8d_ut3_bio_2012

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IGCSE UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS MethodistHigh School

CLASS VIII D UNIT TEST 3 BIOLOGY [30 Cambridge

Check!i"# SCIENCE $age ! !% "

READ THESE INSTRUCTIONS FIRST:

• Answer all questions in the writing sheets provided. Write in dark blue or black pen.

• You may use a soft pencil for any diagrams, graphs or rough working.

• Do not use staples, paper clips, highlighters, glue or correction fluid.

• The number of marks is given in brackets ! at the end of each question or part question.

• This document consists of " printed pages.

Q.1 Sailors used to suffer from an illness alled sur!" aused #"

a $oor diet on lon% &ourne"s. 'ames (ind )as a dotor )*otested treatments for sur!". He $redited t*at all aids ure

sur!".

He %a!e + $airs of sailors )it* sur!" e,atl" t*e same meals #ut *e also %a!e ea* $air a different addition to t*eir diet.

-a Does t*e e!idene in t*e ta#le su$$ort t*e $redition t*at all aids ure sur!"/ 023

Ti4 t*e orret ans)er. 05es 6 No3 Use t*e ta#le to e,$lain "our ans)er.

-#-i 7i!e t*e one fator 'ames (ind *an%ed in t*is e,$eriment. -t*e inde$endent !aria#le 013

-ii 7i!e t*e fator 'ames (ind e,amined in t*is e,$eriment. -t*e de$endent !aria#le 013

- 'ames (ind8s e!idene su%%ested t*at oran%es and lemons ured sur!". At a later time9 013

ot*er sientists did t*e follo)in%: T*e" se$arated itri aid from t*e fruit. T*e" $redited t*at itri aid )ould ure sur!".

T*e" tested t*eir $redition #" %i!in% $ure itri aid as an addition to t*e diet of sailors)it* sur!".

T*e" found it did not ure sur!". T*e sientists *ad to ma4e a different $redition.Su%%est a ne) $redition a#out a ure for sur!" t*at is onsistent )it* t*e e!idene olleted.

-d E,$lain )*" it is neessar" to in!esti%ate t*e effets of *an%es in diet o!er a $eriod of 013

more t*an one )ee4.

Q.; T*e ta#le #elo) s*o)s t*e mass of si, nutrients in 1<< m= of t*ree t"$es of mil4.

-a A sientist om$ared t*e t*ree t"$es of mil4. >*" )as it a fair om$arison/ 013

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Check!i"# SCIENCE $age # !% "-# ?ot* *uman mil4 and mil4 made from #a#"@mil4 $o)der ontain more su%ar t*an 013

o)s8 mil4. >*i* data in t*e ta#le su$$orts t*is/- >*" do )e need alium in our diet/ 013

-d-i ?a#"@mil4 $o)der is made from o)s8 mil4. >*at e!idene is t*ere in t*e ta#le t*at iron 013

is added )*en ma4in% #a#"@mil4 $o)der/-ii >*" do )e need iron in our diet/ 013

-e A $u$il said9 T*ere is more !itamin C t*an $rotein in *uman mil4. Ho) an "ou tell from 013

t*e ta#le t*at t*e $u$il )as )ron%/

Q.= T*e dia%ram s*o)s t*e sta%es in testin% a %reen leaf for star*.

-a T*e sta%es are not in t*e orret order. Blae t*e letters of t*e sta%es in t*e orret order #" 013

)ritin% t*e letters in t*e #o,es. T*e last sta%e *as #een om$leted for "ou.

-# 7i!e t*e reason for ea* of t*e follo)in% sta%es: 0121213-i sta%e C

-ii sta%e ?

-iii sta%e E

- (oo4 at t*ese t)o reations )*i* ta4e $lae in li!in% or%anisms.

>*i* of t*e t)o reations

-i ta4es $lae in $lants and animals/ 03-ii ta4es $lae onl" in $lants/ 03

-d >*i* reation re$resents $*otos"nt*esis/ 03

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Check!i"# SCIENCE $age 3 !% "-e Name one su#stane used u$ in reation A/ 03-f >*i* of t*e t)o reations an onl" ta4e $lae in da"li%*t/ 03-% 7i!e a reason for "our ans)er. 03

-* >*at is t*e soure of t*e )ater in reation ?/ 03-i >*at is t*e soure of t*e %luose in reation A/ 03

Q. A $lant alled Himala"an #alsam $rodues seed $ods. T*ese $ods e,$lode and t*e seeds s*oot outin all diretions.

-a Carlos finds 1 seeds on t*e %round around a Himala"an #alsam $lant. He measures t*e distaneof ea* seed from t*e $lant. T*e ta#le s*o)s *is results.

-i Dra) a *isto%ram to dis$la" t*ese results. 0;3

-ii Ho) man" seeds tra!elled more t*an ;<< m/ 013

-# Alt*ou%* t*e seeds s*ot out in all diretions9 t*e" )ere not s$read e!enl" around t*e $lant. 023

T*e dia%ram s*o)s )*ere Carlos finds t*eseeds around t*e $lant.

Carlos t*in4s t*at more seeds are in t*e nort*@east setion #eause t*e )ind #le) from t*e

sout*@)est. He )ants to find more e!idene

to deide if *is e,$lanation mi%*t #e orret.

>*i* t)o $iees of e!idene )ould su$$ort

*is e,$lanation/A : T*ere are al)a"s more seeds lose to

t*e $lant t*an furt*er a)a".

? : >*en t*e )ind #lo)s from t*e sout*@

east9 t*e smallest num#er of seeds isfound in t*e sout*@east setion.

C : >*en t*ere is no )ind9 t*e seeds are

found in eual num#ers in ea*setion.

- T*e s$readin% of seeds a)a" from t*e $arent $lant is alled dis$ersal. 01213

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8d_ut3_bio_2012

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