I think Rosen is a bit unfair. (I have a feeling he also doesn't like children learning to read being given decodable books). If exams are going to be 'fair' it can't just be 'the examiner liked your answer' can it? - That is too subjective. So being clear on mark schemes is important as then everyone can have access to the information, not just those at independent schools whose teacher are 'in the know'.
I know subject specific terminology is a pain (my DDs struggles with it too), but to share ideas effectively in technical subjects I do think specific terminology is important. e.g. 'Electrons orbit the nucleus' not 'the negative thingies whizz round the middle bit', etc.
In Rosen's example, it was presumably a comprehension test and not a biology one.
That said, I haven't encountered the new specs, so it could be that they are way OTT in their prescriptiveness. 
Good luck to all the DC this week.