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  1. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    What is the difference between accuracy and reliability of teh result. In the examiner report they say students who mentioned that taking three counts will increase accuracy than reliability. Why is it wrong? O.o
  2. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    I don't think so because I havent come across any such question while reading the ATP since 2000. So I guess no.
  3. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    If you wan't to look at the chloroplasts of a plant then the following steps are: 1) Cut a leaf with the help of a scalpel till the mid rib. 2) Soak it dry so that it won't interfere with the actual image being seen in the microscope. 3) Place the leaf on the slide and over it place the...
  4. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    Theres this question in Nov 2006 in which it says suggest one way by which a flower might be able to aviod self pollination. I've written that the ovum (female rep cell) and the pollen(male rep. cell) should mature at different times. Is it correct?
  5. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    I don't get this as well! High five! But read it from the pure. You'll get it. Some of it. lol. Like I did. But if someone gets it, please explain this stupid question which so will not come tomorrow hopefully and Inshaa Allah.
  6. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    There was this experiment which i dont remember but they were asking why dont we add water before the ethanol emulsion a.k.a the fat test? Or something like that? Anyone?
  7. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    Yep you're absolutely right. Isotonic solutions are those which have equal concentrations of water or solvent on both sides. Therefore no change in length occurs. Thus the percentage of water in both is same.
  8. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    Yep isotonic basically means that the osmotic potential is same in both solutions. So it means that water potential;l has to be same as there's no change in length. There is no net movement of water molecules into or out of the plant cell or whatever it is.
  9. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    Does a heart patient needs plant saturated or animal saturated fat? I guess plant but why?
  10. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    Alright! I got it btw. :) Thanks anyway.
  11. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    Oh lol right. :p(y)
  12. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    Don't we get energy from the sun? o.O I read it somewhere that the "Ultimate source of energy for all the living organisms including us is the sun" Wow tthats what our bio teacher said. :eek:
  13. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    In this part they're asking about the 'observable differences' that you have mentioned in the previous part. So you gotta link your answer to that. I guess. Not sure.
  14. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Biology%20(5090)/5090_w07_qp_1.pdf Question 6 ? Why cant the answer be b? As CO2 is entering into the test tube b, which is acidic in nature so the ph would fall below 7, no? Question 13? I dont get this AT ALL! :'(...
  15. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    Oh righttt. You mean that active transport needs oxygen as for active transport to take place, energy is required and which is obtained in the presence of oxygen. (Aerobic respiration) Its needed for active transport. Right?
  16. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Biology%20(5090)/5090_s13_qp_12.pdf Question 3? And in question 4 why does the iodine test give black colour when we have BOILED amylase which means that the enzyme got denatured. Thus the enzyme wont act on it and the...
  17. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Biology%20(5090)/5090_s13_qp_22.pdf Question 1 part c. Section B question number 6 b.
  18. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    Yep I know about the glucose and the potassium ion theory but there's this question in M/J 2013 in which it says that what is the advantage of the difference in the guard cells at 13 00 and 1 00. Plus why do crops that are grown genetically produce fewer offspring and less variations? M/J 2013
  19. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    The role of micro organisms on the root nodules in the nitrogen cycle? Anyone? Plus can anyone explain explicitly the mechanism of opening and closing up of the stoma during day and night?
  20. Mahnoorfatima

    Biology; Chemistry; Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Physics%20(5054)/5054_w08_qp_2.pdf Question number 10 cii anyone?? Question number 11 b part iii And quetsion 7 part B??????
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