Nitrogen Cycle and Carbon Dioxide Levels Quiz

The nitrogen cycle is an example of a(n) _______ cycle. Its processes include the conversion of atmospheric nitrogen into ammonia, which is called _______. Nitrogen is returned to the atmosphere in the process of _______.

• biogeochemical, nitrogen fixation, denitrification

• water, nitrogen limitation, nutrient return

• energy, photosynthesis, nitrogen fixation

• decomposer, denitrification, nitrogen limitation

What does the graph in the image show?

• The change in atmospheric carbon dioxide levels in parts per million (ppm) from 1997 through 2003.

• The change in global temperature from 1997 through 2003.

• The change in oxygen levels in parts per million (ppm) from 1997 through 2003.

• The change in nitrogen levels in parts per million (ppm) from 1997 through 2003.

During which season do carbon dioxide levels naturally decrease due to photosynthesis activity?

• Late spring

• Winter

• Fall

• Early spring

Which arrow includes the process of transpiration?

• Arrow 1

• Arrow 2

• Arrow 3

• Arrow 4

Which statements accurately relate photosynthesis to the other processes of the carbon cycle shown in the diagram? Select all of the correct statements.

• Photosynthesis is the only biological process that takes up carbon dioxide.

• Photosynthesis has the same effect on the carbon cycle as human activities.

• Photosynthesis has the same effect on the carbon cycle as geological activities.

• Photosynthesis is the only process that transfers carbon from the air to the biosphere.

Which is one way that the movement of matter through an ecosystem is different from the transfer of energy?

• Only the movement of matter involves living things.

• Only the movement of matter flows in one direction only.

• Only the movement of matter occurs in an unending cycle.

• Only the movement of matter involves feeding relationships.

Gregory is studying Lake Mairead. The lake has clear water and supports a healthy community of algae, fishes, and other aquatic organisms. Gregory hypothesizes that phosphorus is a limiting nutrient in the lake. Which experimental result provides the strongest evidence in support of the hypothesis?

• Filtering and removing phosphorus from a sample of lake water causes an increase in the growth of algae in the sample.

• Adding phosphorus-rich fertilizer to a sample of lake water causes no observable effect.

• Adding phosphorus-rich fertilizer to a sample of lake water causes an increase in the growth of algae.

• Measurements show that phosphorus is more concentrated in bottom sediments than in the lake water.

Consumers, or heterotrophs, take in food made by other organisms. Then they break apart the food to release its energy. How do these actions of consumers contribute to the carbon cycle?

• Eating and breaking apart food converts carbon to other elements.

• Eating and breaking apart food converts other elements into carbon.

• Eating food involves taking up carbon dioxide.

• Eating and breaking apart food releases carbon dioxide as a byproduct.

Which two observations are most useful for explaining the trends in the data? Select two answer choices.

• Photosynthesis and cellular respiration have opposite effects on carbon dioxide levels.

• Carbon is stored in solid form in shells, rocks, and sediments.

• The burning of fossil fuels adds carbon dioxide to the atmosphere.

• Activities that produce or take up carbon dioxide vary with the seasons.

Which of the claims about the burning of wood is supported by Joan’s model? Select all the claims that are supported.

• Matter is conserved during the burning of wood.

• Chemical energy is conserved during the burning of wood.

• Burning wood involves a series of chemical reactions that occur in one direction only.

• Burning wood involves oxygen as well as carbon.