2012 Biology Example Paper Dse Hong Kong

Topics: Bacteria, Stem cell, Stem cells Pages: 6 (1369 words) Published: December 13, 2012
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This paper must _e _n_wered in en_lish
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(1) There a_e __UR sectons, A_ B, C and D in t_is Paper. &t__mpt ___ ques_ion_ in _ny TW0 sect_ons.
(2) Write your answers în the Answer _oo_ D_E (C) provided, Sta_ e_ch ques_ion (not pa_ of a question) on a new page.
(3) _resen_ your answers in p_rag_aphs wherever appropriate, (_) _llustr_te your a_swers with diagrams wherever appropriate. (5) The diagrams in this paper are N_T necessari_y drawn to scale.

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_ECT_0_ A __man Physìology; _egu_ation and Control
Answer AL_ parts of the question. .
l ,(a) In a s_dy about the reptenishm_nt of water after exercis_, participants performed exercise until t hey lo_t 1 500 m_ water. They were then divided in_o 3 groups and ashed to consume a 2 OOO m_ sports drin h containing O, 50 and 1 00 mmol / L sodium respec_iv_ly. Urine samples were cotlected at 1 -hour interval_ for 6 hours and the net body _uid balance throughout the cours_ of the e_peri_ent was determin_d. T he results are respectively shown in the _igures 1A and lB below:

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Intahe Of Tnta_e of
SPOTtS dT'nk sports drinh
(i) Describe the general _atte_s of the urine output a_ter consuming drinhs wíth different sodium concentrations. ( 4 mar hs )
(ii) Account for th_ high urine output of th_ pa_icipants who cons_med sports drinh with 0 mmol / L , sodium. (4 mar_s)
(iii) In terms of the replenishment of water, which sports drinh would you recommend for athletes to consume a_er exercise? Explain your answer, (3 marhs)

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_' _ b _n the stud descrl_bed __n a the art__c__ ants erformed exerc__se __n a room ma__ntal.ned at 34oc and 6o 7ooi re l ati ve hum idi ty. '
(i) State lwo majo_ ways in which participants lost water during exercise. (2 marhs) (ii) _f the temperature and relative humidity in the room had been set higher, it wou1d have been dangerous to the participants. Explain why this is so. (4 marhs) (iii) A_er the exercise, the breathing rate of the participants remained at a fairly high l_vel. Ex_lain the signiflcance of this. (3 marks)

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Answer ALL parts of the question.
dierent stages of shifting agricuIture:
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nu_ient is probably lacking? Expl_in your answer. ( 2 mar ks) 2ol2-Ds_-BIo 2_ 4

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.(b) An artlflclal reef (AR) lS a man-made StrUCtuTe de_lOyed On the Sea ed tO enhanCe bl0dIVerSlty. ten-year study was ca_ied ouT on a sandy seabed to investiga'te the effect of an AR on the number of f1sh...
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