Ecology test

define pyramid of energy and numbers
shows a decrease in energy and biomass through the food chain. Shows the decrease in the number of animals in a food chain.

What does a food web represent?
many possible exchange of energy in an ecosystem.

what does a food chain represent?
The possible exchange of energy through an ecosytem.

what are the four trophic levels?
producers (autotrophs), first order consumers (herbivore), Second order consumers (carnivore/omnivore), decomposer (detrivore)

define autotroph
An organism that uses energy to produce its own food supply from inorganic compoumds.

define population
all of the members of a particular species that live in one area.

definition of ecology
the branch of biology dealing with interactions among organisms and their environment.

How do scientists use modeling to study ecological changes?
ecologists make models to gain insight into complex phenomena such as the effects of global warming on ecosystems.

Define predator and prey interaction. Give an example.
Predator kills another organism (prey) for food. A lion eats a zebra, a snake eats mice.

Define symbiosis.
two or more different species living in close association.

What is mutualism? give an ex.
Both organisms benefit. algae and fungus: algae provides food, fungus provides moisture.

what is commensalism? give an ex.
One benefits, the other is unaffected, clownfish and sea anemone.

what is Parasitism? give an ex.
One benefits, the other is harmed. Tic and a dog.

define competition. give examples
when two species use the same resource. food lighr minerals, water

Define a nitche
the particular role or job of an organism in the community.

what does a nitche determine?
how the organism affects energy flow within an ecosystem.

name, define, and give examples of a symbionic relationship
mutualism: Both organisms benefit. algae and fungus: algae provides food, fungus provides moisture. Commensalism: One benefits, the other is unaffected, clownfish and sea anemone. Parasitism: One benefits, the other is harmed. Tic and a dog.

explain parts of a food web.
who are the producers? who are the consumers? who are the decomposers?