1986 Biology Paper I Marking Scheme

8/4/2019 1986 Biology Paper I Marking Scheme

1/10

.;~------~----Harks

1 or 0H)metamorphosis (do not accept "incomplete metamorphosis") 1: : : : : : ; / : = : - : - y - D

~~i k ~ . \ . ~ - { ( \ , P , { . ! ~ ' ) ; . ~ - ; \ ~ 1 8 ~ ~ .(iH) avoid competition with the larval stages /I .exvlore ~w sources of food etc. / promote dispersal It '" 'V,~-./ J L I~!;) I h - v - . \ ( s(iv) fee~s on harrJIfu1.nsects / provides food for man 1 or 0

11

(v) (1) sucks blood / transmits parasite / vector of disease /bites human skin _'"..... 1s pr ay i ns ec ti ci de scover exposed water surfacespray oil on stagnant water surfacekeep fish/frog in pond etc. to eah the larvaeor any other reasonab~e methods ( I'A a i / ~ 1 e )

i

\ t G r ~ ~~! ~~r~using correct axes as shown

(2)

(b) (L)plotting 8 correct points for 1 curve

anyTWO1, 1

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8

1 A1 r1 p~. * r.1 L

joining points tcge the r on' ~ ach curveplotting 8 correct po:i.ntsfor the other curve. . . . . . . . . . . . . . . . . . . . . . . . . . . .labelling one or both curves ......................................

16 Lengths of co lco ptilc an d rad icle v s co ncen tratio n of a ux in s ol ut io n~J! ' - 1 ' . : It 1 r ~ - - I " I ' _ ~ , . 1 ' : -t : , !! t, l~:" I i .1 t : r t ~ - i 1 ; ; : ; : ~ : ; IL L r L . . j r . i. . - r l 1 ' . 1 1 ii . + I I I ' 'I " t \ 1 ~ , I' '.'I. I"!' I ! ' "i ' 1 - 1 ' t'1 f L ' I - ~ .Lt r 1 1 " " 'I~I tt', '-: . : ' - " f - ~ r L ' . . 'i-r1~.:L.~ 1-' 1 , 1 . . t , '~.i.II+. 1 - " II'-! 1-- 1 . ~ . - !. t . : . . . l . l l- i l . . . 1 . : r ' . l , :+ H J - . J j : + I - t 5 : . 1 . ' . ' 1 ' : ,: j, l! 1 1 j ' i -1 , . i ~1 , : ; i i-il ; l - . . , l - l _ ! x' t -1 ._lP + -: . ;" . '~ , t, ~ ,-;~

