Chapter 11 / 9 short lessons
Organisms and their environment
Follow energy and carbon through ecosystems, explain pollution and assess ways to protect biodiversity.
G3 Pure Biology / K325 / 2027 syllabus
What do you think?
In a food chain, does grass point towards a grasshopper, or does the grasshopper point towards the grass?
Lessons
0 of 9 marked as readReading food chains and food webs
Identify producers, consumers and decomposers and interpret feeding relationships.
About 5 minWhy less energy reaches the next level
Explain one-way energy flow and calculate the efficiency of transfer between trophic levels.
About 5 minPyramids of numbers and biomass
Construct and interpret pyramids while distinguishing counts from mass.
About 5 minFollowing carbon through an ecosystem
Trace carbon transfers and explain the roles of forests and oceans as carbon sinks.
About 5 minCarbon dioxide and global warming
Explain increased atmospheric carbon dioxide and connect mitigation actions to their mechanisms.
About 6 minWhy sewage can remove oxygen from water
Explain the effects of sewage using decomposition, respiration and dissolved oxygen.
About 5 minPlastic waste in marine ecosystems
Explain harm from marine plastic waste and compare prevention and removal actions.
About 4 minBiomagnification along a food chain
Explain biomagnification using persistence, uptake and repeated feeding.
About 5 minConservation and sustainable use
Explain how species conservation and sustainable resource use maintain biodiversity and ecosystem relationships.
About 5 minWhat you will be able to do
- Interpret feeding relationships and energy transfers.
- Distinguish carbon cycling from energy flow.
- Explain environmental impacts and evaluate conservation actions.