Dat Destroyer (2011) Bio #89

[Dusk]

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So the questions asks Nitrogen fixation occurs in which structure?

And the answer is the root nodule.

I have no problem with that, but in the solutions, it says nitrogen fixation fixes N2 to NH4+

I thought it was NH3?? If I understand this correctly, do nitrogen fixing bacteria convert N2 to NH4+ or NO3- And nitrogen fixing plants convert N2 to NH3?

 

[Golfguy]

Nitrogen fixing create NO3. Nitrifying create NO3, with an intermediate NO2 intermediate I think. Rhizobia a fixers. Lightning also converts to NO3. NH3 is typically waste or produced by bac. of decay. Check out a Kaplan diagram, or wiki.

 

[Dusk]

Nitrogen fixing create NO3. Nitrifying create NO3, with an intermediate NO2 intermediate I think. Rhizobia a fixers. Lightning also converts to NO3. NH3 is typically waste or produced by bac. of decay. Check out a Kaplan diagram, or wiki.

thank you!!

 

[rmm30]

Nitrogen Fixation:
N2 ---> NH4+ (via nitrogen fixing bacteria in root nodules)
N2----> NO3- (via UV radiation or lightning)

Nitrification:
NH4+, or NO2- ----> NO3-

Denitrification:
NO3 ----> N2

It's worth noting that the roots of plants can only absorb Nitrogen in the form of Ammonium or Nitrate.

There's plenty more to learn about the global nitrogen cycle but this is just a straightforward breakdown to keep in your head bc it's confusing (at least to me).