Cycles

Question 0

Decomposition produces

Answer 0

Ammonia from proteins and minerals

Question 1

Nitrogen atoms passed on by

Answer 1

Passed along food chains

Question 2

Nitrifying bacteria

Answer 2

Oxidises the ammonia to nitrates during nitrification

Question 3

Plants use nitrates for

Answer 3

Their roots absorb nitrates and use them to make proteins

Question 4

Carbon cycle

Answer 4

Photosynthesis fixes carbon from the atmosphere into organic molecules
These are passed along food chains

Respiration releases the carbon dioxide back into the atmosphere
Burning of fossil fuels releases carbon dioxide back into the atmosphere