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  1. salvatore

    BIO PPR 1 V1 <3

    Heyy.. hmm the option regarding phloem was something about the tissue at the tip of the root changing into phloem. This implies (According to what I think) xylem, which is at the tip of the root changing to phloem (Does that make sense? :confused:) And I found a question in may/june 2003.. the...
  2. salvatore

    BIO PPR 1 V1 <3

    For inheritance, i wrote genes only & for the development question.. I wrote mitosis. Not sure of my answers though..
  3. salvatore

    BIO PPR 1 V1 <3

    Fungi decompose the body and convert proteins to amino acids to ammonia. Nitrifying bacteria convert the ammonia into nitrates (Mineral ion!)
  4. salvatore

    BIO PPR 1 V1 <3

    I think D was correct.. In C, blood was flowing from the rest of the body into the left ventricle (Which is incorrect). According to the question u posted, both the top and bottom arrows are pointing in the same direction in B.. in our paper, arrows in C were pointing in opposite directions!
  5. salvatore

    BIO PPR 1 V1 <3

    The question stated that X is a circular muscle.. I think this was related to the shape of X (Ciliary body). So the answer was D.. the suspensory ligaments slacken (or something)
  6. salvatore

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Thanks a lot.. ur awesome! Best of luck for tomorrow..
  7. salvatore

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Water will diffuse through the potato into the concentrated sugar solution. This is because osmosis/diffusion occurs from a region of high concentration to a region of lower concentration (down the concentration gradient). Hence, the water will move into the concentrated sugar solution (since...
  8. salvatore

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Oh yeah.. I was wrong! Did some research now.. removal of undigested food from the anus is egestion. Removal of urea from the blood is excretion coz urea is a waste product. Thank u for clarification btw, I would've gt it wrong tomorrow! :p
  9. salvatore

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    The removal of urea from the blood is not excretion, but a process of filtration carried out by the kidneys! By definition, excretion is the removal of waste products from the body (As in, out of the body). So the only answer here is the removal of undigested food from the anus (C). Hope this...
  10. salvatore

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    The small intestine will absorb all the sugar from food and hence, blood vessel B will have the greatest concentration of sugar!
  11. salvatore

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Thanks a lot for the explanation.. really appreciate it. Hmm so when do sperms have to be released.. is it during ovulation??
  12. salvatore

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    I'm kinda confused here.. why can't the answer be C? According to me, C makes most sense!
  13. salvatore

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    For number 22, the question is regarding what is not controlled directly by the nervous system. The detector cells in the pancreas are the ones that detect the change in blood glucose concentration! The nervous system (Brain) causes insulin hormone to be secreted and blah blah. Therefore, it is...
  14. salvatore

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    People have different opinions here.. but I think that the answer is C. If the tip of a shoot is replaced by agar jelly containing auxin, the auxin will diffuse through the agar (since it is permeable) and will cause the shoot to grow more on the side where it is concentrated. The only answer...
  15. salvatore

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Hey, hmm that makes perfect sense! I didn't think of that earlier.. ur right, i guess!
  16. salvatore

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    I have it in my text book that, if the tip (coleoptile) of a shoot is cut off and replaced by agar jelly with auxin, the shoot will grow towards the direction of light! How about that?? :oops:
  17. salvatore

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Alaikum salam, someone had asked this question..
  18. salvatore

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    I think this is because the mixture of ammonia and nitrogen will not react or dissolve in water and hence, the gas will remain intact. In A, sodium hydroxide will react with carbon dioxide to form sodium carbonate. In B, Sodium hydroxide will react with sulphur dioxide to form sodium sulphate...
  19. salvatore

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Oh sorry.. i ws kinda confused. This is artrial systole whereby the atria contract and the ventricles relax to allow flow of blood into the ventricles. The tricuspid and bicuspid valves open up to allow blood flow between the atria and ventricles. The semi-lunar valves remain closed to prevent...
  20. salvatore

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    No probs.. this question is regarding diastole, whereby blood enters the left/right ventricle while it is relaxing. The aortic valve (semi-lunar) should remain closed so as to prevent blood from flowing back into the ventricle while it is leaving through the aorta.. and the bicuspid valve should...
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