AS Biology P1 MCQs Preparation Thread

[XPFMember]

Aoa wr wb!
umm need help ..
JazakAllahu khairen.... @everyone who helped

 

[raamish]

got two very imp qs : tissue fluid doesnt contain proteins right? i saw in a Qs answer it did. i dont have the qs though. and how to calculate net primary productivity i dont know how please help quickly
http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w07_qp_1.pdf
qs 40 help

 

[malik234]

may/june 2010/11
mcq no. 3
can anyone plz help, hw is the calculatoin done ?

 

[Soldier313]

Aoa wr wb!
umm need help ..
JazakAllahu khairen.... @everyone who helped

View attachment 12842

cell 3 is xylem and cell 1 is phloem, since xylem transports water it definitely has a less negative water potential than phloem

 

[Soldier313]

QRS represents ventricular systole, so P and T must be ventricular diastole

how did u know QRS is ventricular systole?
and what exactly does recovery of ventricle walls mean?

 

[XPFMember]

What is pressure potential??

Ashique All the other 3 options are wrong...cuz what they mentioned...opposite is what happens...from the info they gvae...conc. in cells is 0.35 and outside is 0.1 ....so water potential is higher outside than inside...
hence water will move into the cells

 

[Soldier313]

may/june 2010/11
mcq no. 3
can anyone plz help, hw is the calculatoin done ?

look they have said that 1 unit on the stage micrometer is 0.1 mm
and the diameter if u see is 2.5 mm
u use the formula π r ^2
so radius is 1.25mm
which in micrometers would be 125 micrometers
hence π x 125 x 125

 

[malik234]

got two very imp qs : tissue fluid doesnt contain proteins right? i saw in a Qs answer it did. i dont have the qs though. and how to calculate net primary productivity i dont know how please help quickly
http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w07_qp_1.pdf
qs 40 help[/q

 

[malik234]

got two very imp qs : tissue fluid doesnt contain proteins right? i saw in a Qs answer it did. i dont have the qs though. and how to calculate net primary productivity i dont know how please help quickly
http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w07_qp_1.pdf
qs 40 help

in this mcq u see that the energy that the the primary consumers use after losses is 0.75% (herbivores) whereas the total energy transfered by the producers is 1.75% so net productivity is the ratio b/w these two.

 

[malik234]

look they have said that 1 unit on the stage micrometer is 0.1 mm
and the diameter if u see is 2.5 mm
u use the formula π r ^2
so radius is 1.25mm
which in micrometers would be 125 micrometers
hence π x 125 x 125

how is the diameter 2.5 mm ?

 

[narutogirl]

http://www.xtremepapers.com/papers/...nd AS Level/Biology (9700)/9700_w10_qp_13.pdf
I want to understand question "34"..why is it "B"? ^_^

 

[XPFMember]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w10_qp_13.pdf
I want to understand question "34"..why is it "B"? ^_^

Aoa wr wb!

 

[narutogirl]

Aoa wr wb!

View attachment 12843

Thank you, ^__^
I have another question in m/j 2008 question number "27"...why not high? Also what is the difference between solute potential and solute concentration..^_^"
http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_s08_qp_1.pdf

 

[Nibz]

how did u know QRS is ventricular systole?
and what exactly does recovery of ventricle walls mean?

Because it's a fact.
P is atrial systole.
QRS is ventricular systole.
T is the start of ventricular diastole.
Learn these points about ECG.

 

[malik234]

look they have said that 1 unit on the stage micrometer is 0.1 mm
and the diameter if u see is 2.5 mm
u use the formula π r ^2
so radius is 1.25mm
which in micrometers would be 125 micrometers
hence π x 125 x 125

thanks alot i got it !

 

[XPFMember]

Because it's a fact.
P is atrial systole.
QRS is ventricular systole.
T is the start of ventricular diastole.
Learn these points about ECG.

...i never get this thing...these graphs...very confusing :/

 

[malik234]

Each division in the stage micrometer is 0.1 mm. So from the diagram we can see that 40 division in the eye piece graticule is equal to 1 division in the stage micrometer. So 1 division in the eye piece graticule= 0.1/40= 0.0025mm. Each small division in the eyepiece graticule is 0.0025 mm.
Then find the diameter of the field- there are 100 division in the eye piece graticule, so 0.0025*100=0.25 mm= 250 micrometer.
They asked for the area, and we know the formula to calculate the area of a circle is pi*r^2 (pi r square or pi*r*r)
The find the radius of the field which is 250/2= 125
so pi*125*125= 4*10^4
Hence answer is C

yeah thanks alot !

 

[Capricedcapri]

Plz sum1 help me with mcQ 13 of may June 2010 variant 12

 

[stella123]

anybody??????? who cud help me in ques 39 of oct/nov/07

 

[Nibz]

...i never get this thing...these graphs...very confusing :/

There are only two graphs that could come.
One is this ECG one. And the other where they ask us to identify when the atrio-ventricular and semi-lunar valves close and open.


P is the atrial systole.
QRS is ventricular systole.
T is the start of ventricular diastole.
That's all you need to know!

2.


Opens Closes
Closes Opens. Rote-learn it for short-time's sake.