1 idea of decay / decomposition ;
e.g. breakdown by, (saprophytic) bacteria / fungi
2 legumes eaten by, detritivores ; A named detritivores
3 decomposers produce proteases ;
4 to, hydrolyse / convert / change / AW, protein to amino acids ;
5 amino acids are deaminated ;
7 nitrifying bacteria / Nitrosomonas, convert ammonia to nitrite (ions);
8 nitrifying bacteria / Nitrobacter, convert nitrite to nitrate (ions) ;
if mp7 or mp8 not awarded allow one mark for the following as mp9
9 (named) nitrifying bacteria convert, ammonia / ammonium, to nitrate
(ions) ;
mp10 only to be awarded following nitrification
10 nitrate (ions) used for making, amino acids / proteins (hence increase in
growth of cereals) ;