13 -, i T ' . ; . t . r T \ ( - t l : n V i t t t - T ~~ll:TI ~ !" 1 ~ r ~ { i \ t . ~ r . - l T :. : ; : ; i ::-:-:.L t. + I t t L : r l :1t r ~ +:I~L'[:.-J,'~:I ;tj! l :T_:0; i I I I " 1 ' . :I~.;- ~ : _ \ _ ; ' 1 , 1 t T 4 . ~ j ' j " "1 ' 1 . '1 ' ,t ,,', \" co eopu e ':'';::.1'1..' 1 . . ' . . 1 ' - . 1 1 . - . tl' ' r r t .-tjtltjT\-~ \ "':,' :., 1 " ; ~11IL'it , \ 'L '-l;A. ItIr1r 'I'~III ';'1 :IIII J~ 1 4 .4 m t > - : : : ! h t f I J ; - F - t 0 ~ ~ { : \ : 8 i~ + F l f r H r ~ t H T ~ . ~ t~T';-~: j . .L . L , : " . " ! . l l t1xtl-,X't. r L ' ; J i!.l:j' l ~ d ~-i;\; I r i ~: I I ~ .;o " i f . J ; - . c' , 1 :'1 ' I '1 L ~ ' I l t l . . . j11. " I . \ ~ i . ~ ; J'll ' - 1 ' L! ~i 1 \ ' ; : i : ' : i . : :~ r"'\\ . ,[ .. II " t . i., , < ; . _ ~ , . . , I~, ... 1 '. . . " ' l i ' ; ' ' ' ; I D ' ~ - . l G > ~ ni-!d-'T' ,~. I~' r ; . j I ,... ,., ... , . ,~ . J " , T 1 1 : i.~. rj.~'~~.':ltl 'I , ! 1 1 . 1 11 . : ) " 1 1 t - i , I ! 1 1 I I!:i i~.I !'" 13 .. 1 _b_w. . +tt ,L' 1 .. ~.L_",~ ..L.- t- ; ,- . . . . .--t- ----.--".:-,' il: 1 1 " [ ; ' . \ ' - i L j f ; . ( . . \ . .f 1 t , r i ' f \ ' , u: i: ~ I i : 1 i; 1 1 [ 1 i i ';: ;,! .: .: '1 I . , ~ . i .' I I" t , 1 . ' 1 ' l... ~"...j' I" I . . \ I . t I ' ,,:: .:,':ll: I' "~I.'+ . -,'",.,.[ .,1.1. i . : , . . . . " , . , ; . ,'-' U \'!I-Il~t..i1 JJ-'I:t' ,L.'I.Lh It;;! .:i:l:i~ ; ! : . 1\ i:!::' : 1'- 5 I' I' ' 1 " I . . ,Ii I I 'I " .. I . I. ,:~ , 'lG; ,-'; ,:.11: ,'1 'I I} 11 II, I" I!' I" il:'" I i I

'-Q _ I . S L ' :.:.~ : . .. . ~ :~ radicle L _ ~ _.~ ~ _ ~ _ ~ . J . _ . ~ _ L i.l_ .~_,2 _t~~. l.~_::-:'"~ 12 -l ..',[, . :. ,.\:~. " ' I " I ' _ : I' tll ... 1 , . \ , . : ,f I., \. , .. ,, ; . , ' . ; . 1 1 ; . 1 ; '1" I' .. ,. 1 1 ', . . 1 ' ' .. : I' i''':''': I i:,I ..:I...~, ) 1 \ . . 1 :. 1 " ,,1!I;'1. ~':!"! _. , .. , ..I I I ' I' ,. ''1{L'I I'';''' i'''' . I... I I . ,., .. \ .... , ' l i ' I : . ' . . I ' 1 TII " ' 1 ' " ' - " " 1 1 i : , 1 " i " I " , ",~i:;"r , . , " . . , . . I I" I_t' i. I ' i . , . , 1 .1 : '1:';" ," ,.' ....,! , I !.' I l :I ;.I . _j. . t. . ~ -.. t .. I .,' I . : ., ., I':. ,1. ,'1 ';,1",1, , .. t,;,I .. ,~,.,I" .. , ; .. !I , ; I. I.:., -I i I, 0. L f I {! t 1 ' I I : .. , ~; j I t ! . ,II : - ~ : ; - ~ t r + : -_ j , ~ 1 1 1 , ' : t t T ~ - - - : T T ~ ' : ~ - : - : i ' : T - : ~ ~ : ; ~ ' :

:~,!\l' I !: -: 1 J ;~ I ! I , I : . . ! I.j 1 : t : : ' j .: : ': .: : : : '"tlit i i" ,~.Iil:illI':l!il., l i , ! . i t . , 'ii .":,," " . : ' l W J ' ':"I''-''';U'' ,- .i, '.,.", .. ,! .. ',::. r.: , .. '."'.t - I "1 1 . . '. rr r: \""'.'~"I.' :.(~,".. " i i: I,. :. i: t!,l ;-;! r- i I:' ILl~ iL, ;ll'~' I : I ' I I! i j' l' :' ....; ! \ , 1 I.I\ ,I;; I . I,: i' I',:,---":>----e--~ ~'). :10 1,., . ~ I.' ".' '.---.-- ~-

10-6 ~ ;;;- :l 10 '4 10-3. I~'l 10'1 I 101 10l 103Couccutrution of auxin sciution (ppm)

Concentration of auxin Lengths (nun) after two dayssolution (ppm) radicle tips coleoptile Iips

10'" 12.3 12.210'" 13,5 12.210" 12.5 12510'" 11.1 13.310'" 10.6 13.910-1 10.4 15.11 10.1 15.7101 10.1 14.6102 10.1 13.310' 10.1 11.3


2/10

(iii)

(iv)

(c) (1.)

