243. What is the process by which bacteria convert nitrogen gas in the air to
ammonia?
A) Excretion
B) Nitrogen fixation
C) Decomposition
D) Denitrification
E) Mineralization
244. Biogeochemical cycling ensures that:
A) human activity will
have no effect on elements
B) many nutrients will not reach toxic concentrations in the biosphere
C) nutrients will be circulated throughout the biosphere
D) human activity will have no effect on energy flow
E) energy flow in one direction
245. What does habitat function of ecosystem relate?
A) the distribution of various species and ecosystems geographically
B) contribute to the maintenance of human health by providing opportunities
C) create an even larger variety of living biomass starting from photosynthesis
D) provide refuge and a reproduction habitat to wild plants and animals
E) regulate essential ecological processes and life support systems through bio-
geochemical
cycles
246. Which of the following is the types of productivity?
A) Primary, secondary and net productivity
B)
Secondary, tertiary and quaternary productivity
C) Primary, secondary and quaternary productivity
D) Secondary, quaternary and net productivity
E) Primary, secondary and tertiary productivity
247. Some living things depend on each other in a very close relationship, which
lasts over time. This relationship is called:
A) Mutualism
B)
Parasitism
C) Symbiosis
D) Predation
E) Commensalism
248. Where does the carbon cycle begin?
A)
The lithosphere
B) The atmosphere
C) The ocean surfaces
D) The hydrosphere
E) Cycles do not have a beginning
249. Once bacteria have fixed nitrogen, it can be taken up by plants and animals,
where it is used in the production of
A) Body fat
B)
Nitrogen oxides
C) Carbohydrates
D) Energy
E) Proteins
250. Phytoplankton act as a carbon store when they:
A) Die and become a food source for
other creatures
B) Die and move down into the deepest part of the ocean
C) Enrich the ocean oxygen by photosynthesis
D) Breathe in CO
2
E) Decay of dead organisms
