Lesson 2 of 4 · Form 3 Biology
Ecology and population estimation
18 min
Key terms
- Habitat: where an organism lives. Niche: its role.
- Population: one species in an area. Community: all populations in an area.
- Ecosystem: community + non-living environment.
Feeding relationships
- Producers (green plants) → primary consumers (herbivores) → secondary consumers (carnivores) → tertiary consumers.
- Decomposers (bacteria, fungi) recycle nutrients.
- Only about 10% of energy passes to the next level; the rest is lost as heat.
Estimating populations
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