Nitrogen Cycle

Question 1

Nitrogen

Answer 1

Nitrogen in the air cannot be utilised by animals. However nitrogen is needed for growth repair and maintenance

Question 2

Nitrogen fixation

Answer 2

through lightning: Harber process-making fertilizer: nitrogen fixing bacteria in root nodules of leguminous plants

Question 3

Nitrifying bacteria

Answer 3

ammonia  nitrite  nitrate

Question 4

Denitrifying bacteria

Answer 4

nitrate  N2 gas
Nitrogen in animals and plants is in the form of amino acids and proteins. As one organism eats another along the food chain, the nitrogen passes from one organism to the other

Question 5

Consequence introduced trout:

Answer 5

Introduced species
Trout has no natural predators
Organisms in the lake have no adaptions to cope with trout
Trout will eat smaller organisms with no defences
Trout will out compete organisms for food

Question 6

Change in temperature can cause reduction in suitable habitat:

Answer 6

Increase in bush fires
Loss of shelter
Loss of biodiversity
Less water supply
Loss of vegetation