the green machines
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Chap. 6Chap. 6
LecLec
(Photo=light & (Photo=light & SynthesisSynthesis = put = put together) together)
I.I. Energy Formation:Energy Formation:
A. Autotroph v. Heterotroph
1. examples:
B. Photosynthesis is a process of capturing & transforming light energy into chemical energy in the form of carbohydrates.
1. main pathway for carbon & energy
II. Photosynthesis Part 1
A. Light dependent reaction
1.Photons: packets of energy
travel in wavelengths
2. Wavelengths: distance traveled
a. short : high energy (violet)
b. long: low energy (red)
B. Electromagnetic Spectrum: represents full range of light energies & wavelengths.
ROYGBIV
1. sunlight: mixture of all visible wavelengths. All colors reflected evenly.
2. Reflection v. Absorption
a. photons not absorbed are reflected.
example:
Black object:
absorbs: ROYGBIV
reflects: none
White object:
absorbs: none
reflects: ROYGBIV
C. Photosynthetic Pigments:
1. Pigment: photosynthetic substance that absorbs photons.
a. chlorophyllchlorophyll=main pigment
appears green
2. Pigment types:
main
a. Chlorophyll a: green
absorbs mainly red & violet
accessory pigments
b. Chlorophyll b: green-yellow
c. Carotenes: brown-orange-yellow
d. Xanthophylls: yellow-brown-purple-blue
e. Phycobilins: red-blue-green
f. Anthocyanin: red-purple
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