Biology/Physics ATP Preparation Thread

[CaptainDanger]

Don't you get the answers of marking schemes? Or examiner reports?

 

[Muhammad Talha]

Don't you get the answers of marking schemes? Or examiner reports?

I m nt able to undersatnd them... :%)

 

[sksuriza]

ok let me help u wait

 

[sksuriza]

in part a u have to make drwing quite easy u cn do tht.....
u can measure either ur drawing or the pic measurement
for description u jxt have to tell wt u cn c n understand
like for it it is pale green.. small light green leaves... root system developed... the leaves are chlorotic ie a yellow substance is deposited... mayb defeciency of magnesium ions
for b it is bark green wd dark green lkeaves... root system well developed
for c.. it had not germinated.... the seed has been frozen to 4 c ... ...

 

[sksuriza]

in B part simply describe
difference in a n b
in sunlight 'b'' can photosynthesize more as it is more green...as more chlorophyll... can trap more light energy... in contrast to light green 'a'

B n C
both light intensity n temp r imp.....in C the enzyme activity is zero due to low temp ot is inactive...... alothough placed in light temp is limiting factor... so no growth or germination in c as compared to B whch gets both conditions germinates best

 

[Muhammad Talha]

Thanx sksuriza...

 

[adnanj]

Bio Atp Questions....
Plz answer these questions...

In Biuret test, is same quantity of Enzyme solution and the sample same???
What is the difference between Dry Mass and Fresh Mass and their constituents???
Can we suggest repeating the xperiment for accuracy???
What r dessicators and y r they used???
http://www.xtremepapers.me/CIE/Cambridg ... _qp_42.pdf Q4 whole

Thanks in advance!

 

[intelnehalem]

Bio Atp Questions....
Plz answer these questions...

In Biuret test, is same quantity of Enzyme solution and the sample same???
What is the difference between Dry Mass and Fresh Mass and their constituents???
Can we suggest repeating the xperiment for accuracy???
What r dessicators and y r they used???
http://www.xtremepapers.me/CIE/Cambridg ... _qp_42.pdf Q4 whole

Thanks in advance!

The student draws around the block to get to know where exactly the light ray hits the block of glass and also If the block is accidentally moved, since the outline is there we can easily restore its original position!
The Pins P3 and P4 are placed in line with the images of P1 and P2
Ray 2 passes through the block without any change of direction since it is perpendicular to the glass block (angle of incidence = 0 )
Do you need me to draw the ray diagram too?

 

[intelnehalem]

Bio Atp Questions....
Plz answer these questions...

In Biuret test, is same quantity of Enzyme solution and the sample same???
What is the difference between Dry Mass and Fresh Mass and their constituents???
Can we suggest repeating the xperiment for accuracy???
What r dessicators and y r they used???
http://www.xtremepapers.me/CIE/Cambridg ... _qp_42.pdf Q4 whole

Thanks in advance!

To answer your Bio questions,
What do you mean by sample? Let me know so that I can answer your question!
Dry mass- mass of organic matter without any water, fresh mass is the mass of a organism including the water content
Yes, repeating the experiment should be suggested!
Dessicators are used to preserve mositure-sensitive items! It prevents water from entering a specified substance. Useful in measuring dry mass, etc

 

[nafeekhan]

Ok this is embarrasing, I accidentally opened a Bio ATP topic without checking if there were any. I deleted it.

So I am going to post my queries here

My biology paper 6 (ATP) is day after tomorrow on the 18th.
My preparation is good, as in I got all the chapters covered quite throroughly.

But the question pattern is bothering me.
Question no.3 in the May/June 2009 paper in which they give you diagrams of three specimen seeds that have been germinating for 4 days,

you are required to draw a diagram for each. (labelled obviously)

However, there is another column which asks for "Maximum Length". I have no clue what they are asking for. Is it the maximum length of the the whole seed before or after 4 days?
Or is it the maximum length of my drawing?

I need urgent help.

these questions that require you to draw something, bothers me.
because I don't know how to take the measurements.I have no scheduled classes before exam.

normally teachers here are not much knowledge about ATP and cambridge is relatively new to Bangladesh.

 

[Dissent]

You have to draw them in the space provided, and then rule a line from the seed to the growing leaves, noting down the length using your ruler. Remember that they are asking for the entire length of the specimen.

