Natural Cycles Review Part 2 Question Preview (ID: 46705)


Science Natural Cycles. TEACHERS: click here for quick copy question ID numbers.

A swelling on a plant root that contains nitrogen-fixing bacteria is
a) runoff
b) photochemical smog
c) biogeochemical cycle
d) nodule

The brown smog produced when air pollutants react with sunlight is
a) runoff
b) photochemical smog
c) biogeochemical cycle
d) nodule

The cycling of chemical elements through the living and nonliving parts of an ecosystem is
a) runoff
b) photochemical smog
c) biogeochemical cycle
d) nodule

Some ___________ in soil perform denitrification. This releases nitrogen back into the atmosphere.
a) nitrogen
b) bacteria
c) legumes
d) runoff

_____________________ is passed up the food chain by herbivores and carnivores.
a) nitrogen
b) bacteria
c) legumes
d) runoff

Nitrogen is absorbed by plants. Plants use nitrogen to make important plant _______________________.
a) nodules
b) legumes
c) molecules
d) cells

Nitrogen molecules make up _______________________ of the earth's atmosphere.
a) 87 points
b) 87 percent
c) 78 points
d) 78 percent

________________________ release nitrogen back into the soil. They do this by breaking down the material in dead organisms and their waste products.
a) producers
b) legumes
c) decomposers
d) predators

Bacteria in soil and in the roots of ____________________________ perform nitrogen fixation.
a) nodules
b) producers
c) decomposers
d) legumes

What are two ways in which cutting down the trees in a forest affect the ecosystem?
a) It can make the ecosystem lose carbon dioxide. 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 oxygen. Too much nitrogen can build up.
d) It can make the ecosystem lose nitrogen. Too much oxygen can build up.

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