What's covered
Key facts
Biomes
Climate — mainly temperature and rainfall — is the primary factor that determines which biome develops in a given area.
Food Chains and Webs
A carnivore is an animal that eats other animals.
Biomes
A biome is a large global zone defined by its climate, vegetation and wildlife.
Food Chains and Webs
The arrows in a food chain show the direction in which energy flows — from the organism being eaten to the organism eating it.
Biomes
Hot deserts receive less than 250 mm of rainfall per year.
Food Chains and Webs
A food chain shows the transfer of energy from producers to consumers through successive feeding steps.
Biomes
The tropical rainforest is the dense forest biome found near the equator, with consistently warm temperatures and very high rainfall.
Food Chains and Webs
A consumer is an organism that obtains its energy by feeding on plants or other animals, rather than producing its own food.
Biomes
The tropical rainforest biome receives over 2,000 mm of rainfall per year.
Food Chains and Webs
A decomposer is an organism (such as bacteria or fungi) that breaks down dead organic matter into simpler substances, recycling nutrients back into the ecosystem.
Sample questions
A taste of the 22 questions in this topic, answers marked. Sign up to practise the full set with spaced repetition.
What is a biome?
- ✓a large global zone defined by its climate, vegetation, and wildlife
- •a network of feeding relationships between organisms
- •a small area where a particular species lives
- •the variety of plant and animal species found in one area
What is a producer in a food chain?
- •an organism that breaks down dead organic matter
- •an organism that feeds on plants for energy
- •an organism that hunts other animals for food
- ✓an organism that makes its own food using sunlight
What is the name of the dense forest found near the equator?
- •savanna grassland
- •taiga boreal forest
- •temperate deciduous forest
- ✓tropical rainforest
What is a consumer in a food chain?
- •an organism that breaks down dead organic material
- •an organism that converts sunlight into chemical energy
- ✓an organism that feeds on plants or other animals for energy
- •an organism that makes its own food through photosynthesis
What determines which biome exists in an area?
- ✓Climate — mainly temperature and rainfall — determines which biome develops
- •Distance from the sea determines all biome boundaries globally
- •Human activity now determines which biome exists in any area
- •The underlying rock type determines the vegetation that can grow
What is a decomposer in a food chain?
- ✓an organism that breaks down dead organic matter into simpler forms
- •an organism that feeds on plants for energy
- •an organism that hunts other animals for food
- •an organism that makes food through photosynthesis
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