Post on 12-Apr-2017
UNIT 3.ECOSYSTEMS
1. What is an ecosystem?A place and the organisms that live in
this place form an ecosystem.
BIOTOPEIncludes all the non-living things in an
ecosystem (soil, water, stones…)
BIOCOENOSISIncludes all the living
things in an ecosystem (plants,
animals…)
The living things that live in an ecosystem form GROUPS
POPULATIONIt`s a group of animals of the same species
that live together
COMMUNITYIt`s a group of
different species that live in the
same place
2. What are trophic relationships?
It is the relationship between the organisms that eat and the organisms that are eaten.PRODUCER
S:They
produce their own food.Ex. Plants.
PRIMARY CONSUMERS:They eat plants
(herbivores)Ex. caterpillar
DECOMPOSERS:They break down dead organisms.
Ex. Fungi and bacteria
SECONDARY CONSUMERS:
They eat herbivores(carnivores)
Ex. Praying mantis
TERTIARY CONSUMERS:
They eat carnivores(carnivores)
Ex. owl
Food chain
3.How do we classify ecosystems?
TYPES OF ECOSYSTEMS
TERRESTRIAL AQUATIC
Oceans, lakes, rivers, ponds…
Rainforests, forest, dessert, grassland…
4. What`s the biosphere?The place where a population lives is
called HABITAT.
Some ecosystems have several types of habitats. They are called
BIOME.
The biosphere is all the ecosystems and habitats on the Earth.
Individual
Individual
5. Why do ecosystem change?
Ecosystems change. Sometimes the changes are natural, but
sometimes they are caused by human activity.
NATURAL CHANGES CHANGES CAUSED BY HUMANS
-Seasonal changes
- Fires because of hot summers
-Pollution-Overfishing-Forest fires-Deforestation