Nitrogen Cycle Practice Flashcard [7th Grade]

Front

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

Back

Rhizobium bacteria convert nitrogen gas from the atmosphere into ammonia, which plants can use.

Front

True or False: Dead plants and animals excreta do not contain nitrogenous waste.

Back

False. Dead plants and animals, as well as their excreta, contain nitrogenous waste.

Front

What do nitrogen-fixing bacteria help plants to do?

Back

They help plants use ammonia and nitrate, which are usable forms of nitrogen.

Front

What natural phenomenon can transform atmospheric nitrogen into a usable form?

Back

Lightning can transform nitrogen in the atmosphere into a usable form.

Front

What is the function of denitrifying bacteria in the nitrogen cycle?

Back

Denitrifying bacteria change nitrate back into nitrogen gas, completing the nitrogen cycle.

Front

Define nitrogen fixation.

Back

Nitrogen fixation is the process of converting nitrogen gas from the atmosphere into ammonia or related compounds in soil.

Front

What is the significance of nitrates for plants?

Back

Nitrates are essential nutrients that plants absorb from the soil to grow and develop.

Front

How do plants obtain nitrogen?

Back

Plants obtain nitrogen primarily through the absorption of nitrates and ammonium from the soil.

Front

What is the process of decomposition in the nitrogen cycle?

Back

Decomposition is the breakdown of dead organic matter, releasing nitrogen back into the soil as ammonia.

Front

What role do decomposers play in the nitrogen cycle?

Back

Decomposers break down dead organisms and waste, returning nitrogen to the soil in the form of ammonia.