What is
pollinating their flowers.
distributing their seeds.
providing food.
both (a) and (b).
100
What type of succession occurs after a natural process such as a forest fire or flood?
a. primary succession
b. secondary succession
c. old-field succession
d. climax community
100
Which of the following is an abiotic factor in an ecosystem?
a. plants
b. bacteria
c. fungi
d. water
100
What term is used to describe a linear sequence in which energy is transferred from one organism to the next?
a. food web
b. food chain
c. trophic level
d. energy pyramid
100
Which of the following is one of the largest carbon reservoirs on Earth?
a. limestone
b. fossil fuels
c. Amazon rain forest
d. Atlantic ocean
200
The process of two species changing genetically in response to long-term interactions with each other is
a. artificial selection
b. coevolution
c. selective breeding
d. resistance.
200
When volcanoes erupt in the ocean and form new islands, what follows?
a. primary succession
b. secondary succession
c. old-field succession
d. forest succession
200
Which of the following is an ecosystem?
a. a vacant lot
b. oak forest
c. coral reef
d. all of the above
200
Which organism is likely to be in the bottom trophic level in a food chain?
a. leopard seal
b. algae
c. krill
d. killer whale
200
organisms that can transform unusable nitrogen in the atmosphere into chemical compounds containing nitrogen that can be used by other organisms
What is nitrogen-fixing bacteria?
300
Which of the following animals is successful because it moves quickly, reproduces rapidly, and has a waterproof external skeleton?
a. ant
b. mouse
c. bird
d. squirrel
300
What type of succession occurs after a natural process such as a forest fire or flood?
a. primary succession
b. secondary succession
c. old-field succession
d. climax community
300
A desert ecosystem contains
a. air
b. living things
c. sand
d. all of the above
300
The energy lost between trophic levels
a. can be captured only by parasitic organisms.
b. cools the surrounding environment.
c. is used in the course of normal living.
d. evaporates in the atmosphere.
300
evidence of excessive use of fertilizer
What is algal bloom?
400
Single-celled organisms with cell walls but no nuclei are
a. fungi
b. bacteria
c. protists
d. all of the above
400
Which of the following plants is likely to be a pioneer species?
a. lichen
b. grass
c. shrub
d. oak tree
400
Which of the following best describes a population?
a. members of the same species living in the same place at the same time
b. all the red birds in an area
c. all types of organisms living in the same place
d. all the members of the same species
400
the many feeding relationships possible in an ecosystem
What is a food web?
400
Which of the following is NOT part of the nitrogen cycle?
a. nitrogen gas in space
b. nitrogen gas in atmosphere
c. nitrogen compounds in animal waste
d. nitrogen compounds in the soil
500
Which invertebrates are generally small, allowing them to live on little food and to hide from enemies?
a. insects
b. bacteria
c. protists
d. mice
500
a type of succession that occurs on abandoned farmland
What is old-field succession?
500
Which of the following is an abiotic factor in an ecosystem?
a. plants
b. bacteria
c. fungi
d. water
500
The energy consumed by organisms
a. can be stored in fat and sugar molecules
b. remains constant at all trophic
c. undergoes magnification
d. is not partially lost during digestion