PhotosynthesisPhotosynthesis

Process of plants Process of plants using light energy using light energy to produce glucoseto produce glucose

To put together To put together using lightusing light

Chemical EquationChemical Equation

COCO22 + H + H22O O C C66HH1212OO6 6 + O+ O22

Requires lightRequires light Requires chloroplastsRequires chloroplasts

ReactantsReactants

COCO22 + H + H22OO

Carbon Dioxide (COCarbon Dioxide (CO22))

About .03% of About .03% of the atmospherethe atmosphere

SourcesSources– RespirationRespiration– BurningBurning– DecompositionDecomposition

Enters plant leaf Enters plant leaf through stomatethrough stomate

Water (HWater (H22O)O)

Enters the plant Enters the plant root system (root root system (root hairs) by osmosishairs) by osmosis

Travels through Travels through xylem from the from the roots to the roots to the leavesleaves

Transpiration- Transpiration- evaporation of evaporation of water from leaveswater from leaves

EnergyEnergy

LightLight- small portion - small portion of the EM spectrumof the EM spectrum

ROY G. BIVROY G. BIV Blue, Violet, Red Blue, Violet, Red

used most by leafused most by leaf

ChloroplastsChloroplasts

Photosynthetic Photosynthetic organelles found in organelles found in certain leaf cells, certain leaf cells, contains the contains the pigmentspigments

Primary PigmentsPrimary Pigments

Visible during the Visible during the growing seasonsgrowing seasons

– chlorophyll a- chlorophyll a- greengreen

– chlorophyll b- chlorophyll b- greengreen

Secondary PigmentsSecondary Pigments

Not visible during Not visible during the growing the growing season season

Hidden by the Hidden by the primary pigmentsprimary pigments

Become visible in Become visible in the fall of the the fall of the yearyear

Secondary PigmentsSecondary Pigments

CarotenoidsCarotenoids– Carotene- orangeCarotene- orange– Xanthophyll-yellowXanthophyll-yellow– Anthocyamin- redAnthocyamin- red

Chloroplast StructureChloroplast Structure

Grana- stack of Grana- stack of tiny discs, contain tiny discs, contain the chlorophyllthe chlorophyll

– light reactionslight reactions take place here, take place here, light is requiredlight is required

Chloroplast StructureChloroplast Structure

Stroma- contains Stroma- contains enzymesenzymes– dark reactionsdark reactions

take place here, take place here, light not requiredlight not required

ProductsProducts

CC66HH1212OO6 6 + O+ O22

Glucose (CGlucose (C66HH1212OO66))

Formed in the Formed in the chloroplastschloroplasts

Transported Transported through vessels through vessels called phloemcalled phloem

Stored as Stored as carbohydrates in carbohydrates in roots, stems, roots, stems, leaves, fruit, leaves, fruit, seeds, etcseeds, etc

Oxygen (OOxygen (O22))

Released through Released through the stomata into the stomata into the atmospherethe atmosphere

Absorption of ChlorophyllAbsorption of Chlorophyll

P 115, Figure 6-5P 115, Figure 6-51. Look at chlorophyll a, what 1. Look at chlorophyll a, what

color of light is absorbed the color of light is absorbed the most? What is its wavelength?most? What is its wavelength?

2. Look at chlorophyll b, what 2. Look at chlorophyll b, what color of light is absorbed the color of light is absorbed the most? What is its wavelength?most? What is its wavelength?

Absorption of ChlorophyllAbsorption of Chlorophyll

3. Look at the carotenoids, what 3. Look at the carotenoids, what color of light is absorbed the most? color of light is absorbed the most? What is its wavelength?What is its wavelength?

4. Why are there no peaks between 4. Why are there no peaks between 540 nm and 640 nm?540 nm and 640 nm?

Absorption of ChlorophyllAbsorption of Chlorophyll

5. What colors are reflected most by 5. What colors are reflected most by the pigments?the pigments?

6. Arrange the colors in the spectra 6. Arrange the colors in the spectra for chlorophyll a & b in the order of for chlorophyll a & b in the order of their visiblity. List the most visible their visiblity. List the most visible 11stst

Absorption of ChlorophyllAbsorption of Chlorophyll

1. chlor. a abs- violet, 425 nm1. chlor. a abs- violet, 425 nm 2. chlor. b abs- blue, 460 nm2. chlor. b abs- blue, 460 nm 3. carot. Abs- blue-green, 475 nm3. carot. Abs- blue-green, 475 nm 4. The colors are being reflected.4. The colors are being reflected. 5. refl. most- green, yellow, orange5. refl. most- green, yellow, orange 6. order of visibility- 6. order of visibility-

green, yellow, orange, red, violet, blue green, yellow, orange, red, violet, blue

All images- Clip ArtAll images- Clip Art