1. Chapter 5, Lesson 1
Interactions in an Ecosystem
ecosystem
abiotic factor
biotic factor
population
community
ecology
habitat
niche
producer
decomposer
consumer
topsoil
humus

2. ecosystem – all the living and
non-living things in an area
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3. abiotic factor – the non-living
parts of an ecosystem
water minerals
light
air temperature
soil

4. biotic factor – the living parts of
an ecosystem
animals
plants
protists bacteria
fungi

5. population – all the organisms of
the same species living in an area

6. community – all the populations
living in an area

7. ecology – the study of how all
things in an ecosystem interact
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8. habitat – the place where an
organism lives
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links!

9. niche – the role of an organism in
its community
What does the species eat?
What eats the species?
What environment does the species need?
Is the species active by night or by day?
NO TWO SPECIES CAN FILL THE SAME NICHE!

10. producer – an organism that produces
oxygen and food like plants and algae

11. consumer – animals are consumers.
They eat algae, plants, or other animals.

12. decomposer – organisms, such as bacteria, fungi,
and worms that break down dead plants and
animals into useful things like minerals that enrich
the soil.

13. topsoil – the top layer of soil

14. humus – partly decayed plant matter