images-CMC

Section 4: Cycles in the Environment

Cycles in the Environment

1.

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/8881234567/179000/26_4.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (13.0K)</a>

The two routes for nitrogen fixation in nature are __________.
A)bacteria and the water cycle
B)bacteria and lightning
C)lightning and ultraviolet radiation
D)lightning and ozone formation
2.
What chemicals are used by plants to make carbohydrates during photosynthesis?
A)carbon dioxide and water
B)carbon dioxide and calcium carbonate
C)water and calcium carbonate
D)carbon dioxide and nitrogen
3.
What is the natural warming of Earth’s surface that occurs when certain gases in the atmosphere absorb heat?
A)vulcanism
B)carbon cycle
C)greenhouse effect
D)photosynthesis
4.
When an increase in greenhouse gases leads to an increase in the temperature over all of Earth, a specific condition occurs. What is the common name for this condition?
A)global warming
B)ozone hole
C)photosynthesis
D)carbon cycle
5.
Although nitrogen gas cannot be used by plants, it can be converted into forms that plants can use. What process converts nitrogen gas into this more useful form?
A)global warming
B)nitrogen fixation
C)photosynthesis
D)precipitation
6.
Nitrogen is oxidized in the atmosphere and in the soil by nitrogen-fixing bacteria. What is the most oxidized form of nitrogen?
A)nitrogen monoxide
B)nitrogen dioxide
C)nitrate
D)ammonia
Glencoe Online Learning CenterScience HomeProduct InfoSite MapContact Us

The McGraw-Hill CompaniesGlencoe

Please read our Terms of Use and Privacy Policy before you explore our Web site. To report a technical problem with this Web site, please contact the Web Producer.