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