AS BIOLOGY P-33

[hassan110]

heard dilution was coming

 

[Malik777]

That is like always coming

 

[xxfarhaxx]

That is like always coming

for p33 no food test! frm wher did u hear ths, coz i heard food test is cumin!

 

[MinminDoris]

In the paper questions like suggest 3 modifications or list out 2 errors, can we write more than what they ask? like more than 3 modifications or errors.

 

[beeloooo]

hey guys please anyone ?

 

[sweetjinnah]

In the paper questions like suggest 3 modifications or list out 2 errors, can we write more than what they ask? like more than 3 modifications or errors.

its better not to waste tym and write only wat they have asked...like only three modifications nd not more than that

 

[Mariam Mohamed SX132]

Well instead of doing all this we can just share useful tips for the paper 3 exam!

 

[Ahmad Zaeem]

 

[Lymphocte]

i hear that thiis tym the ppr will b easier than the last tym,bt the question seems to b a bit confusing

 

[Alool]

for p33 no food test! frm wher did u hear ths, coz i heard food test is cumin!

mee too i heard that it's gonna be there

 

[xxfarhaxx]

ya im kinda of sure food tst is gonna b thr!!

 

[Ahmed Abdullah]

ya im kinda of sure food tst is gonna b thr!!

food test for 31

 

[Malik777]

Guyx Surely there would be food test but the question would not be exactly the food test it would be most probably the amylase and starch But Ia Tonight I 'll get full info

 

[beeloooo]

kindly post it here than , shall be thankful

 

[xxfarhaxx]

food test for 31

fr 33!

 

[siraj acharya]

i myt gt sum info on ths 2mrw! let ul knw abt it 2mrw!

so got the information ?

 

[hela]

RIP everyone in the post ....come back the night before biology paper.... ....

is there any new thing on the practical exam thats coming for P31 ?

 

[Noor Ahmad]

Can anyone tell me how to do this question? Q2a (ii)
http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_w08_qp_32.pdf

 

[h4rriet]

Can anyone tell me how to do this question? Q2a (ii)
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w08_qp_32.pdf

Number of eyepiece graticule units: 8.75-1.50=7.25 EPG units. (You have to measure the width of the lumen.)
Now you can see on the second Fig. that 10 units of the stage micrometer are in line with 9 units on the EPG.
You've got all the information you need, now all you need to do is cross multiplication:
7.25 EPG units - x stage micrometer units
9 EPG units - 10 stage micrometer units
9x - 72.5
x - 8.1

1 unit on the stage micrometer - 0.1 mm
8.1 units - x mm
x - 0.1 x 8.1 = 0.81 mm.

 

[Noor Ahmad]

Number of eyepiece graticule units: 8.75-1.50=7.25 EPG units. (You have to measure the width of the lumen.)
Now you can see on the second Fig. that 10 units of the stage micrometer are in line with 9 units on the EPG.
You've got all the information you need, now all you need to do is cross multiplication:
7.25 EPG units - x stage micrometer units
9 EPG units - 10 stage micrometer units
9x - 72.5
x - 8.1

1 unit on the stage micrometer - 0.1 mm
8.1 units - x mm
x - 0.1 x 8.1 = 0.81 mm.

Thank you so much.
But what are these values written in the marking scheme? i dont really get those.From where did they get 28/29.

And when finding the value on the stage micrometer,why did you take it as 10 units,not 3mm?