1.
Organisms that eat plants in a food chain are called _____. (1 point)
primary consumers
producers
secondary consumers
decomposers
2.
All energy flowing through living systems on Earth can be traced back to the _____. (1 point)
plant population
sun
oceans
animal populations
3.
Floods, droughts, or cold spells affect the _____ of an ecosystem. (1 point)
abiotic factors
balance
materials
niche
4.
Ecologists count the number of frogs living in a pond community to determine the _____. (1 point)
balance
limiting factors
organisms
population density
5.
The tree a squirrel lives in is its _____. (1 point)
community
ecosystem
habitat
niche
6.
A part of the biosphere that contains a living and nonliving part is called a(n) _____. (1 point)
abiotic factor
ecosystem
habitat
organism
Use the figure below to answer questions 7–8.
coral reef ecosystem
7.
On the coral reef ecosystem figure shown, which factor is biotic? (1 point)
rocks
sand
sea horse
water
8.
On the coral reef ecosystem figure shown, which factor is abiotic? (1 point)
algae
sharks
rock
sea horses
9.
An organism’s specific role in an ecosystem is called its _____. (1 point)
function
niche
job
position
10.
A factor that prevents a populations from increasingly indefinitely is called a(n) _____. (1 point)
biotic factor
limiting factor
abiotic factor
preventative factor