nitrogen cycle

Question 1

what is nitrogen needed for

Answer 1

to make proteins

Question 2

step one

Answer 2

nitrogen is in the atmosphere as N gas (N2) but can’t be used

Question 3

step two

Answer 3

symbiotic bacteria fix the gas into Nitrate (NO3-) which the plants can absorb

Question 4

step 3

Answer 4

plants are eaten by animals which absorb the nitrate

Question 5

step four

Answer 5

the animals for and bacteria return ammonia (NH3) to the soul (decomposers)

Question 6

step five

Answer 6

bacteria convert ammonia to Nitrates (nitrification)

Question 7

step six

Answer 7

bacteria convert nitrate into nitrogen gas (denitrification)