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AS Biology P1 MCQs Preparation Thread

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AsSalamoAlaikum Wr Wb!

got another doubt in Q:22 [Ans.B]
Q:23 [can someone explain such types of graphs...really confusing... :confused:]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s03_qp_1.pdf
22) Pulmonary artery does carry oxygen but that doesn't mean that it has 0% oxygen. :) So ans is B.
23) Pressure in aorta is just going to increase at X which means that blood is just pumped i.e ventricle is contracting & semilunar valves are open. So ans is B.
 

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AsSalamoAlaikum Wr Wb!

I need help with Question 26, 30 ad 32 of Nov 2002 plz...

26 is A


32 is A
26) I don't get it myself. I need to revise this chapter ASAP. :p
30) It is stated in question that u have to determine about normal breathing. So simply multiply tidal volume * min of breathing. Ans is B
32) The most developed heart (healthy) would be which beats less often to provide the same amount of oxygen. So ans is A which has lower pulse rate. :)
 

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Babri JazakAllahu khairen for the help.....!!!! May Allah give u success in both worlds...
 
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13) Competitive ihibition so if more substrate then faster reaction as higher chance of substrate colliding with enzyme than inhibitor with enzyme.
21) Use concept of semi-conservative replication. So first generation would be 14,15 & 14,15. Since this is a hybrid it would be heavier than pure N14 but lighter than N15, hence at position Y. For 2nd generation do it again : 14,14 14,15 14,14 14,15. So half at X & half at Y. Ans is C
32)The data gives %age of people in an age group who smoke cigarettes NOT number of people. So ans is D.
 
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Option B states that mitosis plays a role in the growth of cell, that's not true. It plays a role in the replication of cells, and the growth of the ORGANISM. Not the cell. The cell grows during interphase, which is basically it's entire life cycle - mitosis.

You see how subtle change in wording are extremely important in rudimentary biology? :p
 
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I dont get why the ans is C. I think it's D cos all male bees should be genetically identical :(.
It has to be D ! Because 1 and 2 are inter-related. Mitosis produces genetically identical cells therefore both 1 and 2 are correct.
it is c! because meosis division is taking place and not mitosis since haploid no. is involved. and hence all male bees are :)
 
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AsSalamoAlaikum Wr Wb!

I need help with Question 26, 30 ad 32 of Nov 2002 plz...

26 is A


32 is A
In 26th question , When arterial pressure and blood flow decrease beyond a certain point, the perfusion of the brain becomes critically decreased (i.e., the blood supply is not sufficient) and there would be an increase in [CO2] which would cause a decrease in [O2] ... When such condition prevails , a rise in the the volume of blood being pumped by the heart would be noticed hence causing cause the greatest rise in cardiac output
 
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