Section b: structured questions
the diagram shows a simple spinal reflex arc.
there are three errors in the drawing.
(a) explain what the three errors in the drawing are.(b)name the structures labelled a to c.
(c)what is found in structure b?
!

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

the answer is:

carbon dioxide