Nitrogen Cycle

Question 1

why is the nitrogen cycle important

Answer 1

the nitrogen cycle is important for plants to absorb nitrates necessary for their growth

Question 2

explain the nitrogen cycle

Answer 2

1) plants absorb the nitrates from the soil via their roots and the air via the root nodule bacteria
2) Nitrates are passed through animals when they feed on plants
3) Soil bacteria decompose dead animals and urea, allowing nitrates to enter the soil.
4) The nitrates in the soil can go back into the air, due to lightning.

Question 3

why do farmers use nitrates

Answer 3

to increase their growth

Question 4

Soil bacteria and other organisms decompose dead animals and what else to release nitrates into soil?

Answer 4

Urea

Question 5

what does nitrifying bacteria do

Answer 5

it converts ammonium into nitrates

Question 6

what is nitrogen fixation

Answer 6

nitrogen fixation is when bacteria in the plants root nodules ‘fix’ nitrogen into a useable form

Question 7

what do denitrifying bacteria do

Answer 7

denitrifying bacteria remove nitrogenous compounds from the soil and release the nitrogen back into the air

Question 8

what are the stages in the nitrogen cycle in which microorganisms are relied upon

Answer 8

1) Decomposition
2) Nitrification
3) Nitrogen fixation
4) Denitrifiction

Question 9

In the Nitrogen cycle, Nitrogen is transferred when

Answer 9

1) when lighting strikes soil, nitrogen is released back into the air
2) plants absorb nitrogen through their roots
3) Animals eat plants
4) Animals decompose

Question 10

The cycle of nitrogen through the ecosystem relies on what at many stages.

Answer 10

Microorganisms

Question 11

plants can get nitrates from the soil with the help of what?

Answer 11

with the help of root nodule bacteria