Igcse Nitrogen Cycle and Eutrophication

Which kind of organisms are decomposers?

• Bacteria and fungi

• Fungi and insects

• Insects and bacteria

Which group of bacteria use nitrogen gas from the air to produce their own nitrate?

• Denitrifying bacteria

• Nitrifying bacteria

• Nitrogen-fixing bacteria

The diagram below shows part of the nitrogen cycle.

Which stage is nitrification?

• Stage A

• Stage B

• Stage C

Tags

NGSS.MS-LS2-3

What molecules do plants produce using nitrogen?

• Fats

• Proteins

• Sugars

Tags

NGSS.MS-LS1-7

In which form do animals gain nitrogen?

• Ammonium

• Nitrate

• Protein

In which form is nitrogen taken up by non-legume plants?

• Nitrogen gas from the air

• Nitrates from the soil

• Protein from the soil

Tags

NGSS.MS-LS2-1

The diagram below shows part of the nitrogen cycle.

Which stage is decomposition?

• 2

• 3

• 4

Tags

NGSS.MS-LS2-3

Which reaction shown below is carried out by denitrifying bacteria?

• nitrate to nitrogen gas

• ammonium to nitrate

• nitrogen gas to ammonium

Tags

NGSS.HS-LS2-3

Why do decomposers break down plant and animal waste products?

• To keep the nitrogen cycle going

• To produce ammonium

• To obtain energy

Tags

NGSS.MS-LS2-3

The diagram below shows part of the nitrogen cycle.

Which of the numbered stages involve bacteria?

• 1 and 3

• 3 and 4

• 2 and 4

Tags

NGSS.MS-LS2-3