Skip to content

Course home

Sign up

Ecosystems

EasyMedium
123456789101112131415161718192021222324252627
Question 17

Nitrobacter is a genus of chemoautotrophic bacteria essential for maintaining soil fertility in terrestrial ecosystems.

Which nitrogen cycle reaction is carried out by Nitrobacter?

A

N2+8H++8e−→2NH3+H2\text{N}_2 + 8\text{H}^+ + 8\text{e}^- \rightarrow 2\text{NH}_3 + \text{H}_2N2​+8H++8e−→2NH3​+H2​

B

2NH4++3O2→2NO2−+4H++2H2O2\text{NH}_4^+ + 3\text{O}_2 \rightarrow 2\text{NO}_2^- + 4\text{H}^+ + 2\text{H}_2\text{O}2NH4+​+3O2​→2NO2−​+4H++2H2​O

C

2NO3−+12H++10e−→N2+6H2O2\text{NO}_3^- + 12\text{H}^+ + 10\text{e}^- \rightarrow \text{N}_2 + 6\text{H}_2\text{O}2NO3−​+12H++10e−→N2​+6H2​O

D

2NO2−+O2→2NO3−2\text{NO}_2^- + \text{O}_2 \rightarrow 2\text{NO}_3^-2NO2−​+O2​→2NO3−​

Markscheme

Ecosystems Questions

  1. A Level
  2. /Biology
  3. /Ecosystems

37 exam-style questions on OCR A A Level Biology Ecosystems. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank