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WorksheetsMatter Cycles
Total questions: 28
Worksheet time: 27mins
Name
Class
Date
1.
What term is given by scientists to the living parts of an ecosystem?
a)
Biotic Factors
b)
Abiotic Factors
c)
Community
d)
Population
2.
How does carbon dioxide leave the atmosphere?
a)
Through transpiration
b)
Through photosynthesis
c)
Through factory emission
d)
Sunlight
3.
What is one way that carbon enters the atmosphere?
a)
Sunlight
b)
Factory emissions
c)
Ocean uptake
d)
Rain
4.
When carbon combines with oxygen, what forms?
a)
Nitrogen
b)
Argon
c)
Carbon dioxide
d)
Sodium hydrogen
5.
Because of Earth's cycles, organisms can use what over and over?
a)
energy
b)
matter
c)
plants
d)
food
6.
Where do animals get nitrogen from?
a)
soil
b)
air
c)
water
d)
plants
7.
How do animals obtain carbon?
a)
decomposing
b)
combustion
c)
eating plants
d)
breathing it in
8.
Matter on Earth is limited, so it must be used ____________________________.
a)
only once
b)
over and over again
c)
by only animals
d)
at night only
9.
What is the original source of almost all energy in most ecosystems?
a)
carbohydrates
b)
sunlight
c)
water
d)
carbon
10.
What role do these organisms play in their ecosystem as they break down matter?
a)
producer
b)
primary consumer
c)
secondary consumer
d)
decomposer
11.
What role in an ecosystem is this organism?
a)
producer
b)
primary consumer
c)
secondary consumer
d)
decomposer
12.
A graphic illustration that shows each trophic level and the amount of useable energy contained within.
a)
Food chain
b)
Food web
c)
Energy Pyramid
d)
All of these
13.
What do the Carbon Dioxide and Oxygen gases circulate among?
a)
Animals
b)
Plants
c)
The Atmosphere
d)
All of the above
14.
What is the main human source that emits Carbon Dioxide?
a)
Combustion of fossil fuels (natural gas, coal, and oil)
b)
Cement Production
c)
Deforestation
15.
How is carbon dioxide related to humans?
a)
Humans make it
b)
Humans use it
16.
When bacteria in the soil change free nitrogen into nitrogen containing compounds, it is called
a)
Denitrification
b)
Nitrogen fixation
c)
ammonia
d)
decaying
17.
When organisms decay, the nitrogen in their bodies gets ________
a)
returned to the soil
b)
returned to the ocean
c)
fixed
d)
carbonated
18.
In the energy pyramid here, which organisms have the most energy available?
a)
Producers
b)
Carnivores
c)
Herbivores
d)
Top Predator
19.
In the energy pyramid here, how much of the energy in each level gets lost as heat or used by the organism for survival?
a)
80%
b)
90%
c)
10%
d)
20%
20.
The diagram is intended to show relationships in an ecosystem. What do the arrows represent?
a)
The direction of population migration
b)
Differences in dietary habits
c)
Progressively smaller organisms
d)
The direction of the energy flow
21.
Which of the following is not a decomposer
a)
Vulture
b)
Fungus
c)
Worm
d)
Bacteria
22.
Which of the following illustrates the correct ordering of trophic levels?
a)
decomposers-carnivores-autotrophs-herbivores
b)
herbivores-autotrophs-carnivores-decomposers
c)
autotrophs-herbivores-carnivores-decomposers
d)
carnivores-producers-omnivores
23.
True or False: In an ecosystem, there are more apex predators than prey.
a)
True
b)
False
24.
What do the carbon and nitrogen cycles ensure (allow)?
a)
human activities have no effect
b)
living organisms will not become limited to one nutrient
c)
nutrients will be circulated throughout the biosphere
d)
nutrients will not reach toxic levels
25.
What happens to the rest of the energy that doesn't move up to the next trophic level?
a)
it's released as heat
b)
it becomes nutrients for soil
c)
it becomes food
d)
it becomes less space
26.
Which of the following would be the definition of a detritivore?
a)
Animals that eat insects.
b)
Organisms that feed on rocks, recycling the nutrients back into the ground.
c)
Organisms that eat only pants
d)
Things that feed on dead organisms, recycling the nutrients back into the ground.
27.
Nitrogen is released from living things when they die in the form of...
a)
Nitrogen gas
b)
Nitrous oxide
c)
Ammonia
d)
Nitrites
28.
How many trophic levels?
a)
2
b)
3
c)
4
d)
5
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