Understanding the Nitrogen Cycle

The video explains the concept of nitrous oxide, also known as laughing gas, and its composition of nitrogen and oxygen. It delves into the nitrogen cycle, highlighting how nitrogen is abundant in the atmosphere but needs to be fixed by bacteria or lightning to be usable by plants. The video further explains how plants and animals obtain nitrogen and how it returns to the soil and atmosphere, completing the nitrogen cycle. The video concludes with a mention of additional resources available on makemgenius.com.

What is the main component of the air we breathe?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Hydrogen

Which gas is known as laughing gas?

• Carbon dioxide

• Nitrous oxide

• Methane

• Oxygen

Why can't we use nitrogen directly from the air?

• It is too cold

• It needs to be fixed into other compounds

• It is too heavy

• It is toxic

What is the term for the conversion of nitrogen gas into ammonia?

• Nitrification

• Ammonification

• Denitrification

• Nitrogen fixation

What is the role of legumes in the nitrogen cycle?

• They release nitrogen into the air

• They convert nitrogen into oxygen

• They have bacteria in their roots that fix nitrogen

• They store nitrogen in their leaves

What is the role of bacteria in the nitrogen cycle?

• They convert nitrogen into oxygen

• They absorb nitrogen from the air

• They release nitrogen into the soil

• They fix nitrogen into usable forms

How do animals primarily obtain nitrogen?

• By absorbing it through their skin

• By drinking water

• By breathing it in

• By eating plants

What happens to nitrogen when animals produce waste?

• It is absorbed by the sun

• It evaporates into the air

• It returns to the soil

• It turns into oxygen

What process allows nitrogen to return to the atmosphere?

• Evaporation

• Denitrification by bacteria

• Photosynthesis

• Condensation

What is the final step in the nitrogen cycle?

• Nitrogen returns to the atmosphere

• Nitrogen is fixed by bacteria

• Nitrogen is absorbed by plants

• Nitrogen is consumed by animals