Photosynthesis  Process of plants using light energy to produce glucose  To put together using light

Chemical Equation  CO 2 + H 2 O  C 6 H 12 O 6 + O 2  Requires light  Requires chloroplasts

Reactants  CO 2 + H 2 O

Carbon Dioxide (CO 2 )  About.03% of the atmosphere  Sources –Respiration –Burning –Decomposition  Enters plant leaf through stomate

Water (H 2 O)  Enters the plant root system (root hairs) by osmosis  Travels through from the roots to the leaves  Travels through xylem from the roots to the leaves  Transpiration- evaporation of water from leaves

Energy  Light- small portion of the EM spectrum  ROY G. BIV  Blue, Violet, Red used most by leaf

Chloroplasts  Photosynthetic organelles found in certain leaf cells, contains the pigments

Primary Pigments  Visible during the growing seasons –chlorophyll a- green –chlorophyll b- green

Secondary Pigments  Not visible during the growing season  Hidden by the primary pigments  Become visible in the fall of the year

Secondary Pigments  Carotenoids –Carotene- orange –Xanthophyll-yellow –Anthocyamin- red

Chloroplast Structure  Grana- stack of tiny discs, contain the chlorophyll –light reactions take place here, light is required

Chloroplast Structure  Stroma- contains enzymes –dark reactions take place here, light not required

Products  C 6 H 12 O 6 + O 2

Glucose (C 6 H 12 O 6 )  Formed in the chloroplasts  Transported through vessels called phloem  Stored as carbohydrates in roots, stems, leaves, fruit, seeds, etc

Oxygen (O 2 )  Released through the stomata into the atmosphere

Absorption of Chlorophyll  P 115, Figure 6-5  1. Look at chlorophyll a, what color of light is absorbed the most? What is its wavelength?  2. Look at chlorophyll b, what color of light is absorbed the most? What is its wavelength?

Absorption of Chlorophyll  3. Look at the carotenoids, what color of light is absorbed the most? What is its wavelength?  4. Why are there no peaks between 540 nm and 640 nm?

Absorption of Chlorophyll  5. What colors are reflected most by the pigments?  6. Arrange the colors in the spectra for chlorophyll a & b in the order of their visiblity. List the most visible 1 st

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

All images- Clip Art