XtremePapers

Repeating the experiment is correct and im not pretty sure about the control...but dnt worry u will get the mark....

yayy lol btw i have written two points and this question was of only 1 mark so if God forbid one point of mine is incorrect and the other correct will i be rewarded ? + there was another question about why oil layer was there to prevent air from coming in ? what was its answer ?

Well we cnt say da part abt da control in ur answer as completly incorrect.... normally edexcel will cut marks for writting incorrect facts but i dnt thnk ull get oealized for it...and da answer for the second one is so dat da yeast will be able to respire anaerobically....
Bttw where ru doin the paper from? And ru doin English as a first language? If so is ur syllabus Section A or B?

since it was of 2 marks i gave two points
1) to prevent yeast from respiring aerobically
2) to prevent contamination of yeast by other micro organisms and syllabus is B, i am doing IGCSE from Pakistan.

Well i wrote smethin else for dat i believe.... oh ok...which means u guys dnt hav anthology? and hav seen passages?

unseen passages

oh btw what was the answer of question that was about natural selection, why wasp borers have evolved to be like wasp ?

oh ok.... umm dat question u had to think abt it generally and den ryt abt da selction presure frm da predators and den da ones with da stings had a selective advantage and den more of them survived dan the ones who lacked em and den generations more of the wasps started gettin stings and evolved to luk lyk da ash borer....

oh no sorry sorry lol it was why do ash borers look similar to wasps lol