2023 TYS Answers (ThatBioTutor).docx

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor. Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:) TYSAnswers2023(ThatBioTutorEdition) IMPTNOTE:- fordifferencesbetween2023and2024syllabus,seethislisthere.- *Shadedblack=outofsyllabusfrom2024onwards Question Ans Question Ans1 D 21 B2 B 22 D3 C 23 D4 C 24 D5 D 25 A6 B 26 C7 B 27 B8 D 28 A9 B 29 C10 D 30 D11 A 31 A12 A 32* A13 A 33* B14 C 34 B15 C 35 D16 C 36 C17 C 37 B18 D 38 A19 B 39 A20 A 40 D

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor. Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:)Paper2randomanswers:(notcheckedyetbyTBT)-https://drive.google.com/file/d/1qmuJdhwSS1dXvbPPMgsGES5SbCvZlbRY/view?usp=drive_link Q1 a) ● X–pulmonaryartery● Y–rightventricle● Z–tricuspidvalve b) ● Duringventricularsystole,musclesofY,therightventricle,contract.● Asbloodpressureinrightventricleincreasesabovethatoftherightatrium,● CausingZ,thetricuspidvalvetoclose,preventingbackflowofbloodintotherightatrium.● Bloodpressureinrightventricleincreasesabovethatofthepulmonaryartery,pulmonarysemi-lunarvalveisforcedopen,bloodissenttothelungsviathepulmonaryartery. c) ● BloodispumpedfromY,therightventricle,tothelungsviathepulmonaryartery.● Bloodthenreturnstotheleftatriumviathepulmonaryvein,thenenterstheleftventricle,● Andispumpedouttheaortatotherestofthebody.Bloodentersthekidneysviatherenalarteries,● thenbranchesouttoafferentarteriolesofnephrons,enterstheglomeruli,thenefferentarterioles,thenbranchesintobloodcapillaries.

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor. Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:)Q2 ai)Any2points: ● Theyhavethesamelength● Theyhavethesamecentromereposition● Theyhavethesamegeneloci● aii) ● Bodycellsarediploid,hencechromosomeswillbefoundinhomologouspairs● Gametesarehaploid,homologouschromosomeswouldhaveseparatedduringMeiosisI,reductiondivision,hencegametesonlyhaveonecopyofeachchromosome. aiii) Outofsyllabus. b)

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor. Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:)Q3 ai) ● Toreleaseenergythroughaerobicrespiration,● Forcellularactivitiessuchascellgrowth/repair aii) ● Carbondioxide● Water bi) ● Ascelldiameterincreasesfrom10to80µm,meannumberofmitochondriapercellincreasesfrom80to700. bii) Plantcellwithgreaterdensityofmitochondria: ● (choose1)roothaircells/companioncells Reason:(choose1) ● Roothaircells-toreleasealotofenergyviaaerobicrespirationforactivetransportofmineralsaltsfromaregionoflowerconcentrationinthesoiltoaregionofhigherconcentrationintheirlargecentralvacuoles● Companioncells-Toreleasealotofenergyviaaerobicrespirationneededforsievetubeelementstotransportmanufacturedfoodsubstancesduringtranslocationasactivetransportisinvolved Plantcellwithlessdensityofmitochondria:(choose1)Sievetubeelements/Xylemvesselelements Reason:(choose1) ● Sievetubeelements-containnomitochondriatohavemorespaceinthecell,toallo