A level Biology: Post your doubts here!

[shafayat]

How was 42 please. Is it difficult

very difficult! threshold must be low

 

[irtaza ali]

Yeah definately

 

[saaara]

does anyone know how to do the serial dilution for example how can we dilute 0.6 molar to zero? please answer me guys asap

 

[Merjema96]

does anyone know how to do the serial dilution for example how can we dilute 0.6 molar to zero? please answer me guys asap

serial dilution- series of solutions in which each one has a concentration that is one tenth(or half) of the previous one so from 0,6 mol/dm3 you can make 0,06, 0,006 and so on OR 0,3 0,15 etc.
you'll get 0,06 by mixing 1cm3 of 0,6+ 9cm3 of H2O
you'll get 0,3 by mixing 5cm3 of 0,6 + 5 cm3 of H2O

 

[Tulaib]

anyone with any guess about p33?

 

[MissBellum]

How was 42 paper biology
Is it difficult

i found it very lengthy and some of it was from AS but overall it was a good paper, not great... just good.

 

[happyperson]

Any guesses for p 34 biology. Please share!

 

[redd]

Why are there two parts of (V) in this question, this is w10, paper 35 Q1. i cant figure out any relation of this part with the question. Like from where did the enzyme come.

 

[waleed302]

If someone could give a list of the required plan diagrams( i.e. cross section of stem etc.) we should be able to draw for Biology paper 3 it would be greatly appreciated

 

[MYLORD]

If someone could give a list of the required plan diagrams( i.e. cross section of stem etc.) we should be able to draw for Biology paper 3 it would be greatly appreciated

Hey guys
I had a doubt if some1 would help it would be a great help !!
In the microscopy part when they ask u to contrast between 2 figures what should be the main things that should contrasted on ?
like arrangement of vascular bundle . Pls add to this list bcuz i get confused here .

 

[Karim Nabil]

Credit origin 0.50/1.00 if labelled
what does that mean ?

 

[Snowysangel]

Credit origin 0.50/1.00 if labelled
what does that mean ?

What year?

 

[Karim Nabil]

What year?

it is a constant phrase in marking graphs....

 

[DeViL gURl B)]

↑
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w12_qp_33.pdf

Please anyone explain me the calibration part! In DETAIL!
Thank you


HEEELLLPP!!!!

 

[Snowysangel]

it is a constant phrase in marking graphs....

I'm guessing it means u can take a false origin if your scale doesn't fit..

 

[DeViL gURl B)]

↑
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w12_qp_33.pdf

Please anyone explain me the calibration part! In DETAIL!
Thank you


HEEELLLPP!!!!

ANYYYONEEEE?????

 

[Karim Nabil]

I'm guessing it means u can take a false origin if your scale doesn't fit..

i have asked my teacher, it means that if you write 0.5 or 1 at origin instead of zero you still get the mark !
but anyways, thanks for you help

 

[Asad rehman]

You should differentiate the 2 diagrams on the basis of their size,shape,no. of layers there are and organelles which are in AS syllabus.
Mostly diagrams of leaf structure(label vascular bundle is also asked) dicot root and stem and detailed diagram of Xylem vessel may be asked,But in recent 2014 9700 p 33 examiner had given the diagram and asked to make plan diagram of this and in Q2 he asked to make slides of yeast and observe them under microscope to answer proceeding questions.
Hope this will help and pray for my good grades.

 

[redd]

ANYYYONEEEE?????

okay i'm posting a picture for the working in a while then i can explain u with that

 

[redd]

↑
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w12_qp_33.pdf

Please anyone explain me the calibration part! In DETAIL!
Thank you


HEEELLLPP!!!!

Refer the working first, they have given us keh 1 micrometer div is 0.01mm and look i can see that 10 micrometer div(bigger ones) equals to 42 eye piece div(smaller ones), so i'll work out that what is the length of 10 micrometer div. and the length is equal to 42 eyepiece div, so for one eyepiece div, i haveto divide the length with 42 and for step 2, we need to change it to micrometers as our anwer in step 1 is in mm. hope u get that