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  1. S

    Mathematics: Post your doubts here!

    If you have cos^2, sin^2...you can't integrate them directly..so at first you have to conver them to integrate
  2. S

    A level Biology: Post your doubts here!

    And according to our book, lower solute potential means high concentration of solutes....so the sign gets more negative and water potential decreases.........so, yes this is now pretty confusing.......
  3. S

    A level Biology: Post your doubts here!

    Well, thank you very much for that information, but according to our Cambridge's course book , the lower the solute potential.(solute's potential not concentration) the ,lower the water potential....and this seem's quite confusing.........
  4. S

    Yes

    Yes
    • sumeru
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  5. S

    Mathematics: Post your doubts here!

    cos4a=1-2sin^2(2a) 2sin^2(2a)=1-cos4a sin^2(2a)=(1-cos4a)/2 Now integrate it.......
  6. S

    Mathematics: Post your doubts here!

    I will attatch the solved one for that vector question after a while...so don't worry
  7. S

    Mathematics: Post your doubts here!

    Since the line lies in the plane, the product of direction of line and the plane's normal must be zero.....so, you'll get one equation from this...and similarly, the points (4,2,-1) lies in the plane...so they must satisfy the equation of the plane....put these values in x,y,z you will get...
  8. S

    Mathematics: Post your doubts here!

  9. S

    A level Biology: Post your doubts here!

    Yes, pure water has high water potential and higher solute potential...which bio book do you use?.....if you use the Cambridge's one, look at it........ln it, it has clearly written that, a solution with more solutes has lower solute potential, and a solution with less solutes has higher solute...
  10. S

    A level Biology: Post your doubts here!

    You actually are now making me confused.....high solute means low water potential.....but in terms of potential, pure water will have the highest solute potential......
  11. S

    A level Biology: Post your doubts here!

    Ahh...you are really confusing me........a highly concentrated solution has lowest solute potential, which means that it has more solute molecules and less water molecules.....that's why concentrated solutions are higly negative...
  12. S

    Mathematics: Post your doubts here!

    Here it is...
  13. S

    A level Biology: Post your doubts here!

    Don't get confused because of the words......Low solute potential means more negative.......and more the negative low the water potential..thus, this means that low solute potantial means more solute molecules and hence, lower the water potential...
  14. S

    A level Biology: Post your doubts here!

    june 8 q.27...C....First of all remove those options which contain PRESENT in lignification of cell wall....now low solute potential means very negative water potential, that's why the water flows into the cells, during loading of sucrose. Nov 8 Q.4 B.....the magnification is given, so...
  15. S

    A level Biology: Post your doubts here!

    Just remember that when a peptide bond is formed one amino acid looses a carbo-oxyl group and the other looses a hydrogen atom from amine group so.........if there is RCOOH+H2NR.....then after loosing OH and H it will be...RC-O-N-H
  16. S

    A level Biology: Post your doubts here!

    1 micrometer=1000 nm s0, 0.2 micrometer=2oonm But the resolution is only 220nm, so a object of size 200nm will not be visible because the microscope can't resolve it....
  17. S

    A level Biology: Post your doubts here!

    Nov 4 Q.25 is D...well i can't tell you specific reasons for D but i can tell you why A B C might be incorrect if you want. June 5.... Q.11 is D...Because A is incorrect alpha helix is a secondary structure and at ph 2, it has secondary structure.....B is incorrect because it only has secondry...
  18. S

    A level Biology: Post your doubts here!

    June 4 Q.7 is C....for this you have a formula which is N^r.....where N is the no of amino acids....and r is no of peptides you want to make...like in this question r is 2(dipeptide)...s0 12^2=144 Q.19 is B...this is pretty easy......reduction division means the chromosomes are haploid..i.e they...
  19. S

    A level Biology: Post your doubts here!

    10 is B because in amine acid which is H2N-C(R)H-COOH, when a peptide bonds form one amino acid looses the OH from carbo-oxyl group and other looses the H from its amine group...keeping this concept, if u look the options B is the correct one. 13 is B ...When triglyceride is hydrolysed, the...
  20. S

    Mathematics: Post your doubts here!

    haha yes, the same thing...
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