I don't think so as the hydrogen peroxide is removed afterwards. I think the answer was that hydrogen peroxide does not kill disease-causing bacteria so such bacteria could still linger in the milk causing harm to those who consume it. I may be wrong however! You may still get the mark (it's only 1 mark so it doesn't really matter!)

Reply 124

ihatehannah

omg I'm such an idiot , for the 6 marker, i wrote measure the starting height of pondweed then after a week measure the final height using diff intensities of light, cud that still be right?? thank god b3 was easy , saved my a* grade for biology.

Reply 125

AK45HSR

Original post by Redcoats

For advantages and disadvantages of the hydrogen peroxide method, I put it would cause less environmental damage (as the other method worked at 138 degrees) and the disadvantage was that hydrogen peroxide can not kill disease causing bacteria so may not be able to kill some bacteria present in the milk (which are threatening to humans). Is this correct?

I certainly hope so as that's exactly what I wrote.

Reply 126

AK45HSR

Original post by Nathyboyyy

The pictograms was easy to work out, no knowledge needed-
Starts at 6.6
Doubles at B to 13.2
Cell splits first time back to 6.6 at C
Splits again to 3.3 at E

Hope that helps

That's what I put, but what was the thing for the egg? I put 6.6 as a guess, not quite sure how we were supposed to know?

Reply 127

Graphittte

I said that you should measure the pondweed's growth when it was in a dark room amd when it wasn't. Such a fool! :colondollar:

Reply 128

babymarima

Original post by ihatehannah

did exactly the same, I didn't revise that kind of measuring at all so I was jsut guessing my way through

Reply 129

Zxe

For the six marker i put the control variables as co2 and temperature of room is that okay?

Reply 130

AK45HSR

Original post by Zxe

For the six marker i put the control variables as co2 and temperature of room is that okay?

It is a control variable, but not one that you can control very easily so I was unsure.

Reply 131

coreHelp

this is so sloooooooooooooww

Reply 132

sahil19

Worst Case; 33
Best Case;47
Most Likely; 41

Reply 133

AK45HSR

Has anyone managed to complete a mark scheme?

Reply 134

clorenzoni5

Original post by Naco88

I got that the athlete ran for 1.5 minutes.

wasnt it supposed to be 1 min? since the heart rate stays high for a bit after u exercise, before it decreases?

Reply 135

Cakes717

Original post by Edgerulezs

Lol I got 1min for how long he was running cause it levelled off...

That's what i did aswell. I put 1.5 first then crossed it out...🙄

Reply 136

Oasis61

I didn't see any ginger 1/4 question????

Posted from TSR Mobile

Reply 137

ozziess

Yeah you forgot to convert the cm to m by dividing by 100. If 62.5 was for 20 then 1 would be something way smaller, not larger.
Happens :/

Reply 138

GCSE_core

Okay thanks! I was just checking as someone had the advantages and disadvantages of enzymes as one question and then the advantages and disadvantages of hydrogen peroxide as another one?

Original post by goldenusername

yepah i think so