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Photosynthesis:
• Light energy combines CO2 and H to make sugars.
• Performed by all photosynthetic autotrophs (photoautotrophs)– Cyanobacteria– Algae (and other protists)– plants
Relevance of photosynthesis
• Fixes carbon– Places carbon in a form that can be used by
organisms• Take carbon from inorganic molecules and puts it in organic
molecules (sugars)
– Base of food chain
• Removes CO2 from atmosphere
• Oxygenates the atmosphere
General Equation for Photosynthesis
CO2 + H20 ---------------- C6H12O6 + O2
• Substrate/inputs/starting materials• Obtained from environment • Products/ending materials
LightLight & pigment
Provides energy for process
Pigment = molecule that has color•Photosynthetic pigment absorbs light energy (capture light energy)•Absorbed light is captured•Non-absorbed light is reflected creating visible color of pigment
CHLOROPHYLL:IS MAIN PHOTOSYNTHETIC PIGMENT
General Equation for Photosynthesis
CO2 + H20 ----------- C6H12O6 + O2
• Substrate/inputs/starting materials• Obtained from environment • Products/ending materials
From Env:•Air•Water (that organisms lives in)
From Env:•Soil•Water (that organisms lives in)
Stays in organism•Broken down for energy•Used as building material
Released to Env.•Oxygenates air•Oxygenates water
General Equation for Photosynthesis
CO2 + H2O ----------- C6H12O6 + O2
White light is composed of many colors (wavelengths) of light mixed together
ROY G. BIVColor of pigment = color NOT absorbed
Absorbed v. reflected v. transmitted
Reflected light color of object (color object appears)
absorbed light energy captured my object/material
transmitted light also visible
The color you see is/are the reflected colors (wavelenths)
The colors you do NOT see are absorbed
Pigment absorption
A
B
What you should know• What kinds of organisms perform photosynthesis• The ecological relevance/importance of photosynthesis• The general equation for photosynthesis (including what are the starting and ending
materials)• Where each molecule involved comes from or what is done with it after it is created• How the atoms in the substrates and rearranged to make the products• The colors of the visible spectrum• The relationship between absorbed and reflected light and the color an object
appears and how much energy is made available for photosynthesis• What an accessory pigment is and why they are advantageous.• What wavelengths/colors of light chlorophyll absorbs (including which color(s) it
absorbs best/most)• How the experiment worked and the relationship the class determined existed
between light intensity and photosynthetic rate• Why co2 rich soln was used, why the heat shield was used.
HOW PLANTS WORK• Use Water (from ground), CO2, and sunlight energy to make food• WATER + CO2 SUGARS
– this is photosynthesis– This happens mostly in leaves (which also lose water)