Trophic relationship are important
connections between the organisms within an
ecosystem. They are the feeding relationships
between organisms that “ eat ” and organisms
that “ are eaten ”.
2. Trophic level
In a ecosystem ,we can group organisms by the thing
that they feed on .Each group forms a different trophic
Trophic level : The trophic level of an organism is the
position it occupies in a food chain. trophic level has five
groups: the producers ,the primary consumers ,the
secondary consumers ,the tertiary consumers and the
Producers are like plants and algae : they make their
own food. Producers are eaten by herbivores.
Primary consumers :
Herbivorous organisms are primary consumers: they
feed on plants and algae. Primary consumers are eaten
of secondary consumers.
Carnivorous organisms are secondary consumers: they
feed on herbivorous. Secondary consumers are eaten of
Tertiary consumers feed on secondary consumers.
Tertiary consumer are eaten by decomposers.
Fungi and bacteria are decomposers: they break down
the remains of dead organisms. Decomposers eat
producers, primary, secondary and tertiary consumers.
8.Trophic or food chain
A trophic chain and food chain:
A trophic chain or food chain represents the
interrelationships between organisms on different
9.An example of food chain
An example of food chain:
In nature, ecosystem include more than one food
chain. For example, in a country field, there can be
plants that provide food for insects, but snails and mice
eat the plants too. Frogs eat the insects, along with
spiders , worms and slungs.
10.Trophic or food web
A trophic web or food web:
A trophic web or food web represents all the different
food chains within an ecosystem.