Hope it helps.

 

[adnanj]

Bio Atp Questions....
Plz answer these questions...

In Biuret test, is same quantity of Enzyme solution and the sample same???
What is the difference between Dry Mass and Fresh Mass and their constituents???
Can we suggest repeating the xperiment for accuracy???
What r dessicators and y r they used???
http://www.xtremepapers.me/CIE/Cambridg ... _qp_42.pdf Q4 whole

Thanks in advance!

The student draws around the block to get to know where exactly the light ray hits the block of glass and also If the block is accidentally moved, since the outline is there we can easily restore its original position!
The Pins P3 and P4 are placed in line with the images of P1 and P2
Ray 2 passes through the block without any change of direction since it is perpendicular to the glass block (angle of incidence = 0 )
Do you need me to draw the ray diagram too?

ray diagram needed tooo :sorry:

 

[adnanj]

Bio Atp Questions....
Plz answer these questions...

In Biuret test, is same quantity of Enzyme solution and the sample same???
What is the difference between Dry Mass and Fresh Mass and their constituents???
Can we suggest repeating the xperiment for accuracy???
What r dessicators and y r they used???
http://www.xtremepapers.me/CIE/Cambridg ... _qp_42.pdf Q4 whole

Thanks in advance!

To answer your Bio questions,
What do you mean by sample? Let me know so that I can answer your question!
Dry mass- mass of organic matter without any water, fresh mass is the mass of a organism including the water content
Yes, repeating the experiment should be suggested!
Dessicators are used to preserve mositure-sensitive items! It prevents water from entering a specified substance. Useful in measuring dry mass, etc

If its 2cm3 of Egg Albumin, so do we need to take 2 cm3 of pepsin?? and then 2cm3 of Biuret solution for testing????
ANd further more how does dry and fresh masses vary when the seed germinates???

 

[Dissent]

Bio Atp Questions....
Plz answer these questions...

In Biuret test, is same quantity of Enzyme solution and the sample same???
What is the difference between Dry Mass and Fresh Mass and their constituents???
Can we suggest repeating the xperiment for accuracy???
What r dessicators and y r they used???
http://www.xtremepapers.me/CIE/Cambridg ... _qp_42.pdf Q4 whole

Thanks in advance!

To answer your Bio questions,
What do you mean by sample? Let me know so that I can answer your question!
Dry mass- mass of organic matter without any water, fresh mass is the mass of a organism including the water content
Yes, repeating the experiment should be suggested!
Dessicators are used to preserve mositure-sensitive items! It prevents water from entering a specified substance. Useful in measuring dry mass, etc

If its 2cm3 of Egg Albumin, so do we need to take 2 cm3 of pepsin?? and then 2cm3 of Biuret solution for testing????
ANd further more how does dry and fresh masses vary when the seed germinates???

Dry mass decreases as the seed germinates, since it is using up its food reserves (no photosynthesis yet). Not sure about fresh mass though. The seed does take up a lot of water in the germination process, so I think it should rise.

 

[abcde]

Yes, the fresh mass increases during germination!

 

[Newbie]

O'LEVEL ATP AND THEORY TIPS FORM EXAMINER


http://adf.ly/1XRZ3

 

[abcde]

I have a small query: Is shading allowed in drawings? E.g. if we have to draw a variegated leaf, should we shade to distinguish between the chlorophyll containing and non-chlorophyll containing regions? Or simply label it?

 

[Nibz]

How would you tell the examiners that the parts you shaded are the chlorophyll containing regions? Using a Key?
I suggest you better label them rather than shading!

P.S 'Avoid shading' is the comment I've usually seen in the examiner reports!

 

[adnanj]

more questions to go.. plz help

What is a cultural solution??
What is discernible???? ( saw in the ms )
Should the magnification match the ms??? mine is different.. it depends on the drawing na????

http://www.xtremepapers.me/CIE/Cambridg ... 2_qp_6.pdf
1d and 3a (ii)
http://www.xtremepapers.me/CIE/Cambridg ... 1_qp_6.pdf
2c

 

[zain786]

fresh mass is the mass including water and dry mass is the mass of the object(in this case seed) without water

so as seed germinates the dry mass decrases and fresh mass increases