5th six weeks review

Which of the following removes carbon from the atmosphere?

• Combustion
• Respiration
• Photosynthesis
• Death

Organisms that do not decompose can be buried and become what?

• water
• nutrients
• air
• fossil fuels

If the plant population decreased, the amount of carbon in the atmosphere would _________.

• Stay the same

• Increase

• Decrease

When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.

• Water
• Atmosphere
• Sun
• Air

How does the human body return carbon to the atmosphere in the carbon cycle?

• Waste products

• Photosynthesis

• Cellular respiration

• Formation of glucose

What converts nitrogen gas into a usable form for plants and animals?

• bacteria

• rain

• fungi

• car exhaust

How is nitrogen "fixed" into a usable form for plants?

• Through action of bacteria only

• Through lightning only

• Through action of bacteria and lightning

• Through photosynthesis

What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

• nitrogen composition

• nitrogen fixation

• ammonia

• denitrification

Plants and animals need nitrogen to make __________.

• Protein
• Carbohydrates
• Lipids
• Minerals

Pseudoscorpions often hitch rides on the backs of large beetles or true bugs. What is the ecological relationship?

• Mutualism
• Commensalism
• Parasitism
• Cooperation