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Exactly! even if the answer is not exact, you should select the option closest to your calculated value. The concept behind the calculation is what really matters.It is quite useful in Physics Paper 1 and even in Bio now...
people am reposting my qns, can someone please help
thx
the ans in ms is A
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s04_qp_1.pdf
ques 23....why isnt it C? the ans in ms is B
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w04_qp_1.pdf
ques 19....i dont get it
Link?ques 3, june_10 qp 11 plzz guys help!!!
thanx soo much man! God bless you!qn 10 - It cannot be solution 2 since the colour before adding acid and neutralising was orange and the colour did not shift towards red after hydrolysis with acid, which would have been the case, had the solution contained non-reducing sugars. The green colour after hydrolysis is due to the reducing sugars. Remember, to confirm presence of non-reducing sugar, the colour should always become more positive for the test after hydrolysis.
qn 21 - The answer is infact C, check the MS: http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w11_ms_12.pdf
qn 28 - Its vessel and the tissue is xylem since you cannot see any sieve pores and sieve plates (present in phloem) and the structure is continuous/hollow tube with spots, indicating pits in the walls (which are a feature of xylem vessels).
qn 34 - Only C is the effect of smoking. Tar is cigarette smoke stimulates goblet cells to secrete more mucus, so the goblet cells become enlarged. D cannot be linked to cigarette smoke.
qn 39 - 1st we have to calculated the net primary productivity which is = gross productivity - energy loss in respiration, where gross productivity is light energy - reflection and transmission (1000 000 - 990 000 = 10 000). Thus net productivity = gross - respiration = 10 000 - 5000 = 5000. The percentage is then = (5000/1000000) x 100 = 0.5 %
thank you so much!! God bless you!10 - if a solution contains non-reducing sugars as well, then after hydrolyzing the color degree (relating it to the reducing sugar conc) must increase, eg. if it was blue before, after hydrolyzing it became orange. this happens in 1 and 3 only.
21 - the answer is C
28 - ok the vessels with these patterns are xylem. cuz lignin deposits on the xylem vessels in patterns...so X is xylem, and xylem doesnt have sieve tube elements it has vessels so D.
34 -C the enlargement of goblet cells in the bronchi >>yes this becuz tar causes mucous glands to enlarge and goblet cells to produce more mucous. This is directly linked to smoking.
D the increase in smooth muscle >> this is a result of replacement by the scar tissue, causing the smooth muscle to increase, but this is a result of chronic bronchitis...it is not directly linked to smoking. This is sort of a long term affect.
39 - ok net 'primary' productivity is what they are asking for, that will be the net productivity for producers...
so fixed energy = 1 000 000 - (990 000 + 5000) = 5000
so to get the percentage = (5000/1 000 000) x 100 = 0.5%
Translation has to happen before condensation, since translation is the pairing of codon (on mRNA) and anticodon (on tRNA) whereas condensation is the formation of peptide bond between two amino acids that are brought to the ribosome by the tRNA (the amino acids are attached to tRNAs). Therefore, translation (temporary binding of tRNA to mRNA, to bring amino acids together), must occur before condensation (peptide bond formation between the amino acids once they are brought close to each other via codon-anticodon binding).rogue94 and geek101 i meant to say why is it C and not A for qn 21.....sorry, my bad:/ I m really confused
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w11_qp_12.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w11_ms_12.pdf
Sorry and thnx again
rogue94 and geek101 i meant to say why is it C and not A for qn 21.....sorry, my bad:/ I m really confused
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w11_qp_12.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w11_ms_12.pdf
Sorry and thnx again
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