Biology 2001 Paper I Marking

;..:

MAY 29 '01

08:25

2-D° ( ~ Marks

Effectivecommunication(C)

1

@

) It can rccycle the nutrients/reduce the dema~doftnorganic fertilizers l/Bit(u /1.I41,I1Ytwo ..1,1 ma~esuseof the effluent as a source of nutrient supply for the crop growth ) It can ?reverttal.al bloo~g in the river due to the dischargeof the effluent) I?t(~ _"1,/

(il)

,

..'

(iii)

So~l

ThIs

thusof

.'.

erosIon

may

leads

the.

to

reducing

OCCur.l~

the

m?~talns

deposItIon

the

reservoir

Ii the

water

of

.1.Yr..WA(Lv.,CtI.JI.l.t((t~ci

supply

.I.I.,~ ~ .,.AI'

1./~I'!(l.~.lKt(

silt

In

to

.the

thetoWll

f

a

1

.o..(it-t.I.I.({

reduction

In

.,.,..""""".."".,...:

I

"..

',"""'/::' Ef

.l:1i'.tt..:.'/.~~,\'J'.I:

reservoir

.""""",.,."""""."."

.""

the

:..

water

:...

storaie

capacJty

""'. ,

"""

or The Soil Watcr

water erosion in

the

qualitymaYOC(:9me may reservoir

occur

may in

the

caary

mountains poor

a

lot

ofsuspcnded

partlclcs/

;

soil

ntincrals

any one set

:..

or Less Surface water ron-off is gathered of water inincreases the reservoir.~

:

thus reducing thc water$\1pplyto the town

(ii)

(1U) .0.), ({'!))

""""~""".'-~."

Total: 10 + J marks

(iv)

.'

1



glucosc I amino acids 1.~t40gl"~~

:.;, '.'..'.'..'"

by active uansport

,,' ;'

~

Thc rcabsowtion of water from thefluitJ:s. it P4ssesalong the coll~~tingduct

..."'.'~Y'"

" '

~

Proteins are p:esent in the b~oodplasnia but not in the fluid i9-thc n~1U"on ; ,. "'.-.'" ...1 becauseproteins are~;~ tO~t~l~9..~gt ~c wall ofth~IO~;J;'lt~~~}QWlnan s capsule) ...1

I.(b) (i) ." I'.,:":

"""""""'"

Ctdtffn.s;dJ..

.~."O~&.'('tA. .f-/:f);"'.'"

'

~

I Effectiv4 communication(C)

::~;:~~~:

(2)

(ii)

~l'

~

' " ~...

k,~.

~'fff..tf~

~. ";'.~

.Total:

I'

1'2,"

~.~ :

:

APeJ.{ct/iI11K Coo#f!1u 1JC UtWl, crown

(.I~

X

pulp I pulp cavity

root jaw bone

.-~:~ (iii) ,-'.-.:-;:;:::: "'\'...1. M ..~,~~

Structur~()fthJmola~ (~~f;(.)(.) . Food could not begroundorcriishedintosmallpjece~te}\Wd«tabe less mechanical digestion 1 Thc surface areafor ~e action ofdigestlveenzYJneswoul~nQt,be large ~nough """F~_"" ,:..':t'.., " 1 It would take longer tIme tor the~ to be broke!1~ Into slm{>_le soluble forms ,V1~..~/UlCq"t1.x)1

2001-CE.-BtO1-3

.R ~N*fGi1i:f!:fJU

y '.f~p7~~1~

,.,.;"pe"ffl>1

""

1. to, 0 2~ Y2.

""..'..'..".".""."""'."""."""' .enamel, dentine

)

Yz,Yz,Vt ~

Labels (L) : * en~mel,dentine,pulp I pulp cavity, jaw bone, root. crown (any five)

..'

I 11+ 1 marks

~ ...,

A, S,D :..ti:fi.~.~{.'4J)..

(T)

1 ) I 1

-1

Drawi11g(D):(resemblance, large&eleardrawing)..tAtl.'ltlof TI'tle

'."f~

'~(,.£. .1.1".,(. ..1):':kt\il~fY~

Thc amount of urea excretedwould increase ; becausebcans contain a lotofpro~in which is digested into amino acids I is ab$()rbedin the ConnoCan1ino~cids ~. Excessamino acids are broken down in the liverforttling urea thus an increasedamount of urea will be excreted < ~.";\~ (lito p.#{A.~ >

',' c.(.r.~~it~ ( I) C ., 1.(c:) (i)

1 1

I'(~t.(rz(lt(-

/ 1J1C41H£.~ /{!j!$(((J}t

.

