Unit 2 Assessment Review

Front

What is nitrogen fixation?

Back

The process by which nitrogen in the atmosphere is converted into ammonia or related nitrogenous compounds in soil, making it available for use by plants.

Front

Why is ammonia important for plants?

Back

Ammonia is a form of nitrogen that plants can absorb and use to synthesize proteins and other essential compounds.

Front

What is the most abundant gas in Earth's atmosphere?

Back

Nitrogen, making up about 78% of the atmosphere.

Front

What happens to temperature as altitude increases?

Back

Temperature generally decreases with an increase in altitude in the troposphere.

Front

What are Earth's main spheres?

Back

The main spheres are the lithosphere (land), hydrosphere (water), atmosphere (air), and biosphere (life).

Front

Can nitrogen be absorbed directly from the atmosphere by plants?

Back

No, plants cannot absorb nitrogen directly from the atmosphere; they need it in a fixed form like ammonia or nitrates.

Front

What is the lithosphere?

Back

The lithosphere is the rigid outer layer of the Earth, consisting of the crust and upper mantle.

Front

What is the biosphere?

Back

The biosphere is the global sum of all ecosystems, where life exists, including land, water, and the atmosphere.

Front

What is the atmosphere?

Back

The atmosphere is the layer of gases surrounding the Earth, essential for life and weather.

Front

What is the hydrosphere?

Back

The hydrosphere encompasses all water on Earth, including oceans, rivers, lakes, and water vapor.