into 2 3-Carbon molecules called 3-PGA. • Each 3-PGA is converted into another 3 Carbon molecule, G3P after receiving a phosphate group from ATP and a proton from NADPH. Step 2

  18. 4 Steps of the Calvin Cycle Step 3 • One of the G3P molecules leave the Calvin Cycle to make carbohydrates which are stored for later use. • The remaining 3GP molecules are converted back into RuBP by adding phosphate groups from ATP and then the Calvin Cycle begins again. Step 4

  19. Step 1—3 CO2 molecules combine to form RuBP (6 carbon molecule) which splits into 3 PGA Step 4– The rest of the G3P is converted back into RuBP/Rubisco Calvin Cycle Step 3– One molecule of G3P leaves the cycle to make sugars Step 2—Each molecule of 3 PGA is converted to G3P

  20. Factors Affecting Photosynthesis • Water, Temperature, Intensity of Light all affect the rate of photosynthesis

  21. Thinking Visually • Complete the flowchart on page 216 of your book.

  22. Investigation Photosynthesis

More Related