Cycling of Matter

Front

What do plants and animals need nitrogen to make?

Back

Protein

Front

Can organisms absorb nitrogen gas directly out of the atmosphere?

Back

No

Front

What is photosynthesis?

Back

A cell process that uses energy from sunlight to convert water and carbon dioxide into food.

Front

How do animals obtain nitrogen stored in plants?

Back

They eat the plants.

Front

What converts nitrogen into a form that plants can absorb?

Back

Nitrogen fixing bacteria.

Front

What is the role of nitrogen fixing bacteria in the nitrogen cycle?

Back

They convert atmospheric nitrogen into ammonia, which plants can absorb.

Front

What is the process by which plants release oxygen into the atmosphere?

Back

Photosynthesis.

Front

What is the main source of nitrogen for plants?

Back

Nitrogen in the soil, primarily from decomposed organic matter.

Front

What is the significance of decomposers in the cycling of matter?

Back

Decomposers break down dead organisms, returning nutrients to the soil.

Front

What is the difference between nitrification and denitrification?

Back

Nitrification is the conversion of ammonia into nitrates, while denitrification is the conversion of nitrates back into nitrogen gas.