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Natural Cycles Review Part 2
Test Description: Science Natural Cycles
Instructions: Answer all questions to get your test result.
1) A swelling on a plant root that contains nitrogen-fixing bacteria is
A
biogeochemical cycle
B
photochemical smog
C
runoff
D
nodule
2) The brown smog produced when air pollutants react with sunlight is
A
nodule
B
biogeochemical cycle
C
photochemical smog
D
runoff
3) The cycling of chemical elements through the living and nonliving parts of an ecosystem is
A
photochemical smog
B
nodule
C
biogeochemical cycle
D
runoff
4) Some ___________ in soil perform denitrification. This releases nitrogen back into the atmosphere.
A
legumes
B
nitrogen
C
bacteria
D
runoff
5) _____________________ is passed up the food chain by herbivores and carnivores.
A
nitrogen
B
legumes
C
bacteria
D
runoff
6) Nitrogen is absorbed by plants. Plants use nitrogen to make important plant _______________________.
A
molecules
B
nodules
C
legumes
D
cells
7) Nitrogen molecules make up _______________________ of the earth's atmosphere.
A
78 percent
B
87 percent
C
78 points
D
87 points
8) ________________________ release nitrogen back into the soil. They do this by breaking down the material in dead organisms and their waste products.
A
decomposers
B
producers
C
legumes
D
predators
9) Bacteria in soil and in the roots of ____________________________ perform nitrogen fixation.
A
legumes
B
decomposers
C
producers
D
nodules
10) What are two ways in which cutting down the trees in a forest affect the ecosystem?
A
It can make the ecosystem lose oxygen. Too much nitrogen can build up.
B
It can make the ecosystem lose nitrogen. Too much carbon dioxide can build up.
C
It can make the ecosystem lose carbon dioxide. Too much nitrogen can build up.
D
It can make the ecosystem lose nitrogen. Too much oxygen can build up.
*select an answer for all questions
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