Biogeochemical Cycles

Front

Identify the cycle pictured: The Nitrogen Cycle, The Water Cycle, The Carbon Cycle, The Phosphorous Cycle

Back

The Carbon Cycle

Front

How does carbon dioxide leave the atmosphere and become part of the food chain?

Back

through photosynthesis

Front

How do animals get the carbon they need?

Back

Eating plants

Front

What role do animals play in the carbon cycle?

Back

give off carbon dioxide through respiration

Front

What is one way that carbon dioxide can be put back into the atmosphere? Options: sunlight, burning of fossil fuels, ocean currents, rain

Back

burning of fossil fuels

Front

How have humans contributed to the amount of carbon dioxide in the air?

Back

All of these: driving cars, burning fossil fuels, factories.

Front

Identify the cycle pictured: the water cycle, the carbon cycle, the nitrogen cycle, the phosphorous cycle.

Back

the nitrogen cycle

Front

Where do animals get nitrogen from? Options: from the soil, from the water they drink, directly from the air, from the plants they eat.

Back

from the plants they eat

Front

Bacteria in the soil convert nitrogen in the atmosphere into a form that plants can use.

Back

True

Front

Nitrogen in the atmosphere is not available. Free nitrogen has to be changed into a usable form in a process called ____

Back

nitrogen fixation