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  1. Y

    Physics, Chemistry and Biology: Post your doubts here!

    Guys got a slight question here. Should our answers for long and structured questions include all the points from the mark scheme?
  2. Y

    Biology paper 3

    Eutrophication is the only negative effect. Positive effects are many. Like faster growth because of protein production etc.
  3. Y

    Biology paper 3

    LH: -Stimulates release of mature ova -Stimulates development of corpeus luteum FSH: -Stimates development of graphian follicle Oestrogen: -Repairs uterus lining Progesterone: -Maintains uterus lining during pregnancy -Prepares uterus lining to accept a zygote -Prevents release of FSH
  4. Y

    Biology paper 3

    It is a process taking place in the liver where the nitrogen containing part of of the amino acid is converted to urea and the remaining part is used to produce energy.
  5. Y

    Biology paper 3

    First of all, ATP is Adenosene Triphosphate. It is the basic source of energy, so during respiration energy is released in the form of ATP. ATP can be used for storing and releasing energy. When energy is released, one phosphate molecule is removed from the ATP so it is called Adenosene...
  6. Y

    Physics, Chemistry and Biology: Post your doubts here!

    Yeah, you did. Thanks.
  7. Y

    Biology paper 3

    Actually that part isn't in our syllabus. Lacteal is basically an extension coming out of the lymphatic system. For example an artery separates and makes capillaries. The lymph vessels separate and makes an extension called the lacteal. A lacteal is joined and connected to the lymph vessels.
  8. Y

    Physics, Chemistry and Biology: Post your doubts here!

    So the nitrogen containing part is used for making urea and the remaining is used for energy production.
  9. Y

    Physics, Chemistry and Biology: Post your doubts here!

    Guys, what do we need to know about Deamination? Is the definition from the syllabus enough?
  10. Y

    Biology paper 3

    A villi is a finger like structure present in the small intestine, there are many of them giving a large surface area for diffusion. A villi has both capillaries and lacteal in it. S o a villi is basically a structure that absorbs digested food. Glucose and amino acids diffuse in to the...
  11. Y

    Biology paper 3

    Yeah completely different. Because nitrogen fixing bacteria convert nitrogen to nitrate/ammonia directly. Nitrifying only converts ammonia to nitrate.
  12. Y

    Biology paper 3

    Anytime.
  13. Y

    Biology paper 3

    Nitrogen fixation is done by bacteria present in root nodules of plants. The bacteria convert the nitrogen in the soil to a more reactive form such ammonia or nitrate. The plants then absorb these fixed nitrogen compounds and make proteins. Animals then feed on the plant and obtain proteins...
  14. Y

    Biology paper 3

    Don't stress yourself. You will lead yourself to more confusion. Take it easily. See, for dialysis machine it is more like "artificial kidney" it filters and removes the urea and salt by this principle: The blood coming out of the vein is directed the dialysis machine. The dialysis machine...
  15. Y

    Physics, Chemistry and Biology: Post your doubts here!

    Okay thanks. Now I got it.
  16. Y

    Physics, Chemistry and Biology: Post your doubts here!

    Can some one explain this part of the syllabus for me: Explain why there is an increased efficiency in supplying green plants as human food and that there is a relative inefficiency, in terms of energy loss, in feeding crop plants to animals In my notes the explanation is as follows" If plants...
  17. Y

    Physics Guide

    Guys there was a slight error in Nuclear Physics. I fixed the table. I uploaded the updated version.
  18. Y

    Physics Guide

    The topics will be up either tomorrow or after tomorrow.
  19. Y

    English listening.. really?

    I wrote it was used for defense.
  20. Y

    English listening.. really?

    Thank god I wrote it is the longest horn ever discovered.
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