AQA A Level Biology Paper 2 7402/2 - 17 Jun 2022 [Exam Chat]

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Original post by sunshine11111

dw it said no change to apparatus

I said add oil layer to prevent co2 entering to make condition anaerobic so probably wrong lol

Original post by JenishaAnilkumar

21.6

I got this then I read the question again so crossed it out

medapp202222222

Original post by fridacatlo

Exactly, that's what confused me. So for some reason I put remove KOH, replace with water(?) and record the change in pH? Idk why I said that

i don’t think u needed to remove KOH, cuz isn’t volume of O2 taken in = volume of CO2 released, so it wouldn’t have mattered i don’t think

Original post by Minmin1234

I thoguht urine would be more concentrated if ADH levels rise

wasnt the question about the symptoms asking about less adh

Original post by JenishaAnilkumar

Omds I was gonna write sealed but I didnt :frown:

:frown:

Original post by fridacatlo

Exactly, that's what confused me. So for some reason I put remove KOH, replace with water(?) and record the change in pH? Idk why I said that

The question about the practical specifically talked about the contents in the apparatus so would it not be referring to something to do with the seeds?

Original post by Mystic_karri

i got 1/8

the probability was 0.5 as the mother of was homozygous recessive and the dad heterozygous then you multiply by 0.5 for the son so it’s 0.25

JenishaAnilkumar

How much do you guys think an A* will be this year? I think 65% but I hope its lower

medapp202222222

Original post by anon17178

wasnt the question about the symptoms asking about less adh

yeah i thought that to

soo hows everyone revising paper 3 since anything can come up

Original post by Minmin1234

Hi I said to remove the koh so it doesn’t absorb the co2 and then I said to use a gas syringe to measure it but to make sure it’s sealed so no oxygen can enter

But if theres no o2 in the system then theres no aerobic respiration. So youll have to do anaerobic respiration and you cant remove o2 unless you put the seed in a vaccum which is not possible.

Original post by JenishaAnilkumar

How much do you guys think an A* will be this year? I think 65% but I hope its lower

i really do think itll be lower,coz so many ppl are finding it hard

Original post by sunshine11111

i really do think itll be lower,coz so many ppl are finding it hard

how did u find paper 2?

medapp202222222

Original post by sunshine11111

i really do think itll be lower,coz so many ppl are finding it hard

what do u guys reckon an A will be %

Original post by sunshine11111

i really do think itll be lower,coz so many ppl are finding it hard

not what the poll suggests

JenishaAnilkumar

Original post by sunshine11111

i really do think itll be lower,coz so many ppl are finding it hard

Ah okay! I failed maths so I need to make up for it with bio

Original post by Bayan19

the probability was 0.5 as the mother of was homozygous recessive and the dad heterozygous then you multiply by 0.5 for the son so it’s 0.25

i think 1/8 as asked about blood type, gender and the Rr condition, none of them was linked

Original post by Bayan19

the probability was 0.5 as the mother of was homozygous recessive and the dad heterozygous then you multiply by 0.5 for the son so it’s 0.25

Wasn’t it asking for probability of a son (50 %) with resus positive (50%) and type A blood (50 %)
so 0.5 * 0.5 * 0.5 = 0.125 or 1/8th

I got 1/4 but I was convinced I did it wrong

(edited 1 year ago)

JenishaAnilkumar

Original post by medapp202222222

what do u guys reckon an A will be %

55%

Original post by Lucy.may2

how did u find paper 2?

not great lol, but defo better than paper 1, i dont even know why my brain broke down in paper 1. but yh i feel like i did okay, i already know i lost some marks for sure , like i said dna primer not probe and i wanna throw myself out the window for that

JenishaAnilkumar

Original post by Person 123

not what the poll suggests

I mean this is tsr lol everyones smart

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