1 / 16

Photosynthesis in Overview

Photosynthesis in Overview. Process by which plants and other autotrophs store the energy of sunlight into sugars. The energy from the sun is converted into the chemical energy of glucose. Requires sunlight, water, and carbon dioxide. Overall equation:

susanstone
Télécharger la présentation

Photosynthesis in Overview

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 in Overview • Process by which plants and other autotrophs store the energy of sunlight into sugars. • The energy from the sun is converted into the chemical energy of glucose. • Requires sunlight, water, and carbon dioxide. • Overall equation: 6 CO2 + 6 H20  C6H12O6 + 6 O2 • Occurs in the leaves of plants in organelles called chloroplasts.

  2. Chloroplast Structure • Inner membrane of the thylakoid is called the thylakoid membrane. • Thickened regions called thylakoids. A stack of thylakoids is called a granum. (Plural – grana) • Stroma is a liquid surrounding the thylakoids.

  3. Photosynthesis: The Chemical Process • Occurs in two main phases. 1. ‘Light’ Dependent Reactions. 2. Light Independent Reactions (aka – the Calvin Cycle, Dark reactions). • Light reactions are the “photo” part of photosynthesis. Light is absorbed by pigments. • Dark reactions are the “synthesis” part of photosynthesis. Glucose is produced during this stage.

  4. The Reactions of Photosynthesis

  5. Light Dependent Reactions • Light-dependent reactions occur in the grana. • Light and water are required for this process. • Energy molecules are formed. (ATP and NADPH). These molecules power the dark reactions. • Photolysis occurs. This is the splitting of water molecules. • Oxygen gas is made as a waste product.

  6. Light Independent Reactions • Dark reactions (light-independent) occur in the stroma. • ATP and NADPH molecules created during the light reactions power the production of glucose. • Carbon dioxide is “fixed” into Phosphoglyceraldehyde (PGAL). • 2 PGAL’s come together to form glucose.

  7. Pigments • Chlorophyll A is the most important photosynthetic pigment. Green! • Other pigments accessory pigments are also present in the leaf. • Chlorophyll B (yellow-green) • Carotenoids (yellow-orange). • Xanthophylls (yellow).

  8. Chromatography • A technique used to separate the component parts of a mixture according to how well each part dissolves within a solvent. • The more soluble a part is, the farther it will travel up the chromatography paper. • Allows scientists to observe parts of a mixture that they would otherwise be unable to see.

  9. Do Now • Wash hands. • Wash test tube and flask at your desktops. • Put all materials away and tucked under your desk with the exception of a pencil, pen and lab packet. • Lab # 9: Analysis of Plant Pigments

  10. Do Now • Follow lab steps a through d. • Raise your hand for plant pigment solution. • Complete steps e through h.

  11. Do Now • Get a pair of goggles. • Get solvent from Mrs. Muraco • Follow steps j and k. Be sure to record the time.

  12. Do Now • Step m. • Record the time. • Answer questions 3-9. • Complete calculations. • Fill in table. • Answer 1-3. • Label pigments and Rf values and hand in lab.

More Related