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  1. S

    Biology; Chemistry; Physics: Post your doubts here!

    It allows a good supply of fresh air to enter and leave the plants. The buildup and reuse of the same carbon dioxide could damage the plant and hinder the process of photosynthesis, producing insufficient glucose/carbs. Oxygen needed for respiration must also be replaced by cleaner air from outside
  2. S

    Biology; Chemistry; Physics: Post your doubts here!

    What are the important parts/ pints to remember in asrxual reproduction in plants?
  3. S

    General paper discussion

    Listen if my curve crossed the space of the graph that they gave us by 1 mm, will I be penalised for it :s cause everyobe I know only took less than 75% of the graph paper to draw their curve (which usually leads to a loss of marks)...so yeah what was the better approach?
  4. S

    Biology; Chemistry; Physics: Post your doubts here!

    You draw the sternum vertically through the middle of the diagram. H are the ribs, f are the bronchioles and g is the bronchus
  5. S

    General paper discussion

    What did u guys write as the reason for the decrease in voltage? Wasn't it the blockage of sunlight due to the students head? Also in the experiment to determine the volume of the stopper, what apparatus did u take? I used both a beaker and measuring cylinder (to determine an accurate value of...
  6. S

    General paper discussion

    Wait that was the answer of the 1 st part na? That the direction of the current was reversed, so he was getting a negative value of the voltage
  7. S

    General paper discussion

    I got 9.95 for f, the whole apparatus could be placed outside where there would be a greater availability of sunlight (I have my doubts about it tho). Precautions: avoided parallax error, took the measurement only when a sharp and focused image was formed on the screen (not sure about 2nd point)
  8. S

    General paper discussion

    Now that 24 hours have passed, lets discuss the physics atp...what was your value of f? Also how could the problem of the voltage drastically decreasing be avoided (in the last question). And what precautions the student take to make his values of v as accurate as possible?
  9. S

    General paper discussion

    I marked no more hydrogen is produced
  10. S

    General paper discussion

    T There was a second part to the question? X_X
  11. S

    CIE Chemistry ATP P.42 MCQ query :

    The question stated that magnesium reacts with 10 cm3 of 0.01 moles of hcl to produce h2. Which of the following would produce double the volume of hydrogen. 1)10 cm3 of 0.02 moles/dm3 of hcl 2)20 cm3 of 0.01 moles/dm3 3)20 cm3 of 0.02 moles/dm3 4)40 cm3 of 0.01 moles/dm3
  12. S

    General paper discussion

    Yeah so 0.04 moles of hcl gave 0.02 moles of h2 :S
  13. S

    CIE Chemistry ATP P.42 MCQ query :

    It should've been a :S the original equation had 0.02 moles of hcl which produced .01 moles of hydrogen. To produce 0.02 moles of hydrogen, 0.04 moles of hcl was required...I think
  14. S

    General paper discussion

    But for o.02 moles of hydrogen to be produced, 0.04 moles of hcl should react :s in the equation given in the question, there were 0.02 moles of hcl and hence 0.01 moles of hydrogen na?
  15. S

    Biology p2 revision/notes

    Does anyone have notes on ecology and effect of man on ecosystem?
  16. S

    General paper discussion

    Wasn't the answer to that a? The number of moles had to be twice that given in the question. If the volume remains the same and the concentration is doubled, it gives 0.04 moles while the number of moles given in the question were 0.02. Both the volume and concentration were doubled for c which...
  17. S

    Biology; Chemistry; Physics: Post your doubts here!

    Haha I checked the marking scheme :p it should be clamped tightly so that the wire would be secure and wouldn't move on it own. In case the wire breaks, one should wear safety goggles, as a broken wire is hazardous for the eyes
  18. S

    Biology; Chemistry; Physics: Post your doubts here!

    Cant u add the time taken for all 3 experiments and divide that by 60 instead?
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