?

AP® Biology

Free Version

Upgrade subject to access all content

Moderate

Recycling Nitrogen in the Biosphere

APBIO-YJ4JEE

One of the essential elements that is a part of the basic building blocks of all living things is nitrogen.

What helps recycle nitrogen through the biosphere and make it available to living organisms?

A

Denitrifying bacteria found on the plant roots of legumes that convert nitrogen in the atmosphere into nitrogen in the soil.

B

Nitrogen-fixing bacteria found on the plant roots of legumes that convert nitrogen in the atmosphere into nitrogen in the soil.

C

Nitrogen-fixing bacteria found on the plant roots of legumes that return nitrogen in the soil back into the atmosphere.

D

Denitrifying- bacteria found on the plant roots of legumes that return nitrogen in the soil back into the atmosphere.