3/11 Nitrogen and carbon cycles

Multiple Choice

Which type of human impact is shown in the picture below?

• Desertification

• Deforestation

• Urban sprawl

• Land pollution

Multiple Choice

Which of the following would be the most likely effect, if there were a sudden increase in the cricket population?

• There would be a decrease in the small bird population.
• There would be a decrease in the grass/flowers population.
• There would be a decrease in the mice population.
• There would be an increase in the grass/flowers population.

Multiple Choice

In the energy pyramid here, how much of the energy in each level gets lost as heat or used by the organism for survival?

• 80%
• 90%
• 10%
• 20%

Multiple Choice

Examples of how humans negatively affect local ecosystems are

• Building dams, deforestation (cutting down trees), adding point sources to nearby streams to allow for run-off, building roads and structures, and salting roads.
• Creating laws to prohibit fishing from local streams.
• Planting trees and other plants to attract native species.
• Removing non-native species from the environment.

Multiple Choice

How would the biodiversity of this ecosystem be affected if the lantern fish disappeared?

• The ocean sunfish population would increase.
• The large shark population would die out.
• The squid would die out.
• There would be no change.

Multiple Choice

In which organism would biomagnification be the most concentrated? (Remember the lab: Rabbits eat the grass, the snake eats the rabbit, the hawk eats the snake--the hawk is the apex predator)

• grass

• rabbit

• snake

• hawk

Multiple Choice

Which organism do the owl and the weasel compete for in the food web?

• Hawk
• Spider
• Grasshopper
• Shrew

Multiple Choice

How animals get the nitrogen they need

• from the air they breathe
• from the water they drink
• from the food they eat
• from the Sun

Multiple Choice

What process is represented by D?

• nitrification

• assimilation

• decomposition

• denitrification

Multiple Select

How is Nitrogen fixed naturally?

• plants

• Lighting

• Greenhouse gases

• bacteria

• Fungs

Multiple Choice

What converts some atmospheric nitrogen into nitrates that organisms can use?

• Sun
• Rain
• Thunder
• Lighting

Multiple Choice

Which of the following add carbon dioxide to the atmosphere?

• volcanoes
• combustion of fossil fuels
• animal and plant respiration
• all of these

Multiple Choice

A correct path that nitrogen could take would be

• air -> animals -> plants -> bacteria

• animals -> air -> bacteria -> plants

• bacteria -> air -> plants -> animals

• air -> bacteria -> plants -> animals

Multiple Choice

A carbon "sink" is best described as:

• a reservoir that readily releases carbon to another reservoir
• a carbon reservoir that stores more carbon that it is releasing
• something that causes carbon to leak out to the atmosphere
• a carbon reservoir that is releasing more carbon than it is taking in

Labelling

Label the following Carbon cycle.

Drag labels to their correct position on the image

fossil fuels

animals breathing (respiration)

photosynthesis

sunlight

Multiple Choice

Where does the SKY get its carbon from?

• The sun

• Animals breathing

• Water

• The sun