Natural Sciences Exam — Biomes, Adaptations and Biodiversity
Master ecology concepts: what an ecosystem is, how a food chain works (producers, consumers and decomposers), the main biomes of the planet (tropical rainforest, tundra, desert) and species relationships (mutualism, parasitism, commensalism).
Biology & Geology · Primary & Secondary
Producers (plants) → Primary consumers (herbivores) → Secondary consumers (carnivores) → Decomposers (fungi, bacteria). Energy is lost ≈90% at each level.
Tropical rainforest: most biodiversity. Tundra: permafrost, no trees, very cold. Desert: extreme dryness. Taiga: coniferous forest, long cold winters.
Mutualism (+/+): bees and flowers. Commensalism (+/0): clownfish in anemone. Parasitism (+/−): tick on dog. Predation (+/−): wolf hunts deer.
"A Year 7 student identified the rabbit in the chain grass→rabbit→fox→eagle as a "secondary consumer". After the exam, she understood it is a primary consumer (herbivore that eats producers)."
Tricks and techniques to master this topic faster:
Producers are always plants or algae. Herbivores are primary consumers. Carnivores eating herbivores are secondary consumers.
Decomposers (fungi, bacteria) close the matter cycle — without them nutrients would not return to the soil.
The tropical rainforest holds 50-80% of Earth's species despite covering only 6% of the land surface.
If you are studying Ecosystems — Food Chains and Biomes, these curriculum topics complement each other:
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