Question 3

Question

Which statement below best summarizes the likely effects on the carbon cycle of clear-cutting, or removing all the trees, in vast areas of a forest?



a
Clear-cutting would increase the amount of carbon dioxide found in the atmosphere.
b
Clear-cutting would reduce the amount of carbon dioxide found in the atmosphere.
c
Clear-cutting would limit the amount of nitrogen-fixing bacteria in the area.
d
Clear-cutting would allow for secondary succession of smaller plants and more carbon.
Question 4
The diagram below shows the carbon cycle.

Which of the following processes is the BEST description of humans burning fossil fuels?



a
decomposition
b
combustion
c
respiration
d
photosynthesis
Question 5
How are the movements of energy and chemicals (matter) through living things in ecosystems different?

a
Energy flows in one direction and chemicals cycle.
b
Energy is limited in the biosphere, and chemicals are always available.
c
Energy forms chemical compounds, and chemicals are lost as heat.
d
Chemicals flow in one direction, and energy cycles.
Question 6
Directions: The diagram below models part of the nitrogen cycle. Use the diagram to answer any questions that follow.

What happens to the nitrogen at W?

a
Its usable form is bonded with other molecules in the atmosphere.
b
Its usable form is inhaled and turned into proteins by the rabbit.
c
Its unusable form is converted into a form that is usable by bacteria in the soil.
d
Its unusable form is directly transferred up the tree roots.
Question 7
Within the ecosystem there are producers, consumers, and decomposers. Which are found at the bottom of the energy pyramid?

a
producers
b
consumers
c
decomposers and producers
d
decomposers and consumers

Answer 1

a
producers