t(:/I..r:.!r°t!J ~t~~

FO~ TEA(:;HER5' USE ONLY

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852-2602-0411

put

YlNG COLLEGE

,R'.-BiJen

172 P02

MAY 29 '01

'" :FORTEACHERS'USE ONLY

2001 CE Biology Paper 1 Marking Scheme"

2.(a) (i)

,

Marks

rOS~IPp.'ynutrient~/ox~gentotheeye.ball:...~.~~ :: as it ISnchlysupplledVflthbloodlcaptllanes..('$;) or ~ -.~.. -one 0 T.o~~~~&tJ.tJVithin the,;l!e .(.~If
~ LU any ~

asitcontains~pignients ...~.kl~t<.;...~~':\.;\~.V..l.;

~

(ii) (iii)

0

08:26

LlJ

The imageformedonC can.~while thatformedonB CaMot~~ because therearelight.sens.t' e cellsatC butnoneatB i.t."v.L "..1";./t{"".~,, >StructurePwouldbec'o1e im1e~/lcssbonvex...')f{I" "~' I """"""""""'" ..' db hi fth eiriCI 1larymU$C ' Ie. ligaments... .,. ThIs whichISleads cause to an y increaSe t ere axattono in tension the suspensory 1.,(' x)

,

.

set

!

I J

6,

.

1

\I

and,in turn, stretches the lens

(i\l)

Drawing(D):

large, clcarand accuratediagram , 1 (accuracy includes outline of eyeball,lens of eye, straight lines for light rays) (L) : Parallel rays frOI1'!object (with afTOW sign), focus in frOntof retina, rays cxtended to retina.. 3 x lIS lIS Title(T) " ',

~

~I.'I/.J.O~?t~'" -*JO'

)

p~ I-J. ~ T

-:'\

I-

,I

-((;I-~J:;i1t~)t.. a short-slghll!d eye

~!!!~~~~~~~~g

t>.1.

\ ~ t

~

Total:

2.(b) (i)

Undcr bright lig?t c,ondition, the rate of photosynthesis of the plant becomes greater than

Meanwhile, the carbon dloXld~-lcvellnsl"e the s)'nnge remal~ v'This results In an increase i 'airpressu~inside thcsyrlnge :

Effective colnl"unlcallon (C)

(ii)

(1)

.~II.

constant

:

",.",.".

J I

1

Nct rate of oxygen produced by the plant ".~~p,o.9,~m)~2min-I).{I.CI~e~A'1.J;'.'JJAth.2 Rate ofphotoS}'11thesi$ of the plant whenthe lamp was 12 cm from It -(0,009 + 0.002) cmJ O2 min'"l ~ 0.011 cmJ ~min-J .,((A~.(1;IJi!:~~)

J

, I 1

.

The rate of photosynthesisdecreased ~..~,~..7:.. ..1. , I becausethe light intensity decreasedasthe distancebetweenthe plant and the lamp increased. I

Remove the sodium hydrogencarbonatesolution ...~Q~A~(:;..'$.t...>..> Put a vial of soda lime I sodium hydroxide solution into the syringe "1 Wrap thc syringe with black paper I aluminium foil " ..fl'?t1.{.( N~,b'f(..(). u(-f,(; III\.OI-/~:> 2.) . r ..ff'

2.(c) (i) (ii)

(W.t~\lf.Lv,,{,~If~f;"",

..",)'131)

'--I,..~

(2)

10 + 1 marks

~cgro~ h 0 t'mlcrootganjsms ..(11 t,"I'~ /l1l.-!.'\ .r /-v.( 1,Ii ["(J/",

TOI1UJI '."' bl([

>'

'~"J!,,1)o> c.'1:

I

Tota:I

II

0+. 1 mar.s k 1

.

(I) (2)

Wear gloves when bandllng the seafoodI usea clean knife to cut the seafood Display the sashimi at low temperatureI cover ,thesashimiQuring display. 'I ' horttlme.../.,.r, .11.' ( ..(11"""'<"""':",;'1/(. ' j.,-"'.J"'J.-""'~ I sash "Imlmust bld ~so WI'th mas ". .( ; .(., (accept othcr correct answers) !-.::.'"(, ", t,-, " C)(:' (1) In the caMing ptOC~ss, seafOodis s\lbject to hiih temperaturetrcatmcnt,

, .,

which kills the microorganisms present

,

Thereis no oxygcnin thc cans

,

,..

