Ecology Review

Front

Which of the following descriptions about the organization of an ecosystem is correct?

• Species make up communities, which make up populations
• Species are grouped in populations, which make up communities
• Communities make up species, which make up populations
• Populations make up species, which make up communities

Back

Species are grouped in populations, which make up communities

Front

Carbon cycles through the biosphere in all of the following processes EXCEPT: respiration, decomposition, photosynthesis.

Back

precipitation

Front

An organism's niche is

Back

the range of physical and biological conditions in which an organism lives and the way in which it uses those conditions

Front

No two species can occupy the same niche in the same habitat at the same time

Back

because there are not enough resources for both species to share therefore the two species compete

Front

What is biodiversity?

Back

the variability among organisms

Front

The Greenhouse Effect is best described as...

Back

A process that traps solar radiation in the atmosphere

Front

"Bottom up regulation" is another term for trophic cascade.

Back

False

Answer explanation

"Bottom up"-- producers control ecosystem

Trophic cascades are "top-down"; predators control ecosystem

Front

Nitrifying bacteria do what?

Back

Turn NH4+ and NH3+ into nitrate or nitrite (NO3- or NO2-)

Front

Nitrogen fixing bacteria do what?

Back

Turn N2 gas into NH4+ or NH3+

Front

Which is true about the phosphorous cycle?

Back

Phosphorous never enters the atmosphere