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Grade 9
Biology
Ecosystems: energy pyramids, matter cycles, succession and biodiversity
Browse
Grade 9
Biology
Ecosystems: energy pyramids, matter cycles, succession and biodiversity
Grade 9 Science

Ecosystems: energy pyramids, matter cycles, succession and biodiversity

The main lesson, then each kind of problem it solves.

Ecosystems: energy pyramids, matter cycles, succession and biodiversity

Main lesson
Pyramid of numbers
Use this for “2 oak trees each carry 3,000 caterpillars, and a warbler eats 250 a season. How many warblers can they feed?”
Pyramid of biomass
Use this for “Phytoplankton hold 6 g/m² and zooplankton 18 g/m². How many grams of zooplankton are there for each gram of phytoplankton?”
Simpson’s diversity index
Use this for “Which pond community is more diverse: 25, 5, 5, 5 or 10, 10, 10, 10?”
Primary succession
Use this for “Put these communities in the order they grow on new volcanic rock.”
The nitrogen cycle
Use this for “How do plants such as beans add nitrogen to the soil?”
The carbon cycle and energy
Use this for “How do photosynthesis and respiration move carbon between the air and living things?”
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