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Competition - post a photo you've taken of nature >>
Competition - post a photo you've taken of nature >>
Competition - post a photo you've taken of nature >>

Cambridge IGCSE Biology (May/June) Official Thread

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Original post by DJShaji
eugh I wrote use water instead of alcohol to show that catalase does infact work with hydrogen peroxide :frown:


It is correct too!
Original post by Kai Sun
Yeah, I reckon you are right.
This is what I did -_-
http://prnt.sc/b0cjt0


Hey you made it correct! I also made it in same manner
Reply 22
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Kai Sun
Original post by examhater44
How many marks was the delivery tube one?
I think it was 1 mark but just clarify if I'm wrong

I got magnification to be 1.59, that's a valid answer right?


I think it was 1 mark only.
The magnification should be fine, a bit on the small side but valid.
Reply 23
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Kai Sun
@Mohammad imtiaz


That's a relief, coz it was worth like 4-5 marks :smile:
Original post by Kai Sun
I think it was 1 mark only.
The magnification should be fine, a bit on the small side but valid.


Yeah, many people said anything bigger than 1x should be fine
Original post by Kai Sun
@Mohammad imtiaz


That's a relief, coz it was worth like 4-5 marks :smile:

Ya it was of 5 marks btw what you wrote in the last question about xylem vessel where we uad to use a red dye which worth 4 marks
Reply 26
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Kai Sun
Original post by Mohammad imtiaz
Ya it was of 5 marks btw what you wrote in the last question about xylem vessel where we uad to use a red dye which worth 4 marks


. The plant is placed in a bath of water with red dye
. Transpiration pull brings the water through xylem in a dry, warm room
. The red dye stains the xylem walls
. The stem of the plant is laterally cut open revealing the vascular bundle
. Vascular bundle is examined under a light microscope, revealing the stained xylem tube.

I think this is enough for full marks.
Well well that paper 4 today was a shocker. More like a geography paper tbh. And what was all that with fish farming. Actually hilarious.
Lol everything related to this is written in chapter ecosystem and luckily,I read that chapter with full concentration and I hope I would get A*.In my opinion paper was easy except first question

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