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Recycling nutrients

Recycling nutrients. Starter: State 5 ways that carbon dioxide is released into the atmosphere. State 2 ways in which carbon dioxide is removed from the atmosphere. Why is the excessive production of carbon dioxide a threat to an ecosystem?. Today’s objectives: describe the carbon cycle

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Recycling nutrients

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  1. Recycling nutrients Starter: State 5 ways that carbon dioxide is released into the atmosphere. State 2 ways in which carbon dioxide is removed from the atmosphere. Why is the excessive production of carbon dioxide a threat to an ecosystem? Today’s objectives: describe the carbon cycle describe the nitrogen cycle

  2. Carbon cycle in action • http://www.bbc.co.uk/learningzone/clips/global-warming-carbon-dioxide-and-acidification-of-the-oceans/7050.html • Carbon Cycle • Fill in the gaps on the sheet. • Colour in the producers (sources) of carbon one colour and colour the removers (sinks) of carbon another.

  3. Nitrogen cycle in action • http://www.bbc.co.uk/learningzone/clips/recycling-nutrients/4172.html • Nitrogen cycle • Fill in the table to complete the nitrogen cycle.

  4. The Nitrogen cycle

  5. The Nitrogen cycle

  6. What is the role of bacteria in the Nitrogen cycle? Answer the final activity from the worksheet.

  7. Answers • Activity 3 (High demand) • Q1 Lightning; nitrogen-fixing bacteria in the roots of beans and peas; nitrogen-fixing bacteria in the soil; decomposition by bacteria and fungi. • Q2 By the decay of nitrogen-containing plants and animals and their urine and faeces; and by denitrifying bacteria. • Q3 Fertilisers contain nitrates; plants need nitrates to create proteins, which help them grow; fertilisers are added to help plants grow.

  8. Plenary – key words Can you define all these words? • carbon • carbon cycle • carbon dioxide • combustion • respiration • decomposition • nitrogen cycle • nitrates • proteins • photosynthesis

  9. Brine shrimp ecosystem To do: • Put some sand in a bottle. • Put some gravel on top of the sand. • Fill the bottle 2/3 full with salt water (brine). • Put a few drops of plant food in the water. • Put some brine shrimp eggs into the bottle. • Test the water for nitrates. • Leave for a few weeks.

  10. Brine shrimp ecosystem What would you expect to happen to your ecosystem over time? What would you expect to happen to the nitrate level in your ecosystem over time? Why?

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