1 / 11

Photosynthesis & Cellular Respiration

Photosynthesis & Cellular Respiration. Introduction to Photosynthesis. Photosynthesis (to make using light)—the process by which autotrophs convert sunlight to a usable form of energy…sugar. Plants also carry out cellular respiration, but they do not have to “eat” sugar. Sunlight.

Download Presentation

Photosynthesis & Cellular Respiration

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 & Cellular Respiration

  2. Introduction to Photosynthesis • Photosynthesis (to make using light)—the process by which autotrophs convert sunlight to a usable form of energy…sugar. • Plants also carry out cellular respiration, but they do not have to “eat” sugar.

  3. Sunlight • Is a mixture of visible wavelengths. The different wavelengths are different colors and carry different amounts of energy • Spectrum of visible colors. • (Longest) ROY G. BIV (shortest) • Light is either absorbed (black), transmitted, or reflected (the color you see) • The sun’s energy is trapped by plant pigments (chlorophyll).

  4. Chlorophyll • Types of Chlorophyll • Chlorophyll a—main pigment that traps light; reflects blue-green; absorbs red • Chlorophyll b—reflects yellow-green. • Carotenoids—reflects red, orange, yellow (squash, carrots)

  5. Leaf Structure • epidermis—row of cells on the top & bottom • cuticle—waxy covering on upper surface • stomata—pores on the underside of leaf where gases are exchanged • mesophyll (middle leaf)—where the chloroplasts are located • Chloroplast—organelle containing chlorophyll; where photosynthesis occurs

  6. Chloroplast structure • Chloroplast structure—has two surrounding membranes & 2 inner parts • Thylakoids—disc shaped membrane sacs arranged in stacks…think of coins on top of each other • Grana (Granum)—stacks of thylakoids • Stroma—gel like material surrounding grana

  7. Photosynthesis • PHOTOSYNTHESIS • Two parts: • Light Reaction (light dependent)—occurs in the thylakoids and must have light; “photo” • Dark Reaction (light independent)—occurs in the stroma without light; “synthesis” • H2O + CO2 + Sunlight C6H12O6 + O2

  8. Parts of the chemical equation •  Reactants—what you “put in” to the equation; usually on the left of the yield arrow • Yield arrow—an arrow that shows the direction of the equation • Products—the end result of your equation; usually on the right side of the yield arrow. What you make.

  9. Light Reaction: • Requires energy from sun and water • Splits (breaks covalent bonds) water to release oxygen ( O2 ) and some energy (H+) • This energy is stored as ATP and NADPH

  10. Dark Reaction (Calvin Cycle): • 1. Requires CO2 , sugar, enzymes, and energy (ATP & NADPH) • 2. It does not require sunlight • 3. Takes CO2 (from air) plus ATP (from light reaction) and converts them into glucose.

More Related