NITROGEN CYCLE

Question 1

they constitute around 78% of the air and cannot be used directly by plants and animals

Answer 1

atmospheric nitrogen

Question 2

nitrogen needs to get converted to nitrogenous compounds

Answer 2

nitrogen fixation

Question 3

they live in the nodules of leguminous plants that converts nitrogen to ammonia

Answer 3

rhizobium bacterium

Question 4

they convert ammonia to nitrites and then nitratess

Answer 4

nitrifying bacteria

Question 5

process of adding oxygen to ammonia which soon converted into nitrates

Answer 5

nitrification

Question 6

nitrogen fixation can also occur by

Answer 6

lightning strikes

Question 7

process of plants take nitrates to make proteins for animals to eat

Answer 7

assimilation

Question 8

what happens when dead plants and animal wastes decay?

Answer 8

they releases ammonia (ammonification)

Question 9

ammonia gets converted back to nitrates, some plants absorb it while the other remaining goes to

Answer 9

denitrifying bacteria to convert them back to atmospheric nitrogen (denitrification)