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Photosynthesis

Photosynthesis. Photosynthesis: An Overview. Photosynthesis. Plant’s use sunlight to convert water (H 2 O) and carbon dioxide (CO 2 ) into high energy carbohydrates, mainly glucose (C 6 H 12 O 6 ), and oxygen (O 2 ). Other examples of high energy carbohydrates include:

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Photosynthesis

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  1. Photosynthesis Photosynthesis: An Overview

  2. Photosynthesis • Plant’s use sunlight to convert water (H2O) and carbon dioxide (CO2) into high energy carbohydrates, mainly glucose (C6H12O6), and oxygen (O2). • Other examples of high energy carbohydrates include: • Other carbon based sugars like ribose, sucrose, cellulose, etc. • Starches • NOTE: Oxygen (O2) is a “waste” product. • Plants obtain the CO2 they need from the air or from the water (aquatic plants) in which they grow. • Example: kelp, Anacharis sp., Elodea sp., Cabamba sp. • Plants also use the sugar they make as an energy source to produce complex carbohydrates such as starches.

  3. Photosynthesis: The Early Years • 1643 – Jan van Helmont concluded trees gain most of their mass from water. • 1771 – Joseph Priestly concluded plants release a substance that can keep a candle burning. • 1779 – Jan Ingenhousz concluded that plants need sunlight to produce oxygen. • Those 3, plus others, finally discovered that in the presence of light plants transform carbon dioxide and water into carbohydrates while releasing oxygen.

  4. Photosynthesis: The Elementary School Years(Or what I should have learned in 5th grade) Carbon dioxide + water sugars + oxygen light light 6 CO2 + 6 H2O C6H12O6 + 6 O2 Now Balanced ? Balanced ?

  5. Now, where in the “cell” does all this take place?

  6. Here’s Where. . . * In the leaf of every autroph * Through the stomates * Into every cell * Into the thousands of chloroplasts * On the grana of each chloroplast (TEM of grana) * On each thylakoid of every grana

  7. NOTHIN’ BUT NET!!! (Ahemmmmm . . . .) . . . I mean C6H12O6

  8. The Sequel . . .Every Autotroph in the World!!

  9. So . . . Who are the playas? (that’s ghetto talk for “players!”)

  10. Let There Be Light . . . The main Playa! • Photosynthesis uses the energy of sunlight to convert CO2 into sugar and oxygen. • Light comes in various “wave-lengths” making up the visible spectrum of all colors • Remember my friend Roy G Biv?

  11. Chlorophyll . . . Another playa! • Chlorophyll (the “filling”) inside of each chloroplast predominantly absorbs the blue-violet to red colors of the spectrum very well and reflects the green color. That is why leaves appear green. • Plants gather the sun’s energy with light absorbing pigments . . . Predominantly chlorophyll a and chlorophyll b • Any compound that absorbs light, absorbs the energy in light!! • When chlorophyll absorbs sunlight, much of the energy of the light is transferred directly to the electrons in the chlorophyll molecule, And when those electrons have their energy level raised . . . Whoooaaaaa . . . Every molecule gets excited . . . And when molecules get excited . . . crazy things start happening!! (to be continued)

  12. Home Preparation • Read pages 204 - 207 • Find 3 examples of aquatic plants other than those listed in lecture and give their Genus species • Get a picture and state the organisms habitat • This must be typed!! • Study for pfe 8-2

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