Nitrogen Cycle Quiz

Why do plants and animals need a supply of nitrogen?

• To make carbohydrates

• To make proteins

• To make fats

• To make vitamins

Answer explanation

Plants and animals need a supply of nitrogen to make proteins, which are essential for growth, repair, and various metabolic functions in their bodies.

How do plants obtain their nitrogen?

• From the air in the form of nitrogen gas

• From the soil in the form of nitrates

• By eating other plants

• By eating animals

Answer explanation

Plants obtain their nitrogen from the soil in the form of nitrates.

How do animals obtain their nitrogen?

• By breathing in nitrogen gas

• By absorbing it through their skin

• By eating plants or other animals

• By drinking water

Answer explanation

Animals obtain their nitrogen by eating plants or other animals.

In what form can nitrogen in the air be converted?

• Nitrates

• Nitrites

• Ammonia

• Proteins

Answer explanation

Nitrogen in the air can be converted into Nitrites.

What is the process of converting nitrogen into compounds that can be used by plants and animals called?

• Carbon Cycle

• Water Cycle

• Nitrogen Cycle

• Oxygen Cycle

Answer explanation

The process of converting nitrogen into compounds that can be used by plants and animals is called the Nitrogen Cycle.

Why is nitrogen considered essential in biological systems?

• It is a major component of carbohydrates.

• It is a major component of lipids.

• It is a major component of DNA, RNA, and proteins.

• It is a major component of vitamins.

Answer explanation

Nitrogen is considered essential in biological systems because it is a major component of DNA, RNA, and proteins.

By traveling through one of the ________ processes in the Nitrogen Cycle!

• Three

• Four

• Five

• Six

Answer explanation

The correct answer is 'Four' because nitrogen travels through four processes in the Nitrogen Cycle.

What is the process called in which the N₂ compound in the atmosphere breaks and combines with other compounds?

• Nitrogen Fixation

• Photosynthesis

• Respiration

• Combustion

Answer explanation

The process called Nitrogen Fixation involves the breaking of N₂ compounds in the atmosphere to combine with other compounds.

During nitrogen fixation, nitrogen is "fixed" when it combines with which elements?

• Hydrogen or Oxygen

• Carbon or Hydrogen

• Oxygen or Carbon

• Nitrogen or Hydrogen

Answer explanation

During nitrogen fixation, nitrogen is 'fixed' when it combines with Hydrogen or Oxygen, making them the correct elements for the process.

• Lightning strikes

• Industrial production

• Special bacteria

• Chemical manipulation

Answer explanation

The main process that converts nitrogen gas to ammonia is through special bacteria, which perform the biological process known as nitrogen fixation.