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  1. smart_boy

    Physics, Chemistry and Biology: Post your doubts here!

    Thanks a lot...!!!
  2. smart_boy

    Biology; Chemistry; Physics: Post your doubts here!

    Hi, can you pls help me out with IG 0610 Biology nov 2003 paper 3 Q3(b),(c) and (d)... Pls help as soon as possible cos my exams are not very far... :(
  3. smart_boy

    Physics, Chemistry and Biology: Post your doubts here!

    Hi, can you pls help me out with IGCSE Biology nov 2003 paper 3 Q3(b),(c) and (d)... Pls help as soon as possible cos my exams are not very far... :(
  4. smart_boy

    Physics, Chemistry and Biology: Post your doubts here!

    When oil or petrol is pumped, the high speeds they are pumped at, causes friction with the pipes and the container.. If the rubber of the pipe and the material of the tanker are electrical insulators then they can develop a charge because of the rubbing... If a spark gets produced because of...
  5. smart_boy

    Physics, Chemistry and Biology: Post your doubts here!

    I hav come across the question u asked, in one of the past papers.. The answer is that chlorine gas first dissolves in water around the anode and then finally bubbles out... I'm not sure about other gases but usually gases like oxygen and hydrogen are not very soluble in water..
  6. smart_boy

    Physics, Chemistry and Biology: Post your doubts here!

    Respiration is DEFINITELY controlled by enzymes... This is evident as seeds cannot germinate when boiled because enzymes are denatured so seeds cannot respire and release energy for growth. Photosynthesis is also controlled by enzymes because if you place the plant at a high temperature, rate of...
  7. smart_boy

    Physics, Chemistry and Biology: Post your doubts here!

    Okay... Thanks..:)
  8. smart_boy

    Biology; Chemistry; Physics: Post your doubts here!

    Ohh... I get it.. Thanks..!! :)
  9. smart_boy

    Physics, Chemistry and Biology: Post your doubts here!

    But what is the logic behind A being the ans...??
  10. smart_boy

    Biology; Chemistry; Physics: Post your doubts here!

    Can you kindly explain to me..??
  11. smart_boy

    Physics, Chemistry and Biology: Post your doubts here!

    I understood... Thanks a lot..!! :)
  12. smart_boy

    Physics, Chemistry and Biology: Post your doubts here!

    Can you kindly explain it to me..??
  13. smart_boy

    Biology; Chemistry; Physics: Post your doubts here!

    Please help me out with some more doubts..!! I am uploading the two pics of the questions.. Pls let me know as soon as possible because exams aren't far..!!:( (btw the incomplete word in one of the pics is 'germination')
  14. smart_boy

    Physics, Chemistry and Biology: Post your doubts here!

    I got the answers to the previous questions.. Thanks anyway.. Could you please help me out with some more doubts..?? I am uploading the two pics of the questions.. Pls let me know as soon as possible because exams aren't far..!!:( (btw the incomplete word in one of the pics is 'germination')
  15. smart_boy

    Biology; Chemistry; Physics: Post your doubts here!

    I dont know much about o level books but there's this book called IGCSE Biology Coursebook Second Edition by Mary Jones and Geoff Jones. It covers the entire O level syllabus. All of the concepts u hav posted here as doubts - the book can explain beautifully to you... If u find biology difficult...
  16. smart_boy

    Biology; Chemistry; Physics: Post your doubts here!

    Potassium sulphate is water-soluble so u can use acid-base titration for making it... ur reactants will be potassium hydroxide and sulphuric acid... The other method cant be used as most potassium compounds are soluble in water... I hope u get it now...
  17. smart_boy

    Biology; Chemistry; Physics: Post your doubts here!

    Firstly it depends upon the salt.. NaCl, K2CO3, Cu(NO3)2 these are all soluble salts whereas BaSO4, AgCl, PbBr - all these are insoluble. For insoluble salts, a double displacement reaction needs to occur between two salts or an acid and salt... For example NaCl + AgNO3 gives AgCl and NaNO3...
  18. smart_boy

    Biology; Chemistry; Physics: Post your doubts here!

    Dont you think you have a really LONG list of Doubts..! Still I ll try my best to help you as far as I can... 4b) investigate the necessity for chlorophyll, light and carbon dioxide for photosynthesis, using appropriate controls. This section is all about practical work involved in...
  19. smart_boy

    Biology; Chemistry; Physics: Post your doubts here!

    Thanks.. That site explained well.. Next i need to ask what is the difference between 'dendrons' and 'dendrites' in the human nervous system..??? And out of sensory and motor neurones, which has which and why..??? Pls help me out...
  20. smart_boy

    Biology; Chemistry; Physics: Post your doubts here!

    Ok... Thanks... :) I need your help again.. I am posting a pic of a question.. The ans is D in the marking scheme but i cant understand whats the logic behind it.. Pls hav a look and help me if you know...
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