Biology paper 52

[aka abdul]

Crap.. iodine is used to test the presence of starch x_x

So if all the starch is hydrolyzsed, the solution should remain brown?

So I messed that one up then :')

well its not necessary that all the starch is broken down in the given time like in experiment in which some area remained blue black

 

[anonymous1122]

Area stained brown

What were factors to be standardised in q2?
And explanation of table of 3 marks?

 

[samantha liyanage]

What were factors to be standardised in q2?
And explanation of table of 3 marks?

For that I wrote these stuff should be stardardized:

Make sure none of the females drank any coffee or any substance containing caffeine because this speeds up nerve impulse transmission.
All the females should not be drug-users (drugs also affect the speed of transmission)
The distance between the probes should be same for all women.
The females should all be of approximately same mass, but I don't think this one is right :/

 

[anonymous1122]

I wrote caffeine + drug intake+ weight
Weight and mass are same and my brother who is a doctor says weight was correct so mass too would be correct

 

[Princess Raven]

I wrote
None of females should have any nerve disorder
Temperature (it affects conductance)
None of the females should be under stress or pregnant
And distance between probes should be kept constant
I guess u could also say the various location which skin patch is placed should be constant for all females being tested

 

[aka abdul]

what about the age groups?

 

[aka abdul]

is it correct to mention that experiment is conducted at different females at the same time of day

 

[anonymous1122]

what about the age groups?

I wrote 2nd and last group. The one with max difference

 

[Princess Raven]

what about the age groups?

I wrote first and last group as
Mean value and sm errors do not overlap so difference is significant

 

[Debonny1]

Didn't it have to be consecutive age groups :/

 

[Debonny1]

What did u guys write for the anomalies one?

 

[Debonny1]

in q1
we're supposed to find the area of the brown area.
by keeping the enzyme solution in the well to find out the unknown concentration using c1v1=c2v2

How did u use c1v1 = c2v2?

 

[thementor]

How t_test? I wrote chi square test =/

Well not sure now... Some people are saying it's t test... I will ask my teacher...

H


Isn't t test used when values are continuous =/ or I think you are right

It was the t-test because the data had a normal distribution.

 

[thementor]

I wrote to prepare concentrations and compare the area stained with the area stained by the extract
Is that fine? :/

I asked my teacher about that. She said it's perfectly fine. As long as you gave enough detail on it.

 

[thementor]

Is comparison method correct? To prepare concentrations of amylase and calculate area. The area of concentration prepared corresponding to area stained by fungal extract is the required concentration?

yes it is correct

 

[Debonny1]

For the dealing with the anomalies question, could we write draw a graph and tally the readings from it
when

 

[thementor]

I wrote
None of females should have any nerve disorder
Temperature (it affects conductance)
None of the females should be under stress or pregnant
And distance between probes should be kept constant
I guess u could also say the various location which skin patch is placed should be constant for all females being tested

you can also write the intensity of the impulse should be the same

 

[thementor]

I wrote
None of females should have any nerve disorder
Temperature (it affects conductance)
None of the females should be under stress or pregnant
And distance between probes should be kept constant
I guess u could also say the various location which skin patch is placed should be constant for all females being tested

which anomalies did you circle?

 

[Jacqulene Preethi]

I wrote about different intensities of the blue-black color since not all the starch is hydrolyzed in one, and in the other all of it was hydrolyzed.

Then the intensity of the colour was measured using a colorimeter and compared.

Also bio-sensors and dipsticks could be used.. right?

I think we had to write about the Benedict's reagent. Since 1, 6- glycosidic bonds are present only in reducing sugars. Not sure though :/

 

[thementor]

I think we had to write about the Benedict's reagent. Since 1, 6- glycosidic bonds are present only in reducing sugars. Not sure though :/

I wrote the same