1. Trophic relationship

2. 1.Trophic relationship
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 ”.

3. 2. Trophic level
 In a ecosystem ,we can group organisms by the thing
that they feed on .Each group forms a different trophic
level.
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
decomposers.

4. 3.Producers
 Producers :
Producers are like plants and algae : they make their
own food. Producers are eaten by herbivores.

5. 4.Primary consumers
 Primary consumers :
Herbivorous organisms are primary consumers: they
feed on plants and algae. Primary consumers are eaten
of secondary consumers.

6. 5.Secondary consumers
 Primary consumers:
Carnivorous organisms are secondary consumers: they
feed on herbivorous. Secondary consumers are eaten of
tertiary consumers.

7. 6.Tertiary consumers
 Tertiary consumers:
Tertiary consumers feed on secondary consumers.
Tertiary consumer are eaten by decomposers.

8. 7.Decomposers
 Decomposers:
Fungi and bacteria are decomposers: they break down
the remains of dead organisms. Decomposers eat
producers, primary, secondary and tertiary consumers.

9. 8.Trophic or food chain
 A trophic chain and food chain:
A trophic chain or food chain represents the
interrelationships between organisms on different
trophic levels.

10. 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.

11. 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.

12. Video of food chain:
A video of a food chain

13. Activities
 Activities of trophic levels

14. the
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