,

,

1 , rT+l l1J

: ,

ri"+J any W

, .':""

Thecansaresealed..:

"

:.~.;

~

:

;.~.:

so that further contamination of the food ISprevented

",~~

(2)

1

/

and this,will Inhibit the growth of microorganisms "

1 J )

,

two sets

n+1 W

Advolttage: seafood in cans'is more conveniently handledI transported IcanbestoredfQralongtlme 1 Dlsndv(ln(Qg~: canning may causeseafoodto lose its orieinal flavour I taste I texture 1 f f(."::i. ~ Tota}: 9 marks

2001.CE.BIQ1-4

.R ~I ~ 8m~ fJl1

FOR TEACHERS' USE ONLY

852-2602-0411

: :

P03 ..; ',FOR TEACHERS' USE172 ONLY

pur

YING COLLEGE

.R'R~8iJ.1JI

:.:~...:. ,t:. ::..':

:ioolCE

MAY,--. 29 '01 -.~08:27 ~~-

,

Biology raper 1 Marking Scheme

3.(a) (i)

(I)

Title (T) "."".,..,..,

Marks ,."

COlTcct labelling of axis (L).

~

.f~... ,..., , , ...,.. ."',:"':""""""."""""""."""""""", , ,., ,..!-i, '12 Vz Correct lotti~ of the bars (P : 2 bars correct, ~ mark; 3 bars, I mark: all 4 bars, 1VJmark.. 1'-1 ..If No mark irdata are not resentedin the fann of bar chart. ., p',. <.:/"l,.tx ( T =1>)

';~;~?:..:

,

..Distribution

o/stud6ntsw/th

different blood group"

-J (~: V'.; i"I~{';~((

/i1,f

f(ft"t-r;el

~ lJY"~t,f~ ens ~,,~ Number of

c. 4.( (..(.I.""'"~

studcnts

~ 0

.'~"~'. '. (ij),.

Ut'

!'The

W

r

.i~tl .:(Jf ,", J'

~t

~

~Jlele

(or

1 and ~ngue

2 ar~ tdngue.~oUers~ rol/mg

(h"""TO...,..t--.(.

,..(~

"'."l>":'.'~"""'.""""'."'.""."',."" _so each of them

mU$t carry

I

'r'

(

V

d;'i!l4'C.ffi~71""'..".'l>"'(~M.~.J...J.I;iN.fi...~.~..~1

from~~fherparents""":"""~"""".."'/':':""'I'""j)';~"".""."""""'".""""_."".,, v Thus a~~the.~arents 1$beteroZY,goUS "'~t~pt... .../lQfQ/1'¥J.:$tll'.~..l

I1

In a hetcrozygous condition, only the domInant~.I!~leJ$expressed Thus the allele for tongue rolling is domInant. .:... '" "."""..., :!1 I(111) They are non.tdentlcal ~,,-. . """ tWinS

:' ":::'".:.: ::. '.,", ,. ..."', "

of students

bttl. Vl.~

I.:: i. ~;;~t\. ~

AB

.

dtn;

.,-Student 2 is a rio~rolJer. $0she musthavereceived at leastone~~'~.for non~tongueroIlIng

~

I..u.: .{~

parents

at Jeast one

;L :1#SG~

.~;

A B BlOodgroup DisCOntinuousvariatiOrt""tJ...:

(2)

~'P11"1~

o.

V

.~

"" /\XL'
..M-

V

.:. '.c3,(b)

I J J..,..

becausetJteir9lQQa2rounsar~_di~limpIYingtbattheyaregenetjcallydi£ferent (i)

-"-The The digestcd barbecued products pork contains are ~~ecd fa~

.; '.

J

Total: II marks

II

{/:

into ~c ~

'."""""""" in the form of fat I oil droplets

"""".""""

.!: j:

.1

I;

.1

.r;

Effectivecomlnuni,"a~ion(C)

,: ,I ,I!

.,.

J

',/

..).(ii) The valvC$in vesselY~rp1o- preventth~1J~~fl9w o(the !vmDh '-""VV\..-

v --~

As the lymph vesselsare blocked, tissuefluid in the leg cannot be transported away Meanwhile it is !;.Q1!tinuouslv font1~ in the leg """"""'..""'.""".."" thus tissue fluid accumulates II"/J4Lf.c...r...1 ,.q..-"Xf/I'.111( The~~g~ tHatcausesSorethroat : stimulatestheprolifcration ofir.mphocytC,s/white blood cells in structure Z thus $tructure Z becomesenlargedk'l' i)t "'8 's .i'" />f.~11i. .-

.(/~~\.)... ;.. <.0.,tj;)! .

