quiz one Flashcards
What is an ecosystem?
A system made up of all living and nonliving things in one environment
What are biotic factors?
Living things like plants, animals and microbes
What are Abiotic factors?
Nonliving things like sunlight, air, water and rocks
Define population
A group of the same type of animal or plant
Examples of ecosystems
Lakes, oceans, ponds ECT.
How is energy transferred in an ecosystem?
Between species as they eat each other for food.
What do food chains show?
The movement of energy through arrows
What is a Trophic level
A section in an ecosystem where organisms with the same source of energy are grouped
define producer
An organism that can make its own food and becomes food for organisms that can’t
Define primary consumer
Organisms that eat the producers
Define secondary consumer
Organisms that eat the primary consumers and sometimes producers
Define tertiary consumer
organisms that eat the secondary level and sometimes primary.
Heterotroph
organisms that cannot make their own food and haven to consume others for energy.
Autotroph
organisms that can create their own food
What percentage of energy gets transferred from one trophic level to the next?
10%
List the number sequence if the producers start with 10,000 kcal of energy
1,000, 100, 10
which trophic level has the highest amount of available energy?
Producers
What is a decomposer
An organism that breaks down other dead organisms for food and uses them to put nutrients into the soil
In a food web, arrows show…
the direction of energy flow
What is a keystone species?
The most important species in an ecosystem. Organisms depend on these species to survive and they have the biggest impact if removed.
What do carnivores eat?
Primary consumers
What type of affect do secondary consumers have on producers, and vice versa?
Indirect
What is a trophic cascade?
When one level is affected, all levels below are affected
A, an-
without, not
