Photosynthesis (2.9) IB Diploma Biology
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1 Photosynthesis (2.9) IB Diploma Biology Essential Idea: Photosynthesis transforms light energy into chemical potential energy that can be used by organisms
2 2.9.1 Photosynthesis is the production of carbon compounds in cells using light energy. Transformation of Light energy (sunlight) into Chemical energy (carbon compounds)
3 2.9.4 Oxygen is produced in photosynthesis from photolysis of water. Photosynthesis occurs in two main stages in the chloroplasts of plant cells In the first stage, light energy is used to split (lyse) water into oxygen and hydrogen and make some ATP Oxygen gas is released into the atmosphere and Hydrogen atoms and ATP are the used to provide energy for the second stage of reactions The LIGHT DEPENDENT Reactions
4 2.9.5 Energy is needed to produce carbohydrates and other carbon compounds from carbon dioxide. The LIGHT INDEPENDENT Reactions (aka the Calvin Cycle) In the second stage, energy from ATP and Hydrogen is used to transform Carbon dioxide into Carbohydrates Process known as Carbon Fixation FUN FACT: The average tree absorbs 50 lbs of CO2 per year. Giant Redwoods can fix more than one TON of carbon in their lifetimes The enzyme Rubisco catalyzes this reaction series
5 2.9.5 Energy is needed to produce carbohydrates and other carbon compounds from carbon dioxide. Light Independent reactions occur in the Stroma Light Dependent reactions occur in the Thylakoids
6 2.9.5 Energy is needed to produce carbohydrates and other carbon compounds from carbon dioxide.
7 2.9.5 Energy is needed to produce carbohydrates and other carbon compounds from carbon dioxide.
8 2.9.5 Energy is needed to produce carbohydrates and other carbon compounds from carbon dioxide. Starch granules
9 2.9.5 Energy is needed to produce carbohydrates and other carbon compounds from carbon dioxide.
10 2.9.2 Visible light has a range of wavelengths with violet the shortest wavelength and red the longest.
11 2.9.3 Chlorophyll absorbs red and blue light most effectively and reflects green light more than other colors.
12 2.9.3 Chlorophyll absorbs red and blue light most effectively and reflects green light more than other colors.
13 Draw an absorption spectrum for chlorophyll and an action spectrum for photosynthesis.
14 Draw an absorption spectrum for chlorophyll and an action spectrum for photosynthesis.
15 Draw an absorption spectrum for chlorophyll and an action spectrum for photosynthesis.
16 Draw an absorption spectrum for chlorophyll and an action spectrum for photosynthesis.
17 2.9.9 Separation of photosynthetic pigments by chromatography. Chromatography is an method of separating out different pigment molecules based on their solubility It can be used to separate and distinguish chlorophyll and other accessory pigments, such as carotene and xanthophyll
18 2.9.6 Temperature, light intensity, and carbon dioxide concentration are possible limiting factors on the rate of photosynthesis.
19 2.9.6 Temperature, light intensity, and carbon dioxide concentration are possible limiting factors on the rate of photosynthesis.
20 2.9.6 Temperature, light intensity, and carbon dioxide concentration are possible limiting factors on the rate of photosynthesis.
21 2.9.6 Temperature, light intensity, and carbon dioxide concentration are possible limiting factors on the rate of photosynthesis.
22 2.9.6 Temperature, light intensity, and carbon dioxide concentration are possible limiting factors on the rate of photosynthesis.
23 2.9.8 Design experiments to investigate limiting factors on photosynthesis.
24 2.9.8 Design experiments to investigate limiting factors on photosynthesis.
25 2.9.7 Changes to the Earth s atmosphere, oceans, and rock deposition due to photosynthesis. Early Earth s reducing atmosphere contained negligible amounts of oxygen. The first prokaryotes emerged around 3.5 BYA, but it wasn t until about 2.2 BYA that oxygen levels rose to 2%. Known as the Great Oxidation Event Thanks, Photosynthesis!!
26 2.9.7 Changes to the Earth s atmosphere, oceans, and rock deposition due to photosynthesis. Thanks, Photosynthesis! Oxygen rise caused drops in Methane and CO2 (GHGs!) which corresponded with Earth s first glaciation. BRRR!
27 2.9.7 Changes to the Earth s atmosphere, oceans, and rock deposition due to photosynthesis. Corresponding oxidation of dissolved iron in the oceans allowed iron ore to precipitate, forming bands across the seafloor and providing a source of iron and steel to this day Thanks, Photosynthesis!
28 2.9.7 Changes to the Earth s atmosphere, oceans, and rock deposition due to photosynthesis. Thanks, Photosynthesis! and Aerobic Respiration! Oxygen rise to 20% atmospheric concentration around MYA allowed for the Cambrian Explosion of multicellular speciation
29 Bibliography / Acknowledgments Jason de Nys Chris Paine
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