I1 I

!;

)

,.;

'.1 i i;

I I

:. .

i!

I':

.. "

.

:.:):(c) , (i)

(I)

0- Jt'r~;'.o/B~ ~ ~

*)Cvl~nl.

:~~.,...~

(2) content I no end wal.lsII The xylem vc$Sels in X cell wall

9 + 1 marks

,

1

~..Ada!'tati~11 IThis allows a free flow of water l'/~e.!'t (li<':~(1X) ;-f?~ . IS can pre en e co apse of } anyone set the x lem vessels 1+

I

..i

~,.;.: r'i I : ,.

(ii)

RcgionR

(iii)

(I)

""""

The support oft/Ie stem of plant B is mainly due to the turgidity of cells in regi~ thin-wall

cell$:

"'",.."

'i

I

'..

I

Under a hot and sunny condition, the rate of transpiration of the plant becomesgreater than the rate of water absorption .., d The cells in region S lose water "'."'""",.""" ...'.""J.' ~.., .1.~

.."'; ~;~,~ .'

:;',

fIi.i~)

.and hel1ce losc.tHeir turgidity/becomeflactid and thus CAUSingthe bcndJng of the steIn

.IIJ~../~S..t.I'fI~'./~.f!-l';<14'~.~...o:':' I (Itll\ , '1

J~

1 J

i i

I

I'; l'~

f:ffccllvecommlinlt:iltlon (C) (2)

:., .

1

i~

t

The support oftbe stem QfplantAis due to thepresenceof xylem/ independentof

-:/-o,~

~ ;'

"

thewatercontentoftbeplant..I.k'I.A-(J~..&n b~D\'3~ lJ,s "ylo:m CO'\\aln~~.~/.:r/lr7i./!t;A{;lJ'I.)AK,i.

~

:.. .7.""

""...'.." ..M..I:(~(I...

IJ ~,

Total; to + I marks

,J "

2001.,-C£-BIO 1-5

.R~~~a~.rJiV .-.,

Total:

fOR TEACHERS' USE ONlY :.;.~:

;,;..~~i/iJ~J",-",

c,'" , ,:,

-,"

4.(a) (i)

(1)

During exercise, a large amount of heat was generated / Heat was absorbed from the sun ……. 1 As a result, the arterioles in the skin dilated ……………………………………………………. 1 and the blood flow to the skin increased ……………………………………………………….. 1 thus the face became red Effective communication (C) 1

(2)

This helps to promote heat loss from the body ………………………………………………… 1 so as to maintain a constant body temperature ………………………………………………… 1

(ii)

There was a decrease in heat loss by evaporation …………………………………………………….. 1 Thus the rate of heat gain by his body became greater than the rate of heat loss …………………….. 1 resulting in an increase in his body temperature.

(iii)

Day 1 ……………………………………………………………………………………………….. 1 + The relative humidity of the afternoon of day 1 is the highest ……………………………………….. 1 and the wind speed is the lowest ………………………………………………………………………. 1 Total : 10 + 1 marks

4.(b) (i)

Rate of breathing = 12 breaths per minute ……………………………………………………………. 1 Depth of breathing = 500 cm3 …………………………………………………………………………. 1

(ii)

between 0 and 2.5 second …………………………………………………………………………….. 1

(iii)

Intercostal muscles relaxed, so that the ribs moved downward and inward ………………………….. Diaphragm muscles relaxed, so that the diaphragm recoiled to the dome-shape …………………….. The thoracic / lung volume decreased ………………………………………………………………… leading to an increase in air pressure in the lungs …………………………………………………….. Effective communication (C)

(iv)

1 1 1 1

1

(1)

The breathing movements would become faster ………………………………………………. 1

(2)

In the left lung, air flow would decrease ……………………………………………………….. 1 In the right lung, air flow would increase ………………………………………………………. 1 Total : 10 + 1 marks

4.(c) (i)

Presence of insect guide Large petals Stigma / anthers lie within the flower Broad / club-shaped stigma

) ) ) any two ……………………………………….. 1, 1 )

(ii)

(1) (2)

*pollen tube …………………………………………………………………………………….. 1 It carries the male gamete ……………………………………………………………………… 1 to meet the female gamete in the ovule ………………………………………………………… 1

(iii)

C will develop into the seed ………………………………………………………………………… 1 + which will form a new plant …………………………………………………………………………… 1 B will develop into the fruit ………………………………………………………………………… 1 + which serves to protect the seeds ……………………………………………………………………… 1 and helps in seed dispersal ……………………………………………………………………………. 1 Total : 10 marks

2001-CE-BIO 1–6