Science!10: Biology! Carbon, Nitrogen and Phosphorus...
Transcript of Science!10: Biology! Carbon, Nitrogen and Phosphorus...
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Science 10: Nutrient Cycles 1
Science 10: Biology! Carbon, Nitrogen and Phosphorus Cycles
Nutrients: chemicals that are required for plant or animal growth and other life processes: carbon, hydrogen, oxygen, nitrogen and phosphorus. Stores: . These can be found in the Earth’s atmosphere, oceans and land masses. Nutrient cycle: the flow of nutrients through biotic and abiotic processes. Carbon cycle 1. Choose 4 different colours 2. Make a legend and colour the arrows, boxes or circles according to the legend.
¨ Colour #1 – carbon stores ¨ Colour #2 – carbon exchanges ¨ Colour #3 – How carbon gets into the atmosphere ¨ Colour #4 – How carbon get out of the atmosphere
Answer the following questions:
1. How many kilograms are in a gigatonne?
2. In what form is carbon released into the atmosphere?
3. What is photosynthesis? Where does it occur? (a) Write the equation for photosynthesis:
(b) Does photosynthesis use or release carbon?
4. What is cellular respiration Where does it occur? (a) Write the equation for cellular respiration:
(b) Does cellular respiration use or release carbon?
5. What is decomposition – where does the carbon go during decomposition? 6. Define carbon sink/store: (a) where would carbon be stored in the short term? (there should be four) (b) where would carbon be stored in the long term? (there should be five) 7. List the sources that release carbon into the atmosphere (there should be five). 8. What is the main cause of increased carbon in the atmosphere?
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Science 10: Nutrient Cycles 2
Nitrogen cycle 1. Choose 4 different colours 2. Make a legend and colour the arrows, boxes or circles according to the legend.
¨ Colour #1 – How nitrogen gets into the soil ¨ Colour #2 – How nitrogen gets into the plants ¨ Colour #3 – How nitrogen gets into the water ¨ Colour #4 – How nitrogen gets into the air
Answer the following questions: 1. List the 8 chemicals that contain nitrogen (include their name and formula): 2. Explain the process of nitrogen fixation. (a) What are the two biological methods of nitrogen fixation? What do nitrogen fixing bacteria do? (b) What is the non-‐biological method of nitrogen-‐fixation? 3. Explain the process of nitrification. What two reactions do nitrifying bacteria help with? 4. Explain the process of denitrification. 5. List four ways in which nitrogen gets into the atmosphere. 6. List four ways in which nitrogen gets into the soil. 7. List three ways in which nitrogen gets into water. 8. List two sources of nitrogen for plants. 9. How does nitrogen get into animals? 10. Look up the term eutrophication. What is it? What happens?
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Science 10: Nutrient Cycles 3
Phosphorus cycle 1. Choose 6 different colours 2. Make a legend and colour the arrows, boxes or circles according to the legend.
¨ Colour #1 – Phosphorus flows ¨ Colour #2 – Phosphorus stores ¨ Colour #3 – Long cycle -‐ How phosphorus moves from ocean sediments to soil ¨ Colour #4 – Short cycle – How phosphorus moves through a land ecosystem ¨ Colour #5 – Short cycle – How phosphorus moves through an aquatic ecosystem ¨ Colour #6 – Short cycles – How phosphorus moves between the land and water ecosystems
Answer the following questions: 1. List the five phosphorus sinks/stores. (a) Which one is the greatest? (b) Where is phosphorus NOT stored? 2. In what form is phosphorus stored? 3. List the eight main sources of phosphorus. Which one is the greatest? 4. Describe the three short cycles on the diagram – one on land, one in the water and one in water/land and air. What is the source of the phosphorus in each case? Land: Water: Water/land and air: 5. The long cycle ties into the three short cycles. How is the long cycle different from the short cycles? 6. What is the main way in which humans add phosphorus to ecosystems?
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Science 10: Nutrient Cycles 4
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Science 10: Nutrient Cycles 5
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Science 10: Nutrient Cycles 6
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Science 10: Nutrient Cycles 7