NTSE stage 1 and stage 2. Giving details about cutoff, answer key, result and all updates by NCERT.
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What will be the cutoff for this year KVPY SA? Resonance predicts it to be around 59+-3, they must be joking ryt? or is is it the cutoff for being in AIR 50? LOL
Result expected only in mid December. Interview is conducted in Jan/Feb. Result in March. Based on qp and feedback so far, I am thinking it should be ~45.
Please tell me where i am wrong regarding question no 80
In question no 80 since the line is to be drawn from exterior of the animal cell, it crosses the plasma membrane which has single bilayer. Further it crosses mitochondria "twice"(one while entering and one while leaving it) which has two membranes ie'two bilayers'. Lastly it crosses the nuclear membrane "once" which has two bilayer. So in total the minimum no of bilayers crossed by the line is 7. This answer does not corresponds to any of the given options.
I am glad you too found out the answer to be 7 for Qn 80 of KVPY SA 2015. I am also sure it cannot be 6 and must be atleast 7.
By Exterior of the cell, they mean outside the cell only. Starting from the exterior of the cell, there are 3 things that the line will cross before it reaches the centre of nucleus – 1) Cell membrane, 2) Mitochondria and 3) Nuclear membrane. Cell membrane is made of 1 phospholipid bilayer.
Mitochondria has 2 membranes - outer and inner (each one is a phospholipid bilayer) and the line will cross Mitochondria across & touch both the membranes on both sides. This means the line will touch outer & inner membranes of Mitochondria twice. This works out to 4 bilayers.
Finally, the line will cross Nuclear membrane which again has 2 membranes (inner and outer - both are lipid bilayers). So line will cross 2 bilayers here.
So total no. of bilayers that the line will cross comes to 1 + 2 + 2 + 2 = 7. But 7 is not given in the options.
May be there is one more and that can make it 8.
So in my view, they have to award Bonus marks for all for this Question.
Exterior means exterior. And the very basic defination of cell is protoplasm bounded by a membrane. How can one not treat the word "exterior" as exterior and anything else.
For Qn 78 of KVPY 2015 SA (Rabbit population), Answer has to be either C or D only.
In this question, food supply is mentioned as plenty. Plenty means “large quantity” but “not infinite”. And Island, by definition, is a restricted finite space.
In a finite space (like an island), no population can keep growing exponentially for long. If it does, then sooner or later it must encounter shortages (either food or space or both) and the population will decrease to extinction. So Option D looks more close.
There can be many logic for this given question but one thing for sure is why everyone is considering the given island as a very small one. This description of the island being small is nowhere given. Even Australia is also an island. The only purpose for using it is for defining an "isolated" place away from external factors and also that they cannot mate with external population due to "geographic isolation" (remember this term from class 10 biology) And mind due even if the island would be as small as an average sized city then it could support at least billion population since the requirement of the rabbits is very less. Also no one has consider the time period of the graph. Since it is not mentioned how can we be so sure that something would definately happen. Also even if you consider the time period the rabbit population may not even survive till that because of very less genetic pool and they all might die. This is actually happening in case of cheetah and we might see them going extinct in our life time only.
Normally, for studying the population growth effects of different species, Scientists perform experiments in a controlled environment. They perform it in labs or conduct it outside in a small geographic area like small islands. Obviously, they don’t consider Australia-sized or city-sized islands for this.
There are some case studies available for such experiments. Refer to Fig. 9.1 of this paper : http://www.zo.utexas.edu/courses/Thoc/PopGrowth.html. See the graph given there and compare it with Option D.
This was not an experiment and there cannot be another "Mendel" who has that much of patience. This was only a visualization of what could happen. You can draw an analogy between bacteria culture in incubator for this kind of visualisation
Please upload the question paper of kvpy sa as a majority of students who applied in the online mode do not have it and is necessary
ReplyDeleteWhat is the expected cut off for 2015 KVPY SA ? It seems paper difficulty level was more or less similar to last year. Last year cutoff was 43 ...
ReplyDeleteCut off to touch 48
ReplyDeleteCut off to touch 48
ReplyDeleteWhat will be the cutoff for this year KVPY SA? Resonance predicts it to be around 59+-3, they must be joking ryt? or is is it the cutoff for being in AIR 50? LOL
ReplyDeleteI totally agree with you. They always tell wrong cutoff marks. What do you predict??
ReplyDeleteWhen are we going to get the answer keys from IISc ?
ReplyDeleteofficial answer key out. few answers different from answer keys given by resonance, fiitjee and allen
ReplyDeleteyes .... Q78 is most ridiculous question ... everyone is giving a different answer.
ReplyDeleteq80 - also has many versions ....
What will be the cutoff now? (SA stream)
ReplyDeletewhen is the result of stage - I declared? What are the expected dates for interview? when is the final result declared (Sa + interview)?
ReplyDeleteAll the leading coaching institutes gave the same answer but different from the kvpy answer key. So will the kvpy answer key will be modified or not
ReplyDeleteResult expected only in mid December. Interview is conducted in Jan/Feb. Result in March. Based on qp and feedback so far, I am thinking it should be ~45.
