9-3 Cycles of Matter-Oxygen and Carbon

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Presentation transcript:

9-3 Cycles of Matter-Oxygen and Carbon Photo Credit: Duomo Photography, Inc. Copyright Pearson Prentice Hall

6CO2 + 6 H2O C6H12O6 + 6 O2 Carbon and oxygen are recycled. The Carbon and Oxygen Cycles Carbon and oxygen are recycled. Producers, consumers and decomposers all play a role in this cycle. 6CO2 + 6 H2O C6H12O6 + 6 O2 Producers (autotrophs) and Consumers (heterotrophs) are dependent on each other!

The Carbon Cycle Producers take in carbon dioxide and give off oxygen. (opposite of consumers) Consumers eat producers (taking in carbon-food molecules) and release them as carbon dioxide and carbon waste products. Decomposers (worms, bacteria, etc) break down the remains of producers and consumers and return it to the soil. They also release carbon dioxide.

The Oxygen Cycle Producers take in carbon dioxide and give off oxygen. (consumers are opposite) Most organisms take in oxygen and give off carbon dioxide.

Copyright Pearson Prentice Hall Comparing Photosynthesis and Cellular Respiration Comparing Photosynthesis and Cellular Respiration The energy flows in photosynthesis and cellular respiration take place in opposite directions. Copyright Pearson Prentice Hall

On a global level, photosynthesis and cellular respiration are also opposites. Photosynthesis removes carbon dioxide from the atmosphere and cellular respiration puts it back. Photosynthesis releases oxygen into the atmosphere and cellular respiration uses that oxygen to release energy from food.

The Human Impact Humans affect the amount of carbon dioxide in the atmosphere: Burning oil and other fossil fuels Clearing forests for lumber Burning down trees to clear a forest Factories give off carbon dioxide

Carbon (purple) and Oxygen (orange) Cycle

Copyright Pearson Prentice Hall A feedback loop is a biological occurrence wherein the output of a system amplifies the system (positive feedback) or inhibits the system (negative feedback). Feedback loops are important because they allow living organisms to maintain homeostasis. Copyright Pearson Prentice Hall

Output Tasks: 1. Draw out your own version of the carbon cycle. 2. What would be the effect of the following on the amount of oxygen in the atmosphere? an increase in the number of plants. an increase in the burning of fossil fuels. an increase in the number of animals. 3. How many ways can you think of increasing the amount of carbon dioxide in the atmosphere? List them.

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