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  1. Saad (سعد)

    Some biology practical doubts

    Different. And that's why, you don't rely on guesses, you rely on God. :cool: Anyways, may Allah expand our breasts for us all and ease our ways for us all and guide us all to the straight way, Ameen, ya Arhamar-Rahimeen. Going to bed; see you later guys. (y)
  2. Saad (سعد)

    Some biology practical doubts

    34.
  3. Saad (سعد)

    Some biology practical doubts

    1) A lot thicker. 2) Yup, a lot thicker. 3) I have the book, but I can't upload. I don't have access to anything which I could use to upload it atm; no camera, no USB cable, no scanner. And its almost my bed-time. o_o Sorry dude.
  4. Saad (سعد)

    Some biology practical doubts

    Don't let your eyes deteriorate. It'll come back and bite you later on. As for M/J 2007 p31... it says prepare them by serial dilution. They did tell you how to perform it. You were supposed to do it the other way; serially dilute them, from 1%, to 0.1%, to 0.01%, to 0.001%, to 0.0001%, etc.)...
  5. Saad (سعد)

    Some biology practical doubts

    1.5% is a kind of number which cannot be done the other way, I think.
  6. Saad (سعد)

    Some biology practical doubts

    Do you have Salma Siddiqui's "Practical Biology" book? If you do, you can find everything there. In the 'TS of Tracheal Wall', just remember 'Epithilium' is the uppermost layer which contains Goblet cells, then under that is 'Lamina Propria' which contains connective tissue, smooth muscle...
  7. Saad (سعد)

    Some biology practical doubts

    The same way as explained above with 10%. The way of making serial dilutions is the same no matter what the concentration of the stock solution is - take 1 cm3 of the original solution and 9cm3 distilled water each time, or 5 cm3 of either one, depending on the question. In the example I...
  8. Saad (سعد)

    Some biology practical doubts

    Don't worry about being astigmatic (I'm about 90% sure I'm astigmatic too, I just forget what the eye-doctor exactly said since I see him like once in a year and a half. >.>) Just don't remove your glasses when looking at the slide like most people do. It'll be a bit uncomfortable, but you'll...
  9. Saad (سعد)

    Some biology practical doubts

    o.o Yes, use that method and make those concentrations the same way. Beware; only use this method when they say 'produce a range of concentrations using serial dilution'. They can also ask you make 5 different concentrations with equal intervals, of something, from the original solution; such as...
  10. Saad (سعد)

    Some biology practical doubts

    Bismillahir-Rahmanir-Raheem. Let's say you have 1.0 mol dm-3 sucrose solution, and you are required to make five serial dilutions of it. Label 5 test-tubes/beakers with 1.0, 0.1, 0.01, 0.001, and 0.0001. Put 10cm3 of the 1.0 mol dm-3 solution from the main solution you are provided, into...
  11. Saad (سعد)

    Some biology practical doubts

    When the protein denatures, it coagulates (forms 'clots'). The more protein that is coagulated due to the presence of CuSO4, the greater the optical density of the solution (the less light will pass/more light will be absorbed). For example, the optical density of a glass of pure water is much...
  12. Saad (سعد)

    Some biology practical doubts

    If only vascular bundle is visible, then you can draw a line like this: VB }---------- Label 'VB' is your Vascular Bundle on your drawing/photomicrograph. However, if xylem, phloem, cambium, sclerenchyma etc. are visible inside the vascular bundle, then instead of labelling 'Vascular...
  13. Saad (سعد)

    "A-Level exams are finally going to get harder" -CIE

    I doubt that... I think they'll become strict in checking and limit their GT calculating method or something, so the GTs are higher, and make tougher papers, like the ones that used to come 1984-2001. ... I think we AS students should be spending next year doing really old papers. Someone...
  14. Saad (سعد)

    Some biology practical doubts

    Yeah, Jazak Allah Khayr.
  15. Saad (سعد)

    Chemistry Paper 22: Discussion and Grade Threshold

    60.
  16. Saad (سعد)

    A level Biology: Post your doubts here!

    Okay, this may sound like a really, really dumb question. But someone please tell me... how do you annotate a diagram? I've almost completed my AS-Levels but I still don't understand what annotation even means. >.<
  17. Saad (سعد)

    Some biology practical doubts

    If you meant how to label Xylem and Phloem, then only a straight line. No circles. Straight line leading out from the Xylem or Phloem to the side of your drawing, and then write down the label there. Keep in mind, while drawing a plan diagram, that there should be ample space on the sides for...
  18. Saad (سعد)

    Some biology practical doubts

    What do you mean 'by drawing circles'? o.O
  19. Saad (سعد)

    BIO PRACTICAL 34

    Agar saare qatl ya badkaari karain to kiya aap bhi karo ge aur yeh kaho ge ke ye burai nahi hai? Naodhubillah. Cheating cheating hoti hai, chahay aik karein ya saarey. Hamari puri qawm inhi kaamon ki wajah se doobi hui hai. Try your best, then put your trust in Allah (tawakkal), knowing that...
  20. Saad (سعد)

    Some biology practical doubts

    I've done lots of practicals but I'm still scared. I can't observe very well, and its hard to judge what something is in the microscope to label it. I mean, sure, everyone can find the plasma membranes, cell walls, nucleus, cytoplasms etc. but there are times when an Examiner requires more than...
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