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UNIVERSITYOFCAMBRIDGEINTERNATIONALEXAMINATIONS

InternationalGeneral ofSecondaryEducation

*

BIOLOGY 0610/62

Paper6AlternativetoPractical October/November20111hour

CandidatesanswerontheQuestionPaperAdditionalMaterials: ruler

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ForExaminer'sUse

1

2

3

Total

This consistsof8printedpages.

IB1111_0610_62/6RP

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PAGE

2

1 Fig.1.1showsalongitudinalsectionthroughabutternutsquash,Cucurbitamoschata

Thiswholestructureisafruit.

For

iner's

Fig.1.1

Makealarge,labelleddiagramofthefruittoshow

thearrangementoftheseeds

thethicknessofthefruitwall.

[5]

PAGE

3

Fig.1.2showstwoseedsfromthisfruit.

For

iner's

Fig.1.2

Describetheexternalappearanceofthisseed.

[2]

Fig.1.3showsaseedlingwhichhasgrownfromaseedtakenfromthisfruit.

For

iner's

testa

soilline

Fig.1.3

CompletethelabellingoftheseedlingonFig.1.3.

Thetesta(seedcoat)ofthisseedlinghasbeenlabelledforyou. [2]

Theinternalcontentsoftheseedwillcontainanembryoandstoredfoodmaterialsforgermination.

Describehowyoucouldcarryoutfoodtestsontheinternalstructureoftheseedtoshowiftheseedcontainedfatorstarch.

fat

starch

Describehowyouwouldgerminatetheseseeds.Includetheenvironmentalconditionsrequired.

[4]

[4]

[Total:17]

PAGE

5

2 Aninvestigationwascarriedouttofindtheeffectofsalt(sodiumchloride)solutipotatotissue.

Alargepotatowascutintolongthinstrips,calledchips.Eachchipmeasured60mminlength.

Onechipwascedinaconcentratedsaltsolutionandanotherchipwascedindistilledwater.

Afterthreehoursthesechipswereremovedfromtheliquids.ThechipsareshowninFig.2.1.

For

iner's

saltsolution distilledwater

Fig.2.1

(i) MeasurethelengthofthechipsinFig.2.1.Calculateanychangeinlength.

RecordyourmeasurementsinTable2.1.

Table2.1

chipinsaltsolution

chipindistilledwater

length/mm

change/mm

[2]

(ii)Ex inthechangesthatyouhaverecordedforthesetwochips.

For

iner's

[4]

Asimilarinvestigationwascarriedoutbyagroupofstudents.

Theymeasuredthemassoffivechipsbeforeputtingeachchipinadifferentconcentrationofsucrosesolution.

Thechipswereleftinthesolutionfortwohours.

Aftertwohourseachchipwasremovedfromthesucrosesolutionanditsmassmeasured.

TheirresultsareshowninTable2.2.

Table2.2

concentrationofsucrosesolution

/gdm3

massatstart

/g

massafter2hours

/g

differenceinmass

/g

percentagechange

0.0

1.36

1.49

+0.13

+9.56

35.0

1.41

1.48

+0.07

+4.96

70.0

1.46

1.47

+0.01

+0.68

175.0

1.47

1.38

0.09

6.12

345.0

1.45

1.31

0.14

…………….

CompleteTable2.2bycalculatingthepercentagechangeinmassfortheconcentratedsolution.Showyourworking.

For

iner's

[1]

Suggestwhyitisnecessarytocalculatethepercentagechangeinmasswhencomparingthechips.

[1]

Plotagraphtoshowthepercentagechangeinmassagainsttheconcentrationofthesucrosesolution.Usethegridandaxesprovided.

percentagechangeinmass

concentrationofsucrosesolution/gdm–3

[4]

(i) Useyourgraphtofindtheconcentrationofsucrosesolutioninwhichthemassofchipwouldstaythesame.

gdm3 [1]

(ii)Exinwhythemassofachipinthissolutionwouldstaythesame.

[1]

[Total:14]

PAGE

8

3 Fig.3.1showsthreeanimalsA,BandCwhichbelongtothesamegroupofarthropo

For

iner's

A

Nottoscale

B C

Fig.3.1

(i) Listthreevisiblefeatures,otherthansize,whichareusedtoclassifythemallinthesamegroupofarthropods.

1

2

3 [3]

Giveonevisibledifference,otherthansize,betweenanimal,

AandB

AandC . [2]

Namethegroupofarthropodstowhichthesethreeanimalsbelong.

[1]

Nameoneothergroupofarthropodsanddescribehowthisgroupdiffersfromtheoneyouhavenamedin(a)(iii).

groupofarthropodsdifference1

difference2 [3]

[Total:9]

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