(ii)(iii)(iv)(v)(vI)

(1) 1 / 101 / 102 / 103, Hm .... 1(any concentration within this range)(2) 1 ~ ~:L\.~~:~\(t"L t~ :t . 1(1) resulting in equal elongation in coleoptile and.radicle -4(as auxin concentration increases beyond 10 ppm,coleoptile elongates more while radicle elongatesless) ..... 1(2) resulting in different elongations in coleoptileand radicle / less inhibitory on coleoptile /coleoptile elongates more(inhibitory effect on both)

the Ugh t source ( ~ A ~ A A . I . :$~; .- be nds towar dsauxin on agar block diffused down the coleoptile ..........

- . ,auxin was redistributed or inhibited by light Imore auxin on the shaded side 1resulting in greater elongation on the shaded side .......

B - no bending 1no auxin supply I'

avoid accumulation of waste /prevent growth of bacteria /keep the farm cleaner 1sedimentation I filtration ...................................as fertili zer ................................................SUPPIYlxygen /or the bac;'1~i~l action / for oxidation

< ()0 " - c . ho . . c ! 9/ (o-;decamp sition o~~rgani~ m tter / respiration of bacteria l.n crea se in or gani c matt er/s uspe nded soli ds/b acte ria conte ntdecrease in oxygen contentl.ncrease in t~rbidity / decrease in light penetrationincrease in foul smellor any other reasonable effectsr NOT simp ly poll ution ]

RESTRICTED ptjgB"f i :

1

11

1

15

\/\1111

anyTW O1, 1

7


3/10

(iii)(iv)

(b) (1)

(li)

,H...i~i. J I' ; j . < > IIA - -~ O l ' t " &~ \p\\\l:i5C('\(than A (A is acidic, F ~a~aline)

111 or 11

6

p ho to sy nt he si s 1r es pi ra ti on ~ .. . 1,.i

_ negative oxygen production I oxygen consumed 1_ zero light intensity I darkness 1_ no ph otos ynth esis I oxygen not produced 1_ oxygen consumed in respiration 1

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

pH value of F higherbile ................ II II .. '.

_ 02 output balance input I no net change 11

(iU) (1) pale green or yellow (do not accept white) 1

emulsify oil ~ Ch~ange/\~i1~n~R Oi1(droPjl;ts1 ' ,' _.. .; '" ' D . c ' o J ' . . /' 1 . . . 1 . - I f ) /r~ ~ ~ I~P\ X } /> ~ ~~, /A , _ B . .! .. . f, D l..:~: . ~ ' ) . , - - . ~ . " ~ : c ; p . .

(1) amino acids { O . b ; 1 ; . . t ( ( . ) iJ . .(2 ) deamination (urea production) II

(2 ) chlorophyll I chloroplasts 1

(iv) less oxygen is produced in Y 1bec ause less chlo roph yll I chloroplast 1lower the photosynthetic rate ~ 1(or vice versa for X)

at point A

at point B :

_ rate of photosynthesis = rate of respirationB is the compensation point } any ONE

13

1~.!.


4/10

(0

(:U)

Marks-There is bacterial growth / multiplication ....................

