End of Year Post Test Review Flashcards
Where does the energy in most ecosystems come from?
The sun
Why are some organisms more likely to survive than others?
Have certain physical traits
Most scientists classify organisms into?
Five kingdoms
Which f the following describes soil and temperature in an ecosystem?
Abiotic factors
What are single-celled organisms with cell walls but nuclei?
Fungi
Which gas makes up 78 percent of our atmosphere but can be used by plants only when transformed by bacteria first?
Nitrogen
If you visited a savanna, what would you likely see?
Large herds of grazing animals, such as rhinos, gazelles, and giraffes.
What best describes a tropical rain forest?
Species of animals with specialized ways of surviving in order to avoid competition.
What kind of natural disaster helps some forest communities by allowing some trees to release their seeds, by clearing away deadwood, and by encouraging new growth?
Fire
Consumers are organisms that do what?
They occupy an ecosystems lowest energy level.
Why do plants play a crucial role in the carbon cycle?
Allow carbon to enter an ecosystem through photosynthesis.
What term is used to refer to the many feeding relationships that are possible in an ecosystem?
Food web
The distance north or south of the equator, as measured in degrees, is called?
Latitude
Define density of a population
The number of individuals per unit area.
What is an endangered species?
A species in danger of extinction
