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Download Photosynthesis - Issaquah Connect
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Good Morning! Tuesday, 3/14 Revisiting Photosynthesis Photosynthesis Review https://www.youtube.com/watch?v=JJxZH_ Y5D4s How is Carbon emitted into the atmosphere? Respiration Burning of Fossil Fuels Coal Oil Natural gas Decomposition When in the soil, bacteria and fungi break down detritus (dead plant and animal life) and carbon dioxide is released into the atmosphere. How is Carbon absorbed from the atmosphere? Photosynthesis Diffusion into the surface ocean The surface ocean absorbs more carbon dioxide than land Storage in soil and deep ocean from dead and decaying plant and animal life Carbon circulates from the surface ocean down to the deep ocean Detritus (dead and decaying marine life) collects in the deep ocean where carbon can be stored for hundreds of years. THE SUN: MAIN SOURCE OF ENERGY FOR LIFE ON EARTH AN OVERVIEW OF PHOTOSYNTHESIS Photosynthesis is the process by which autotrophic organisms use light energy to make sugar and oxygen gas from carbon dioxide and water. Carbon dioxide Water Glucose PHOTOSYNTHESIS Oxygen gas Light Energy Harvested by Plants 6 CO2 + 6 H2O + light energy → C6H12O6 + 6 O2 Food Chain THE FOOD WEB WHY ARE PLANTS GREEN? Plant cells have green chloroplasts The thylakoid membrane of the chloroplast is impregnated with photosynthetic pigments (i.e., chlorophylls, carotenoids). THE COLOR OF LIGHT SEEN IS THE COLOR NOT ABSORBED Chloroplasts absorb light energy and convert it to chemical energy Light Reflected light Absorbed light Transmitted light Chloroplast Chloroplasts: Sites of Photosynthesis Photosynthesis Occurs in chloroplasts, organelles in certain plants All green plant parts have chloroplasts and carry out photosynthesis The leaves have the most chloroplasts The green color comes from chlorophyll in the chloroplasts The pigments absorb light energy The Location and Structure of Chloroplasts Chloroplast LEAF CROSS SECTION MESOPHYLL CELL LEAF Mesophyll Stomata CHLOROPLAST Intermembrane space Outer membrane Granum Grana Stroma Inner membrane Stroma Thylakoid Thylakoid compartment How does Carbon get back to the Atmosphere? Animals Eat Plants When organisms eat plants, they take in the carbon from the plant. Some of it becomes part of their own bodies. Some of it will be released to the atmosphere. How does Carbon get back to the Atmosphere? This process is called “Respiration!” Equation: Food + Oxygen Carbon Dioxide + Water C6H12O6 + O2 CO2 + H20 How does Carbon get back to the Atmosphere? The Goal of “Respiration” is to break down glucose and release energy for cell processes. • Since all living organisms need this energy, all living organisms do respiration…even plants!!! Where in the cell does Respiration take place in the cell? This happens in a structure in the cell called the mitochondria.
