Nitrogen cycle:

Question 1

What are mycoorhizae?

Answer 1

= contains root nodules- lugimonous plants
= provides an increased surface area for water and inorganic ions, and acts as a sponge by being able to easily absorb these- in xchange receiev organic proudcts

Question 2

Whwre is notrigen found?

Answer 2

= proteins
= DNA
= RNA
= ATP

Question 3

What are the stages?

Answer 3

= nitrogen fixing
=ammonification
= nitrification
= denitrification

Question 4

What is nitrogen fixing?

Answer 4

= nitrogem fixing bacteria
either done freely ijn the soil or by lugminous plant root nodules
= converts atmosphereic nitrogen (n2) into ammonium ions, Nh4+
=

Question 5

What is ammonification?

Answer 5

= organic nitrogen, from decomposition of proteins , DNA, urea etc
= converted into ammonium ions and released into the soil
= carried out by saprobionts, bacteria and fungi, that can digest waste extraceullarly
=

Question 6

What do saprobioants do?

Answer 6

= = extraceullar digestion
= secretes enzymes outside, dead material,
= products are then absorbed by the saprobioants
= nitrogen containing compounds

Question 7

What is nitrification?

Answer 7

= ammonium ions in the soil, are oxidised into nitrites and then into nitrates
= by nitrifying bacteria
= 2 stage oxidation reaction

Question 8

What is dentrification?

Answer 8

= converts nitrogens in the compounds, back into N2 gas
= not useful as cannot be absorbed by plants
= anaerobic bactera, conditions
=