What this topic covers
B4: Community level systems has 1 subtopic:
- B4.1 Ecosystems
GCSE OCR Higher Biology
B4: Community level systems – GCSE OCR Higher Biology revision notes
Revise B4: Community level systems for GCSE OCR Higher Biology, including B4.1 Ecosystems. 24 lessons across 1 subtopic.
Ecosystems, decomposition and biomass transfer. 24 lessons in 1 subtopic.
24
Lessons
1
Subtopics
B4: Community level systems lessons by subtopic
24 lessons, grouped by subtopic.
B4.1 Ecosystems
- Understanding Ecosystems and Their Organisation
- Competition and Survival in Communities
- Interdependence and Community Stability
- Physical Abiotic Factors in Ecosystems
- Chemical Abiotic Factors and Specialized Environments
- Analyzing the Impact of Abiotic Changes on Communities
- Living Factors Affecting Communities
- Analyzing Changes in Communities
- Types of Adaptations
- Extremophiles and Extreme Environments
- Working with ecological data
- Producers and feeding relationships
- Studying ecosystems and predator-prey relationships
- Material cycling in ecosystems
- The carbon and water cycles
- Microorganisms in material cycling
- Factors Affecting Decomposition and Rate Calculations
- Practical Applications of Decomposition
- Understanding Trophic Levels in Ecosystems
- The Role of Decomposers in Ecosystems
- Understanding Pyramids of Biomass
- Pyramids of Biomass and Energy Transfer
- Why Biomass is Lost Between Trophic Levels
- Calculating Biomass Transfer Efficiency
More in this course
Go back to the full GCSE OCR Higher Biology topic list, or practise this topic with past-paper questions.
Frequently asked questions
Is this the right B4: Community level systems page for my course?
These notes are for GCSE OCR Higher Biology. If you are on a different exam board or tier, choose your course from the Biology page instead, because the content is not always the same.
What should I do after reading the lessons?
Test yourself without the notes open, then try past-paper questions on the same topic. The questions you get wrong tell you which lesson to go back to.