.1nhi bitio n of b acter ial explanation

growthonly X i s e ff ec ti ve I I X is more specific fory is not effective / this bacterium / thisbacterium is moreX is more effective than Y susceptlb,le to X Ithis bacterium iskilled by X

(ili) i kill thi ba t ri !I ) 'I II/t,t / ) . 1 ( ' ( ( i f ' . . o C t ( ( ~ 1v negar can Bee urn I~ r : . ~ ~"\i O J VJ..... ..! .. . . ..~/

li,

Gl\ 2')

(iv) at o D e bacteria not active 140C is favourable for bacterial growth 1(v)

(vi)

, - \ ;

1 pickling of food / putting food in vinegar plate DI refrigeration I keepin8' ~,~odat a 1... temperatureI add Lng antibiotics

plate EIplat:e BI

contamination . . . . . . . . . . . . . . . . . . . . , .;\1\. . t : . ~

\ - + (J\+ \\t 0O~Oo - t 0

/ 0"/ ./V ) , , "

Io VI1,/ \ \ C - - ). , , - " .. . . _ . _ . _ - - - _ . ....:---

\\

1

1 + 1

any TWO1 ,+ 11 + 1

1

11


5/10

t" .._ , .

J6 CF. B io. IP.10. . , HarksC j Har.king Scheme

(c) (1) G-F-E-C-AI ~" / 1 . 1 ) . : , ", ""'.- / I ;: / T \ ' , .I -.' . \ I ," .I 2 or 0

c _'r ' : 0 ' : . . J . ~ , .( I ,) l' " I ') (f . r " ' ",,~ . . \ . ..~ ~J \..; ,

1(ii) (1)(2) A 1

(iii) B - transmit impulse to and from muscles and brain Icontrol rate of breathing and heart beat ................. 1H - detecting orientation I receiving s'timuli ................ 1' [ N O T maintain balan6e]J - muscular co-ordination I giving response ................. 1

7.{l

, '\

................ ~. _ _ __ ... _.... ._1' .......... ......N.-. r . . . . . ..


6/10

5. (a) (L)

P.9Harks

(1) transpiration (water loss) ) absorption (water gain) 1cells plasmolysed / tissue become flaccid /turgidity lost ........................ '............ '.. 1

(2) labels: cell wallcell membranenucleuscytoplasmvacuolechloroplast

showing plasmolysis

any FOUR 4 x ~ *correct spelling......................... 1ccuracy

(3) X shows no bending while Y shows bending ................ 1(4) xylem / vascular / strengthening /woody ti ss ues le ss in Y (or~ in X) .................. 1

(ii)

(b) (L)

(1)(2 )

cells .I processesf .1root hair(~e)(?~t( r"lLosmoSiS I/ diffusion,xylem transpiration / capillarity /root pressure --mesophyll cells osmosis / diffusion

1, 1

1, 1(3) 1, 1

13

(1) the genotype of the parent is Tt / heterozygous 1because dwarf plants (tt) are produced 1

(2) parents (P)J ~ ~1 (I n II - 1 , \ _ ) gametes G)I I ~ '"

(Ll)

1 or 01 or 0

ratio is 1 11 ...........(3) 1warf plants : 53 .. > " ~ ' : r ~ ~ .~{{~,i"""''''''''''''

150 ~ 1all plants :

due to environmental effect 1.................................I........ '" . 1iii) test-cross with dwarf plant (tt)

trw individual I2roducing only tall plants is homozygous (TT) 110


7/10

.~....irking Sche me..

(c) (1)

(11)

(iii)

(iv)

!~;~:::rR I C T f E D p " t j ~ B : 5 t4* Harks2+to prevent the formation of blood clot/to remove ea ions 1

bursting of R BC I haemolysis occurs 1.........................cell contents released 1......................................because the water potentia} f,Jf fistJJ .le!!wa~er )f;. If (V \greater than that of R B C I . ~ ~ t f ~ ~ " " " - . . 1 ' . ~ ~ . ( . . . . . ; ~ . . . (. \ .J. 1 ' 1;,t~_C "VI ( 0,- { I 'D-, C . e {\/t-C. e r G . - , , :there is a net flow / osmosis 0 water into the REC 1haemoglobin ..................................................REC / blood cells 1...........................................(2) pulmonary artery ............... _ / * . . . . . . . . . . . . . . 1