ReplyDeletePlease check the ans of question no 17,77,78,80. If error found then please inform the concerned authorities.
ReplyDeleteQ77 b
ReplyDeleteQ 78 a
If not please share ur answer and view.
Yes, in my opinion these should be but different answers are given in kvpy official answer key.
ReplyDelete78 can not be A. due to space limitation population can not keep increasing.
ReplyDelete80 D is correct.
q17 KVPY key is wrong.
ReplyDeletePlease tell me where i am wrong regarding question no 80
ReplyDeleteIn question no 80 since the line is to be drawn from exterior of the animal cell, it crosses the plasma membrane which has single bilayer. Further it crosses mitochondria "twice"(one while entering and one while leaving it) which has two membranes ie'two bilayers'. Lastly it crosses the nuclear membrane "once" which has two bilayer. So in total the minimum no of bilayers crossed by the line is 7. This answer does not corresponds to any of the given options.
I am glad you too found out the answer to be 7 for Qn 80 of KVPY SA 2015. I am also sure it cannot be 6 and must be atleast 7.
DeleteBy Exterior of the cell, they mean outside the cell only. Starting from the exterior of the cell, there are 3 things that the line will cross before it reaches the centre of nucleus – 1) Cell membrane, 2) Mitochondria and 3) Nuclear membrane.
Cell membrane is made of 1 phospholipid bilayer.
Mitochondria has 2 membranes - outer and inner (each one is a phospholipid bilayer) and the line will cross Mitochondria across & touch both the membranes on both sides. This means the line will touch outer & inner membranes of Mitochondria twice. This works out to 4 bilayers.
Finally, the line will cross Nuclear membrane which again has 2 membranes (inner and outer - both are lipid bilayers). So line will cross 2 bilayers here.
So total no. of bilayers that the line will cross comes to 1 + 2 + 2 + 2 = 7. But 7 is not given in the options.
May be there is one more and that can make it 8.
So in my view, they have to award Bonus marks for all for this Question.
I don't think they treat "exterior" menas from outside of cells. They are just counting mitochondria and cells bilayers which is 6.
ReplyDeleteExterior means exterior. And the very basic defination of cell is protoplasm bounded by a membrane. How can one not treat the word "exterior" as exterior and anything else.
DeleteThis comment has been removed by the author.
ReplyDeleteThis comment has been removed by the author.
ReplyDeleteFor Qn 78 of KVPY 2015 SA (Rabbit population), Answer has to be either C or D only.
ReplyDeleteIn this question, food supply is mentioned as plenty. Plenty means “large quantity” but “not infinite”. And Island, by definition, is a restricted finite space.
In a finite space (like an island), no population can keep growing exponentially for long. If it does, then sooner or later it must encounter shortages (either food or space or both) and the population will decrease to extinction. So Option D looks more close.
There can be many logic for this given question but one thing for sure is why everyone is considering the given island as a very small one. This description of the island being small is nowhere given. Even Australia is also an island. The only purpose for using it is for defining an "isolated" place away from external factors and also that they cannot mate with external population due to "geographic isolation" (remember this term from class 10 biology) And mind due even if the island would be as small as an average sized city then it could support at least billion population since the requirement of the rabbits is very less. Also no one has consider the time period of the graph. Since it is not mentioned how can we be so sure that something would definately happen. Also even if you consider the time period the rabbit population may not even survive till that because of very less genetic pool and they all might die. This is actually happening in case of cheetah and we might see them going extinct in our life time only.
DeleteNormally, for studying the population growth effects of different species, Scientists perform experiments in a controlled environment. They perform it in labs or conduct it outside in a small geographic area like small islands. Obviously, they don’t consider Australia-sized or city-sized islands for this.
DeleteThere are some case studies available for such experiments. Refer to Fig. 9.1 of this paper : http://www.zo.utexas.edu/courses/Thoc/PopGrowth.html. See the graph given there and compare it with Option D.
Yes D seems most accurate but the time period must be taken into consideration
DeleteHow much are you scoring, Guhan?
Delete@ Krishna AR : I am getting 64.75 as per the official key. How about u ?
DeleteWow!!! That's massive.
DeleteI am scoring really bad..only around 50-early fifties...
This was not an experiment and there cannot be another "Mendel" who has that much of patience. This was only a visualization of what could happen.
ReplyDeleteYou can draw an analogy between bacteria culture in incubator for this kind of visualisation
I Am Getting 70 Marks In KVPY SA Stream according to official key and 75 from fiitjee key. what is the cutoff?
ReplyDeleteThis comment has been removed by the author.
ReplyDeleteFinal keys uploaded today ... only changes in q17 ( now C is correct option ) and q70 ( 2 marks to all ).
ReplyDeleteYeah i got only 70 from official key! :(
ReplyDeleteThis comment has been removed by the author.
ReplyDeletewhen will be the results declared for KVPY-2015. When the results for KVPY-2014 were declared.
ReplyDeleteAny updates
ReplyDeletenope
Deleteresult declared...
ReplyDeletecutoff 50 for SA
http://www.kvpy.iisc.ernet.in/main/2015-aptitudetestresults.htm