• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Search results

  1. M

    How was Biology Paper 5?

    You'll get points for mentioning the need to equilibrate the plant tissues to the same water potential, I didn't mention that. As for the oocytes. The hypothesis was testing the effect of the activator compound on the maturation of immature oocytes and in order to keep them immature, you cannot...
  2. M

    Maths (Paper 3)

    Easier and comprehensible way of finding the perpendicular distance from a point to a line (both of known position vector and vector equation, respectively) Alright, so lets assign some variables first our point P will have position vector (a, b, c) our vector l will have equation r = (f, g, h)...
  3. M

    How was Biology Paper 5?

    True that. Let's hope for the best. Although I feel kinda bad that I prepared so damn hard but in the end it didn't really matter. Meh... frustrated that I did well (LOL, I am crazy!)
  4. M

    How was Biology Paper 5?

    It was boring.. :/ The stuff I wrote in 1 (a) had to be repeated in 1 (b) because I had mentioned the variables, how to control/measure them, the constants, how to control them and what not. I messed up the rate, I wrote cm-3s-1 and I completely ignored the fact that we can measure the movement...
  5. M

    Biology P5

    Ugh, could the questions get any more boring? What are you supposed to write in that sort of exam? I will surely get an A but it's not an A worth boasting about. I had prepared so well and worked my ass off for that? =_=
  6. M

    Biology P5

    POTOMETER ADDITIONAL PROTIP: Cut the plant underwater to avoid air bubbles from entering the xylem vessels! Air bubbles block out the passage of water.
  7. M

    Maths (Paper 3)

    Would be glad to help. Some of the most annoying graphs are from complex numbers as many of the students find it difficult to wrangle with the Argand Diagram and vectors can be annoying at times as well. I have quite the base in both of these so I can help as far as possible. Amazingly, there...
  8. M

    Biology P5

    Speaking of which, cheap marks galore: - The volume decrease is determined by measuring the distance moved by dye - The actual volume is = l x (pi)r^2 where l is the distance moved by the dye and r is the radius of cross-section of the capillary tube (the gas syringe is already calibrated to...
  9. M

    Biology P5

    For a respirometer, I'd recommend using a manometer with a moving dye indicator. It is more accurate as no air can pass through the dye at all whereas it may pass through in a gas syringe. It's all about accuracy and reliability and using the best suitable apparatus.
  10. M

    Biology P5

    The Sm means the standard error, meaning the actual value may be errored by that much, either positively or negatively. So, it would be mean +- Sm. The 2Sm comes from the fact that the difference between m + Sm and m - Sm = 2Sm. Use mathematics people, just because this is biology does not mean...
  11. M

    Biology P5

    The point is that the error ranges from the bottom ( - Sm) to the top (+ Sm) so the difference (the range of plot) would be + Sm - ( - Sm) = 2Sm
  12. M

    Biology P5

    It is significant when t is greater than the critical value and you can reject the null hypothesis.
  13. M

    Biology P5

    There are 4 strips for each 5 leaves so the total number of data = 4x5 = 20 and root(20) = 4.47 degrees of freedom = n - 1 = 20 - 1 =19
  14. M

    Biology P5

    I have had at least 3 people ask me this in my personal life already. It is quite tricky and CIE really shouldn't expect us to waste a lot of time figuring this out because there is already so much pressure. Alright, so here you are comparing two pHs which were tested for 20 hours each. So, for...
  15. M

    Biology P5

    A null hypothesis is a supposed opposite of the hypothesis that we are actually testing. So, if we are testing the difference between two results, the null hypothesis would state that they are not same, not different. Types of variables: - Independent variable: the variable that does not depend...
  16. M

    Biology P5

    Okay people, keep it coming, what else do we have? Potometer, Respirometer, Alginate beads, what else do we have?
  17. M

    Biology P5

    Of course it will make a difference, that's why we are comparing them and the effects that different light intensities have on them. We are not just observing the effect of light intensity of leaves, we are investigating the difference in the effects in two different types of leaves.
  18. M

    Biology P5

    Actually, the pigments have bonds in them that are broken at high temperatures as well so the light-dependent stage is also sort of temperature-dependent
  19. M

    Biology P5

    You are comparing the effects of light intensity on the two types of leaves so you would vary light intensity, wouldn't you?
  20. M

    Biology P5

    RESPIROMETER - When using it to compare the rate of respiration of two different species, make sure the same mass of each species is used in the test. - When testing the rate of respiration of seedlings, make sure they have not sprouted green shoots yet (as they will photosynthesize and give...
Top