BIO 103 Exam 3
All life forms must convert carbon into organic matter. What is the primary source of
carbon for all life forms?
A) nutrients in soil
B) plants
C) Bacteria
D) CO2 – answer D) CO2
group of individuals of the same species living within a region and interacting closely
with each other - answer population
several populations of different species living within a region and interacting closely with
each other - answer community
communities interacting with their abiotic environment - answer ecosystem
autotrophs in a community - answer producers
organisms that feed on dead and decaying matter - answer decomposers
heterotrophs that eat secondary consumers - answertertiary consumers
heterotrophs that feed on producers - answerprimary consumers
heterotrophs that eat primary consumers - answersecondary consumers
example organism: herbivores - answerprimary consumers
example organism: predators / carnivores that eat smaller predators - answertertiary
consumers
example organism: earthworms, carrion flies, crayfish - answerdecomposers and
detritivores
example organism: predators / carnivores that eat herbivores - answersecondary
consumers
Which of the following represent producers?
[check all the boxes that apply]
- photosynthetic organisms: plants, cyanobacteria, green algae
,- herbivores
- chemosynthetic bacteria and archaea
- predators / carnivores that eat small predators
- earthworms, carrion flies, crayfish
- predators / carnivores that eat herbivores - answer- photosynthetic organisms: plants,
cyanobacteria, green algae
- chemosynthetic bacteria and archaea
Which of the following could NOT be a primary producer in an ecosystem?
- a fungus
- a photosynthetic protist
- a plant
- cyanobacteria - answer- a fungus
All producers ________________________.
- are autotrophs
- have chloroplasts
- are autotrophs, perform photosynthesis, and have chloroplasts
- perform photosynthesis
- are autotrophs and perform photosynthesis - answer- are autotrophs
true or false?
Detritivores and decomposers use nutrients from the soil and convert it to organic
carbon. - answerfalse
A human vegetarian uses less resources than a meat eater. Why might this statement
be true?
- vegetarians are primary consumers, whereas meat eaters are secondary / tertiary
consumers in the food chain
- vegetarians are more environmentally conscious than meat eaters
- vegetarians have smaller appetites than meat eaters
- vegetarians weigh less than meat eaters - answer- vegetarians are primary
consumers, whereas meat eaters are secondary / tertiary consumers in the food chain
A grassland ecosystem consists of primary producers, primary consumers, secondary
consumers, tertiary consumers and decomposers. Which of the following is likely to be
true if all the secondary consumers in this ecosystem die?
- decrease in the biomass of producers
- decrease in the biomass of primary consumers
- increase in the biomass of decomposers
- impossible to predict - answer- decrease in the biomass of producers
, Which of the following is an autotroph?
- producer
- primary consumer
- secondary consumer
- decomposer
- tertiary consumer - answer- producer
In a food chain, the arrows point in the direction of _______.
- energy flow
- the organism being eaten
- the dead organism - answer- energy flow
In an energy pyramid, each higher trophic level contains ______ energy than the lower
trophic level.
- less
- more - answer- less
Which of the following is more sustainable?
- food web
- food chain - answer- food web
Which has more biodiversity?
- food web
- food chain - answer- food web
Decomposers are organisms that __________.
- feed on dead organic matter
- perform only anaerobic respiration
- can be autotrophs or heterotrophs
- are an unimportant part of the food web - answerfeed on dead organic matter
Herbs smell and taste "nice" because
A) they have chemicals in their leaves that are toxic to herbivores
B) humans like aromatic herbs for cooking
C) they take up chemicals from the soil
D) there is no reason; they just smell like that - answerA) they have chemicals in their
leaves that are toxic to herbivores
All life forms must convert carbon into organic matter. What is the primary source of
carbon for all life forms?
A) nutrients in soil
B) plants
C) Bacteria
D) CO2 – answer D) CO2
group of individuals of the same species living within a region and interacting closely
with each other - answer population
several populations of different species living within a region and interacting closely with
each other - answer community
communities interacting with their abiotic environment - answer ecosystem
autotrophs in a community - answer producers
organisms that feed on dead and decaying matter - answer decomposers
heterotrophs that eat secondary consumers - answertertiary consumers
heterotrophs that feed on producers - answerprimary consumers
heterotrophs that eat primary consumers - answersecondary consumers
example organism: herbivores - answerprimary consumers
example organism: predators / carnivores that eat smaller predators - answertertiary
consumers
example organism: earthworms, carrion flies, crayfish - answerdecomposers and
detritivores
example organism: predators / carnivores that eat herbivores - answersecondary
consumers
Which of the following represent producers?
[check all the boxes that apply]
- photosynthetic organisms: plants, cyanobacteria, green algae
,- herbivores
- chemosynthetic bacteria and archaea
- predators / carnivores that eat small predators
- earthworms, carrion flies, crayfish
- predators / carnivores that eat herbivores - answer- photosynthetic organisms: plants,
cyanobacteria, green algae
- chemosynthetic bacteria and archaea
Which of the following could NOT be a primary producer in an ecosystem?
- a fungus
- a photosynthetic protist
- a plant
- cyanobacteria - answer- a fungus
All producers ________________________.
- are autotrophs
- have chloroplasts
- are autotrophs, perform photosynthesis, and have chloroplasts
- perform photosynthesis
- are autotrophs and perform photosynthesis - answer- are autotrophs
true or false?
Detritivores and decomposers use nutrients from the soil and convert it to organic
carbon. - answerfalse
A human vegetarian uses less resources than a meat eater. Why might this statement
be true?
- vegetarians are primary consumers, whereas meat eaters are secondary / tertiary
consumers in the food chain
- vegetarians are more environmentally conscious than meat eaters
- vegetarians have smaller appetites than meat eaters
- vegetarians weigh less than meat eaters - answer- vegetarians are primary
consumers, whereas meat eaters are secondary / tertiary consumers in the food chain
A grassland ecosystem consists of primary producers, primary consumers, secondary
consumers, tertiary consumers and decomposers. Which of the following is likely to be
true if all the secondary consumers in this ecosystem die?
- decrease in the biomass of producers
- decrease in the biomass of primary consumers
- increase in the biomass of decomposers
- impossible to predict - answer- decrease in the biomass of producers
, Which of the following is an autotroph?
- producer
- primary consumer
- secondary consumer
- decomposer
- tertiary consumer - answer- producer
In a food chain, the arrows point in the direction of _______.
- energy flow
- the organism being eaten
- the dead organism - answer- energy flow
In an energy pyramid, each higher trophic level contains ______ energy than the lower
trophic level.
- less
- more - answer- less
Which of the following is more sustainable?
- food web
- food chain - answer- food web
Which has more biodiversity?
- food web
- food chain - answer- food web
Decomposers are organisms that __________.
- feed on dead organic matter
- perform only anaerobic respiration
- can be autotrophs or heterotrophs
- are an unimportant part of the food web - answerfeed on dead organic matter
Herbs smell and taste "nice" because
A) they have chemicals in their leaves that are toxic to herbivores
B) humans like aromatic herbs for cooking
C) they take up chemicals from the soil
D) there is no reason; they just smell like that - answerA) they have chemicals in their
leaves that are toxic to herbivores
