APES Unit 1 Ecosystems

Front

What are the two major processes involved in the nitrogen cycle?

Back

Fixation and denitrification.

Front

Why do carbon dioxide levels decrease in summer?

Back

CO2 levels decrease in summer because there is more photosynthesis.

Front

What is a possible positive consequence of an increase in CO2 in the atmosphere?

Back

Plants may grow faster and produce more sugars.

Front

What is an example of an abiotic factor affecting a biotic component?

Back

Phosphorous content in soil affecting plant growth.

Front

If gross primary productivity is 5 gC/m²yr and producers need 1.5 gC/m²yr for respiration, what is the net primary productivity?

Back

3.5 gC/m²yr.

Front

Define gross primary productivity (GPP).

Back

The total amount of carbon fixed by photosynthesis in a given area and time.

Front

Define net primary productivity (NPP).

Back

The amount of carbon that remains after plants have met their own respiration needs; NPP = GPP - respiration.

Front

What role do decomposers play in an ecosystem?

Back

Decomposers break down dead organic matter, recycling nutrients back into the ecosystem.

Front

What is the significance of the carbon cycle?

Back

The carbon cycle regulates climate and supports life by cycling carbon through the atmosphere, biosphere, and geosphere.

Front

How does photosynthesis affect atmospheric CO2 levels?

Back

Photosynthesis removes CO2 from the atmosphere, reducing its concentration.