Unit 3 Matter In Ecosystems

How is nitrogen returned to the atmosphere?

• lightening striking resulting in atmospheric fixation

• nitrogen fixing by bacteria

• denitrification by bacteria

• respiration by decomposers

What form of nitrogen is available to plants?

• waste

• nitrate

• ammonia

• nitrogen gas from the atmosphere

What roles do photosynthesis & respiration play in the carbon cycle?

• Photosynthesis adds CO2 to the atmosphere and respiration removes it

• Respiration adds CO2 to the atmosphere and photosynthesis removes it

• Photosynthesis & respiration both add CO2 to the ocean

• Photosynthesis adds carbon to the ground and respiration adds carbon to the water

How is human activity affecting the balance in the carbon cycle?

• Burning fossil fuels is adding more CO2 to the atmosphere

• Burning fossil fuels is removing more CO2 from the atmopshere

• Planting more trees is removing more CO2 from the atmosphere

• Dying is adding more carbon to soil

Which of the following accurately describes global climate change?

• An increase in CO2 in the atmosphere is trapping more of sun’s heat, causing the temperature on Earth to increase due to an increase in the greenhouse effect

• An increase in CO2 in the atmosphere is trapping less of sun’s heat, causing the temperature on Earth to decrease due to a decrease in the greenhouse effect

• An increase in CO2 in the atmosphere is increasing the amount of photosynthesis on Earth causing more oxygen production and an increase in the greenhouse effect

• An increase in CO2 is polluting the atmosphere, causing microorganisms on Earth to die

How is the movement of matter different from the movement of energy in an ecosystem?

• Energy flows one way and matter continually cycles

• Matter flows one way and energy continually cycles

• There is no difference, both energy and matter continually cycle

• Both energy and matter move one way but energy is lost as waste and matter is lost as heat