Lesson Quiz

Gerald is studying the plants and animals of a meadow. He classifies the grasses and clover as _______ because they make their own food through the process of _______. He classifies insects that feed on the clover as _______ because he thinks they eat only plant matter, not animal matter.

• heterotrophs

• consumers

• chemosynthesis

• decomposers

• autotrophs

Which statement describes ALL primary producers?

• All make energy-rich compounds that can be used by other organisms.

• All make their own food using the energy of compounds in the environment.

• All take in energy-rich compounds that were made by other organisms.

• All make their own food using the energy of sunlight.

Autotrophs can be classified into two groups according to which of these

properties?

• energy source, either sunlight or chemicals

• food type, either plant matter or animal matter

• food quality, either living matter or dead matter

• water quality, either fresh water or salt water

Denirah is asked to research an organism that performs denitrification. Which

strategy is the most likely to be successful?

• Look for phytoplankton that perform photosynthesis.

• Look for ocean-dwelling organisms that perform chemosynthesis.

• Look for soil bacteria that convert atmospheric nitrogen to nitrates.

• Look for soil bacteria that convert nitrates to nitrogen gas.

Water transfer from the ___________ to the _________ when it evaporates from the ocean?

Atmospheric carbon dioxide levels have been increasing from year to year. However, in

locations in the northern hemisphere, carbon dioxide levels may decrease slightly during

the summer months. Which is the MOST likely explanation for these slight summertime

decreases?

• an increase in the rate of cellular respiration during the summer

• a decrease in the rate of cellular respiration during the summer

• an increase in the rate of photosynthesis during the summer

• an increase in the frequency of thunderstorms and hurricanes during the summer

How does the phosphorus cycle differ from the biogeochemical cycles of other

elements, including the carbon, oxygen, and nitrogen?

• Phosphorus cycles through the biosphere, geosphere, and hydrosphere, but not the

  atmosphere.

• Phosphorus cycles through nonliving systems, but not the biosphere.

• Phosphorus cycles through the geosphere, hydrosphere, and atmosphere, but not the

  biosphere.