IGCSE Edexcel Biology - Nitrogen Cycle

Question 1

Denitrification

Answer 1

Converting from nitrates to nitrogen

Question 2

Assimilation

Answer 2

Occurs inside plants

Using nitrates to make more complex proteins

Question 3

Nitrification

Answer 3

Converting ammonium to nitrites / nitrates

Question 4

Decomposition

Answer 4

Bacteria / fungi break down dead animal / plants (+ their waste) into ammonium / ammonia (releasing it into the soil)

Question 5

Nitrifying Bacteria

Answer 5

Bacteria that convert ammonium / ammonia into nitrates / nitrites

Question 6

Denitrifying Bacteria

Answer 6

Bacteria that convert nitrates into nitrogen

Question 7

Nitrogen Fixation

Answer 7

Converting nitrogen to ammonium / ammonia

Question 8

Nitrogen Fixing Bacteria

Answer 8

Bacteria that convert nitrogen to ammonium / ammonia

Question 9

Nutrition

Answer 9

Animals eating plants

Nitrates move from plants to animals, where it is digested.

Question 10

Ammonification

Answer 10

Converting nitrogen to ammonium / ammonia.

Question 11

Leguminous plants

Answer 11

Plants with root nodules containing nitrogen fixing bacteria

Question 12

Root nodules

Answer 12

Roots containing nitrogen fixing bacteria (in the leguminous plants)

Question 13

Decomposers

Answer 13

Bacteria and fungi

Break down dead animals and plants and their waste