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  1. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    Why do bubbles form?
  2. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    Q) How can we demonstrate the presence of stomata in a leaf?
  3. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    that only goes up. :(
  4. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    Okay this is probably a stupid question but this has been bothering me since day1. When testing for importance of chlorophyll in a leaf, we first remove chlorophyll from the leaf by putting it in ethanol. This means that the leaf doesn't have chlorophyll and can not photosynthesise. Then no...
  5. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    But what are you preparing? Pollen grain or animal/plant cell or epidermis or what?
  6. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    Thank you so much. :D I got it! Yeah I will answer your Slide question, gimme a few minutes.
  7. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    Thank you so much. :D But please do explain as well..
  8. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    Its from June 2002's ATP paper, I want to send you the link lekin I can't find it online. :/ Do look if you have the past papers.
  9. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    (d) You are provided with two pure-breeding varieties of the same crop plant; one is resistant to weed-killer and the other is non-resistant. Explain how you would carry out a genetic experiment to determine whether the resistance is dominant or recessive. [5] I dont get questions like these...
  10. Laibaaa

    Chemistry Imran Merchant's guess.

    but a student of his said he did give a guess to all his students :/ anyways, if someone does have it, please do post it here
  11. Laibaaa

    Chemistry Imran Merchant's guess.

    2013's guess if anyone wants to practice it.
  12. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    Thank you so much, got it. :)
  13. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    Thankyou :D
  14. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    Its H2O for oxygen with the ratio of hydrogen to oxygen is 2:1. So Hydrogen is 20, then oxygen evolved will be half of it acc to the ratio. 20/2 is 10cm3. :) Hope that helped a lil x
  15. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    Its H2O for oxygen with the ratio of hydrogen to oxygen is 2:1. So Hydrogen is 20, then oxygen evolved will be half of it acc to the ratio. 20/2 is 10cm3. :) Hope that helped a lil x
  16. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    Suree. :) I'A and thank you very much
  17. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    Yeah its correct but the logic behind it?:/ really don't get it
  18. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    http://www.taleem-e-pakistan.com/cambridge-university/o-level/past-papers/o_level_past_papers_2011/o_level_physics_past_papers_2011/5054_s11_qp_21.pdf Pg 12, Q10
  19. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    (iii) The 1500 Ω resistor on the electronic circuit board has a correct power rating of 0.25 W. State a disadvantage of using a different 1500 Ω resistor with a power rating that is 1. much less than 0.25 W...
  20. Laibaaa

    Biology; Chemistry; Physics: Post your doubts here!

    10 (a) Describe an experiment to show the difference between an electrical insulator and an electrical conductor. Name one example of each. [4]
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