Inglise keel unit 5 answers
functions, at optimal rate / more efficiently, at lower pH;
ref. to presence of fatty acids changing pH;
ref. to ionic bonds breaking (in soluble lipase); ora
AVP; e.g. ref to industrial uses
ref to effect on R groups max 4
[5]
14. (a) starts with previously uncolonised area / bare ground / bare rock / AW;
ref to pioneer species / named pioneer;
series of recognisable, seres / stages;
progresses to, climax / final equilibrium stage; max 2
(b) stabilise environment;
soil development / increase humus / organic material;
change soil pH;
hold more water;
release more minerals or nutrients / increase N content or fix N / hold
annaabi.ee 
