Thought it was OK, some questions were hard tho. What questions stumped you?
I thought it wasn't easy, the problem is after you answered it you don't know whether you got the mark or not.
Really not sure what i could get, some has appeared in the past papers, but set in different styles.
Ecosystems paper yes?
I thought it was ok at first, then afterwards in discussion with my friends found that i had screwed up quite a few marks. Like the distribution question-i had written about the three different types of distribution-directional etc.
And the gene mutiations thing...i wasnt sure if it meant point mutations and... or things like substitution/deletion of bases. I put the latter.
wasnt to bad. Some questions were quite tricky. You lot think the grade boundary will go down a bit?
i dont think it was continuous variation. i thought it was discontinuous
nitrate to ammonia is nitrification
nitrate to nitrogen gas is denitrification
Yeah i know it was denitrification but it wasnt nitrification cus it didnt ask you ammonia to nitrate it asked nitrogen to ammonia which is ammonification. My friends reakoned it was continuous cus apparently it was on about lengths and thats continuous data discrete is when you have set values.....tho i thought the graph had to be a normal curve to be continuous.
i put has cell membrane and nuclues. beacause not all protoctista have cell walls
I thought it was continuous variation on the graph because the bars were joined together...I thought discontinuous variation graphs had bars that were separate from each other / had spaces between them...could be wrong though
Most of us thought it was a bit wierd - what did you people get for the advantage of the standard deviation over the range?
I got it as continuous variation coz salmon dont have set sizes! they can vary in length.
I also got the stuctural features of protoctista as linear chromosomes and membrane-bound organelles.
Okay, I thought overall it was a hard paper compared to past ones, but it was okay.
The graph showed DISCONTINUOUS VARIATION it wasn't continuous as there were seperate bars - they were in class intervals and hence it was discrete data. To continuous a curve would have to be present.
The nitrogen one was: nitrogen fixing and denitrification.
RQ: anaerobic converts pyruvatee to ethonal and carbon dioxide - hence more carbon dioxide is produced giving a higher RQ value.
For the Protocista one i put: nucleus and membrane bound organelles.
The gene one wanted base substitution and base deletion/addition.