Relationships between living things
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L. Living things and food
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Living things obtain food in different ways:
The food chain
Tertiary consumer
* Producers, such as plants and algae, make their food.
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Primary consumers, such as zebras and fish,
eat plants and algae.
* Secondary consumers, such as lions and snakes,
eat primary consumers.
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Tertiary consumers, such as eagles and owls,
are secondary consumers which eat other
secondary consumers.
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Decomposers, such as fungi and bacteria,
eat the remains of other living things.
Secondary consumer
2. Food chains
Food chains show how food transfers from one living thing
to another in an ecosystem. Look at the diagram.
3. Parasitism, mutualism and competition
Primary consumer
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Parasitisffi: ? p?ráSite is a living thing which lives
in or on another living thing, its host. lt harms the host.
',¡ Mutualism; a living thing eats the parasites which live in
or on another living thing. lt benefits both living things.
* Competition: several species compete for the same thing.
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Lichen grows
on a branch.
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Pui these elements of a food chain
in the correct order:
cat leaf bird
The heron
eats insects.
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ECOSYSTEMS
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Give some examples of
consumers.
caterpillar
primary
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