biology practical

[dumb human]

guys,, no info about 31? :|
plz

i am doing 33....i gess 21 is same? or close but still you learn food test

 

[NadaTareq]

Any one encountered a past paper about yeast dilution??

 

[Wolfgangs]

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_w13_qp_31.pdf

How to do simple dilution with a specific percentage difference?

 

[yamaner]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w13_qp_31.pdf

How to do simple dilution with a specific percentage difference?

yea how do we do part B?

 

[Wolfgangs]

When they say for use to draw a low or high power diagram, we must use a eyepiece graticule to have a specific scale when drawing? Or we simply draw what we see in a neat way?

 

[ibrahimovic]

Lool...how was p33?

 

[ZaqZainab]

Lool...how was p33?

amazing

 

[joanna omar]

HOW ABT for 32 ?

 

[CrownSA]

Guys what was in paper 33, i have my p35 soon, any tips?

 

[white ash]

oh man!if only i had seen this before!:'(

HERE YO GO!I CAME TO KNOW ABOUT IT FROM MY FRIEND.

*Its like Yeast in gonna be there in both Question(1&2)--->(Serial dilution and Slide)

1) We are gonna have YEAST, to which you will add 1 drop Methyl-Blue, then check under Microscope, if cells are BLUE--->then the cells are DEAD, but if cells are YELLOW--->they are LIVING.

2)They may ask to state about:-
#MODIFICATION:-Use calorimeter(to find the end-point), Repeat more than once.
#RELIABLE RESULTS:-Repeat the experiment and calculate the Mean, Increase the range of Concentrations, Record the result in shorter intervals.
#ACCURACY:-Use Stopwatch, use Digital-Thermometer, use Calorimeter, use a temperature to control Water-bath.

3)Serial-Dilution of yeast okay...

 

[dumb human]

oh man!if only i had seen this before!:'(

Aww i am sorry =( i came to know about it like late night yesterday... hope you still get good grades =)

 

[CrownSA]

turns out we had food tests, but wasnt too hard

 

[Asad rehman]

HERE YO GO!I CAME TO KNOW ABOUT IT FROM MY FRIEND.

*Its like Yeast in gonna be there in both Question(1&2)--->(Serial dilution and Slide)

1) We are gonna have YEAST, to which you will add 1 drop Methyl-Blue, then check under Microscope, if cells are BLUE--->then the cells are DEAD, but if cells are YELLOW--->they are LIVING.

2)They may ask to state about:-
#MODIFICATION:-Use calorimeter(to find the end-point), Repeat more than once.
#RELIABLE RESULTS:-Repeat the experiment and calculate the Mean, Increase the range of Concentrations, Record the result in shorter intervals.
#ACCURACY:-Use Stopwatch, use Digital-Thermometer, use Calorimeter, use a temperature to control Water-bath.

3)Serial-Dilution of yeast okay...

There was no serial dilution in that nor any question about reliability of results or accuracy.

 

[dumb human]

There was no serial dilution in that nor any question about reliability of results or accuracy.

reliability came bro!!! yeah but no serial dilution though =P

 

[dumb human]

turns out we had food tests, but wasnt too hard

FOOD TEST? which paper??32?

 

[joanna omar]

what is gonna be there for 32 any idea ?

 

[white ash]

Aww i am sorry =( i came to know about it like late night yesterday... hope you still get good grades =)

thanks anyway!i pray the same for you!

 

[dumb human]

thanks anyway!i pray the same for you!

Thank you =) An d u r welcome!!

 

[Wolfgangs]

Guys, if anyone did paper 31. For the Q2, was there any question that involves using eyepiece graticule? Or we simply draw big diagrams? And the lumen, it was the empty space in the middle right?

 

[dumb human]

i d

Guys, if anyone did paper 31. For the Q2, was there any question that involves using eyepiece graticule? Or we simply draw big diagrams? And the lumen, it was the empty space in the middle right?

i did 33...