Nitrogen cycle

Question 1

How is nitrogen gas in the atmosphere fixed into nitrogen compounds that can be used by organisms?

Answer 1

nitrogen fixation by lightning and nitrogen fixing bacteria - also by Humans in a process called the Haber process used to make artificial fertilisers.

Question 2

Ammonium ions to nitrites

Answer 2

Nitrification

Question 3

Nitrites to Nitrates

Answer 3

Nitrification

Question 4

Nitrates to Nitrogen in the atmosphere

Answer 4

Denitrification

Question 5

nitrates to producer

Answer 5

absorption

Question 6

nitrogen in atmosphere to producer

Answer 6

nitrogen fixation

Question 7

producer to consumer

Answer 7

feeding and digestion

Question 8

producer and consumer to decomposer

Answer 8

death ( and excretion)

Question 9

decomposer to ammonium ions in ground

Answer 9

decomposition

Question 10

organisms involved in nitrogen fixation

Answer 10

nitrogen fixing bacteria

Question 11

organisms involved in nitrification

Answer 11

nitrifying bacteria

Question 12

organisms involved in denitrification

Answer 12

denitrifying bacteria

Question 13

organisms involved in decomposition

Answer 13

decomposers

Question 14

what benefits to leguminous plants of having root nodules containing nitrogen fixing bacteria

Answer 14

absorb more nitrogen and grow quicker

Question 15

two examples leguminous plants

Answer 15

clover and peas

Question 16

Which letter shows absorption of nitrates to make new nitrogen compounds for growth?

Answer 16

C

Question 17

Which letter shows where ammonification occurs converting nitrogen containining biological molecules into ammonium ions?

Answer 17

B

Question 18

Which letter shows denitrification?

Answer 18

D

Question 19

Which letter shows natural processes that can fix nitrogen from the atmosphere?

Answer 19

A

Question 20

How are nitrates used by plants for growth?

Answer 20

Soluble nitrates are absorbed by the roots and are assimilated to make amino acids. These then build proteins / enzymes which are necessary for growth.

Question 21

What is assimilation?

Answer 21

The formation of organic nitrogen compounds like amino acids, DNA or ATP from nitrates