Popuations and Ecosystems Review

Which statement describes an interaction between plants and animals?

• Plants produce CO2 for humans to breathe.

• Humans exhale CO2 for plants to use.

• Plants provide atmospheric nitrogen for humans.

• Humans release oxygen for plants to use.

Which process removes carbon from the atmosphere?

• burning

• photosynthesis

• respiration

• decomposition

Which cycle is most directly related to the combustion of fossil fuels?

• rock cycle

• water cycle

• carbon cycle

• nitrogen cycle

Organisms from which niche contain the greatest amount of energy?

• producers

• decomposers

• primary consumers

• secondary consumers

How does nitrogen from the atmosphere become beneficial to plants?

• nitrogen must be mixed in the soil by earthworms.

• Nitrogen must be converted into a useful form by bacteria.

• Nitrogen must come in contact with decaying organic material.

• Nitrogen must come in contact with the ground through rainfall.

How do most nutrients get back into the soil in the forrest?

• organic matter is recycled from dead organisms.

• humans apply fertilizers.

• Solar radiation reaches the ground.

• Rainwater drips off living organisms.

Which process of the water cycle transports water from plants to clouds?

• precipitation

• condensation

• transpiration

• sublimation

The arrows in a food chain represent the direction of the flow of ____.

• energy

• water

• carbon dioxide

• oxygen

Which 2 things are produced when a plant breaks down sugar to release energy? (cellular respiration)

• CO2 and H2O

• O2 and CO2

• CO2 and food

• O2 and food

What is the primary source of energy for most living organisms?

• the sun

• plants

• soil

• the moon