II ...(v) (1) pulmonary vein ......... ~....................... 1

9


8/10

(ii)

(iii)

(iv)

(v)

(vi)(vii)

(b) (i)(ii)(iii)(Lv)

(v)

Marks

by active movement / movement of its tail .................... 1by passive movement / ciliary action /muscular contraction of oviduct 1.............................

any ONE ........ 1(l) mitosis ................................................. 1(2) maintain / preserve the chromosome number constant 1thickened / blood vessels increased[ pla ce nt a f or ma ti on N OT a cc ep tab le ] ........................... 1placenta ......... " . 1(1) reduces friction / lubricates passage ................... 1(2) expels foetus by contraction ............................ 1

9

to take all readings at the same (atmospheric) pressure 1atmospheric pressure / temperature ........................... 1respiration / oxidation of food 1.............................decrease . e o oxygen absorbed / consuwed by seeds carbon dioxide liberated from seeds potassium hydroxide solution absorbed the carbon dioxideliberated ~

111111oxygen has been completely used up only anaerobic respiration takes place potassium hydroxide solution absorbed the carbon dioxideproduced ............................... 1

(vi) use sterilized dead seeds I dry seeds I boiled seeds / no seedsin similar apparatus 1(vii) to prevent photosynthesis 1

12


9/10

(ii)

spot colour explanation

A blue-black /dark blue

1 + 1starch is present

B 1 + 1+ 1- starch has been, digestedby amylase I enzyme inuntreated x l I(1)(2)(3)

enzyme inhibited / inactivated by acid .................. 1fresh extract from germinating seeds contains enzymes ,I i . . - ( } , ' ~ ~ (v)enzyme denatured by boiling f \-1 ," i J ~ ~ .

11

(iii) (1) saliva ................................... 1

(1)

(2) amylase / ptyalin ....................................... 110

valves 1 II " -.(ii) vein ................................................ 1(iii.) movement of finger B pushed blood away from this segment 1

valves at Q prevent blood to flow back 1......................finger A stops blood flowing into P 1

(iv) (I) stop or slow down the blood flow, for the moment Imake the vein more conspicuous Iachieve a more obvious result 1(2) to allow normal blood flow in the arm again 1

7

----'1------,., _'--------


10/10

hemc

photosynthcsis . . . . . . . . . . . . . . ' , I i ) ' wi~'~ ~ Z ~j'.~;.~: .!t ...,Xl?.;>' ~ ( tt " c- f-It---23400 kJ - (1486 0 + 3500 + 306 0)kJ or 23400 kJ - 21420 kJ .=. 1980 kJ .............................the difference is the energy used for respiration I activity Igrowth I storage in the remains of grass ...

(Hi) man

(iv), .l / '1 -I. 'I0 ~ 1/

-I t

\ .:

d entf.t Lonf t I. c J \': !\,;~t \",_\', ", . ,,)

J ,1 I '\ ~

alimentarycanal

.........................................................." '

a da pt iv e f ea tu re explanation

teeth 'with open roots I, continuous growth. , .II to compensate wea ring

incisor with sharp edge /chisel shape for cutting gra~s

presence of diastema provide space forholding ~rass whilechevtng

" \rid~es in molar for grinding! _-_._,.- ".~

very long small intestine allow longer time fordigesting plant tissues ,

long I large caecum can retain more planttissues

accommodation ofsymbiotic bacteria for digestingcellulose

(v) dead bodies I organic waste matter will be accumulaterl Ino decomposition

!i

materials will not be recycledless grass and animals can survive

1

11

1

1

anyTWOpairs1 + 11 + 1

anyONEpair1 + 1

any TWOI, 1

13

1986 Biology Paper I Marking Scheme

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