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Photosynthesis Photosynthesis: An Overview. Photosynthesis Plants use sunlight to convert water (H 2 O) and carbon dioxide (CO 2 ) into high energy carbohydrates,

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Presentation on theme: "Photosynthesis Photosynthesis: An Overview. Photosynthesis Plants use sunlight to convert water (H 2 O) and carbon dioxide (CO 2 ) into high energy carbohydrates,"— Presentation transcript:

1 Photosynthesis Photosynthesis: An Overview

2 Photosynthesis Plants 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: Other carbon based sugars like ribose, sucrose, cellulose, etc. Starches NOTE: Oxygen (O 2 ) is a waste product. Plants obtain the CO 2 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 – Joseph Priestly concluded plants release a substance that can keep a candle burning – 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 5 th grade) Carbon dioxide + water sugars + oxygen light CO 2 +6H2OH2O6O2O2 C 6 H 12 O 6 +6 Balanced ?Now Balanced ?

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

6 Heres 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!!!... I mean C 6 H 12 O 6 (Ahemmmmm....)

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

9 So... Who are the playas? (thats ghetto talk for players!)

10 Let There Be Light... The main Playa! Photosynthesis uses the energy of sunlight to convert CO 2 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 suns 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 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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