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Oxygen and Carbon Dioxide Photosynthesis and Respiration Photosynthesis • Who provides the oxygen you breathe? – PLANTS! • Carry out PHOTOSYNTHESIS Photosynthesis – – – – – Definition: a process during which energy from the Sun is used to change carbon dioxide and water into glucose and oxygen Glucose: provides plants with energy Oxygen: released into atmosphere Carbon Dioxide + water + energy glucose + oxygen Respiration • Definition: process through which oxygen and glucose are combined to produce carbon dioxide and water – Stored energy is released – MOST ORGNISMS ARE ABLE TO USE THE ENERGY IN FOOD BECAUSE OF THIS!!! Respiration »Chemical equation – Glucose + oxygen carbon dioxide + water + energy Compare and Contrast • Respiration: – Glucose + oxygen carbon dioxide + water + energy • Photosynthesis: – Carbon Dioxide + water + energy glucose + oxygen Carbon cycle • Carbon goes through the process mostly through gas known as CARBON DIOXIDE – Plants take in carbon dioxide during photosynthesis • Carbon goes to the glucose in the plant • Organism that eats the plant gets the glucose • Organism gets rid of the Carbon… • BRAIN POP!! Carbon Cycle –Death of organisms: • Decomposition occurs: –Bacteria and fungi break down organic matter »Release carbon! Carbon Cycle –Fossil Fuels: burning them releases carbon into the atmosphere Oxygen Cycle – Oxygen produced during photosynthesis • Consumed during respiration – – – – Examples: water vapor Combustion Rusting Rocks weathering Disrupting the Cycles – HUMANS!!! • Adding too much carbon to atmosphere: – Burning fossil fuels: natural gas, coal, and oil • Deforestation: cutting down forests Homework! • 5-1 SG/Cycles wkst • Due Tomorrow!!!!