Year 10 - Science
The role of microorganisms in decomposition
Living organisms and their environments
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores ecosystem organisation, biotic and abiotic factors, material cycling, and the role of decomposers. It covers methods for identifying species and measuring their distribution. Emphasis is on selecting appropriate techniques, accurate measurements, sampling, and fieldwork practices.
Lesson Summary
You will learn to explain the role of microorganisms and detritus feeders in decomposition.
Key Notes
- Microorganisms and detritivores (detritus feeders) are responsible for the decomposition of plant and animal material.
- Decay is needed to keep nutrients cycling around an ecosystem.
- Compost is made out of decomposed plant and animal material.
- Biogas is produced when waste material is anaerobically digested.
- Biogas contains methane which can be harvested and used as a fuel.
Vocabulary To Learn
- microorganism: A microorganism is an organism that can only be seen using a microscope.
- decomposer: A decomposer is an organism that feeds on the remains of other living organisms (organic matter).
- decay: Decay is the breakdown (or rotting) of organic matter by bacteria, fungi, or other organisms.
- detritus: Detritus is the remains of living organisms.
- enzyme: An enzyme is a protein that acts as a biological catalyst (a substance that speeds up a reaction).
Common Mistakes To Avoid
- Decomposers release energy that is recycled back to plants.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Microorganisms and detritivores (detritus feeders) are responsible for the decomposition of plant and animal material. Decay is needed to keep nutrients cycling around an ecosystem.
2. Define this scientific word and use it in context. 'microorganism'
A microorganism is an organism that can only be seen using a microscope. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Decomposers release energy that is recycled back to plants. Correction: Decomposers break down dead organisms and waste. This returns minerals to the soil which can be used by plants. It is worth stating that some decomposers are eaten by carnivores as part of food chain diagrams that include decomposers.
More Lessons In This Unit
- Competition and adaptations in ecosystems Study Guide
- Components of an ecosystem Study Guide
- Estimating population size and distribution using transects: practical Study Guide
- Estimating population size using quadrats: practical Study Guide
- Factors affecting the rate of decomposition Study Guide
- Material cycles: the carbon cycle Study Guide
- Material cycles: the water cycle Study Guide
- Measuring the size and distribution of populations of organisms Study Guide
- The effect of temperature on the rate of decomposition by an enzyme: data analysis and evaluation Study Guide
- The effect of temperature on the rate of decomposition by an enzyme: practical Study Guide
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