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AS Biology P1 MCQs Preparation Thread

Peter Check

Peter Check

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00tanveer said:
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It's A bro.... Anyone else wanna give a try??
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Yeah its A. Basically the question is asking If you are not allowed to use a fertilizer, in what other way can you increase the field's fertility. B is plausible because beans are leguminous plants, so whatever nitrates the wheat takes from the plant, the beans put it back(nitrogen fixation/root nodules). And C and D are simple as the farmer is literally putting back the nitrates with their hands! SO A is the answer, as even the cereal crop will take up further nitrates from the soil, reducing its fertility even more.
 
R

raamish

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Soulgamer said:
They are asking about single-bound structures as in organelles inside the cell. RBC's don't have much of the protoplasm (absence of nucleus) etc
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ok so why not smooth muscle cell, and ciliated cell not correct ?
 
JulyMei

JulyMei

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rogue94 said:
0 kPa is the water potential of pure water, whereas water in xylem contains dissolved mineral ions so it has a lower (less than o) water potential. :)
The question asks about salty water which is unsuitable for growth. Water moves from the xylem to the soil water (which is why it is unsuitable for growth, since water is being lost from the roots.) As water moves from less negative to more negative water potential, the correct option is D (from -700 to -1800). Options A and C are easily eliminated since both xylem and soil water can't have a water potential of o kPa (only pure water does) whereas option B indicates movement of water from soil water to xylem which is the opposite of what the question asks.
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Ok. Got it! Thanks a lot! :)
 
JulyMei

JulyMei

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Can i know why can't the answer be hydrogen bond?
 

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JulyMei

JulyMei

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Soulgamer said:
Increasing unsaturated hydrocarbons increase fluidity i.e. Unsaturated tails fit in more loosely. Hence the answer is C i guess?
Hydrogen bonds have no use here.
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yes. the answer is C.
hmm.. stabalise and fluidity is different?
stabalise is with h-bonds? and fluidity base on the unsaturated tails?
 
X

xyz!

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JulyMei said:
yes. the answer is C.
hmm.. stabalise and fluidity is different?
stabalise is with h-bonds? and fluidity base on the unsaturated tails?
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in layman's language, fluidity basically refers to the viscosity of the membrane while stability is the ability of the membrane to be stable in watery surroundings...hope u got it! :p
 
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