AS BIOLOGY P-33

[raamish]

hey guys how will we test for fungal amylase if it is given. Plzz tell

 

[stella jazz]

atleast give me some credit mate...

i was wondering the same thing cuz initially u posted it but i hope u r a 100% sure cuz if food test doesnt come and something else does(serial dilution or whatever) than i am screwed...u r sure rite? i need motivation

 

[nightmaressana]

guys, what do they mean by first sign of colour change.. for example in reducing sugar test, the first sign is green??

Someone please answer this!
When they say you have to time for the colour change, do we have to time for the permanent colour change or the first sign of colour change? in food tests?

 

[afoo.666]

M/J/10/32 Q1 is about dicot root. Check it out. Amd lemme know how to draw it properly to gain 6 marks.

 

[afoo.666]

What about magnification part? Is it coming? If yes, then kindly explain how to find it.

 

[rose1700]

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_w12_qp_33.pdf

Does this paper resembles the guess

 

[stareaj]

hey guys how will we test for fungal amylase if it is given. Plzz tell

Biuret test
Take 2cm sol in a test tube
Add 2/1cm naoh
And dropwise 1% copper(2)sulphate
And if purple colour then it shows presence of prote
ein

 

[stareaj]

What about magnification part? Is it coming? If yes, then kindly explain how to find it.

Magnification is equall to drawing over actual
Sometimes examiner gives magnification and a diagram
So messure the length this lenght in in cm convert to micrometer and divide by magnification to find actual lenght

 

[falcon678]

i was wondering the same thing cuz initially u posted it but i hope u r a 100% sure cuz if food test doesnt come and something else does(serial dilution or whatever) than i am screwed...u r sure rite? i need motivation

i will be more screwed then u...

well umm yeah.. m very sure...

 

[falcon678]

Someone please answer this!
When they say you have to time for the colour change, do we have to time for the permanent colour change or the first sign of colour change? in food tests?

the first chnge is whn blue colour chnges frm blue to green....

 

[Sonysherpa]

biology P33
osmosis
sucrose,gulcose.starch detection

Could it be plasmolysis?

 

[Sonysherpa]

Does anyone know which year's question has Plasmolysis in P3?

 

[comrade]

i was wondering the same thing cuz initially u posted it but i hope u r a 100% sure cuz if food test doesnt come and something else does(serial dilution or whatever) than i am screwed...u r sure rite? i need motivation

For serial dilution do check P34 of May/June 2012. Last year. You never know what might come up. I suck at making dilutions and concentrations.

 

[raamish]

and is there a post where all the errors in different experiments is written. can somebdy plzz tell me

 

[Z.A.M]

Does anyone know which year's question has Plasmolysis in P3?

Oct Nov 2008 31

 

[Z.A.M]

Anyone over here giving 31 ?? Guysss???

 

[comrade]

Someone please answer this!
When they say you have to time for the colour change, do we have to time for the permanent colour change or the first sign of colour change? in food tests?

Benedict solution is blue in colour. If a reducing sugar is present, the solution will gradually turn through green, yellow and orange to brick red as the insoluble copper (I) sulfate forms a precipitate.

 

[Ahmad Zaeem]

Lol! Whaaaat???

yeah ... i am doing an internship in Services Hospital for 2 weaks .... ....first day i was scared to put a needle in anyone's arm or buttock .........but now its a piece of cake ....lol....you should try it ...its not a big deal !!!! ..Feel like an expert!!..

 

[Z.A.M]

I know the thread says P33 but is any one giving 31??

 

[Sonysherpa]

T

Oct Nov 2008 31

Thank you