2022 TYS Answers (ThatBioTutor).docx

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor. Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:) TYSAnswers2022(ThatBioTutorEdition) IMPTNOTE:- Fordifferencesbetween2023and2024syllabus,seethislisthere.- *Shadedblack=outofsyllabusfrom2024onwards Question Ans Question Ans1 D 21 B2 B 22 B3 D 23 A4 B 24 C5 C 25 D6 B 26 B7 C 27 D8 D 28 D9 A 29 B10 D 30 A11 B 31* B12 B 32 B13 C 33 D14 D 34 C15 D 35 C16 D 36 A17 A 37 D18* C 38 B19 A 39 A20 D 40* A Stillwantmore?www.thatbiotutor.com-www.instagram.com/thatbiotutor/-www.youtube.com/@thatbiotutor-www.tiktok.com/@thatbiotutor

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor. Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:) Q1. (a)● Redbloodcellsarebiconcave,increasingitssurfaceareatovolumeratioforfasterdiffusionofoxygeninandoutofthecell.● Itlacksanucleus,makingspaceformorehaemoglobintobepackedin,increasingitscapacityforoxygentransport.● Itisflexible,soitcansqueezethroughtinycapillariesinordertoreachthetissuesthatitneedstodeliveroxygento. (b)(i) ● 91%islowerthanthehealthyrangeof95-100%,sothepersonlacksbloodoxygen.● Walkingupstairsrequiresenergyformuscularcontractions,whichisgeneratedviaaerobicrespiration,whichusesoxygen.● Thepersonmayfeelmoreexhaustedthanahealthyperson,andmayfeeloutofbreath. (ii)● Pulmonaryvein.● Itcontainsbloodthathasjustpassedthroughthelungs,atwhichitreceivedoxygenfromalveolarairspacesandhaditscarbondioxideremoved. (c)● Carbondioxide:Transportedtolungstobeexcretedduringexhalation.● Whitebloodcells/Lymphcytes/Phagocytes/Antibodies:circulateinbloodprovidingdefenceagainstdisease Stillwantmore?www.thatbiotutor.com-www.instagram.com/thatbiotutor/-www.youtube.com/@thatbiotutor-www.tiktok.com/@thatbiotutor

Credit:WrittenbythecollectiveeffortofourtutorsatThatBioTutor. Youarewelcometosharethesewithanyoneyou’dlike!Justdon’tsellthemforprofit:) Q2. (a)(i) ● Palisademesophyllcell. (ii)● Thelargecentralvacuole. (iii)● Nucleus/Mitochondria/Roughendoplasmicreticulum/Smoothendoplasmicreticulum/Ribosome/Golgibody.o *Reject:Centrioles(onlyfoundinanimalcells!) (b)● Afterawhile,mostofthechloroplastswillbefoundnearthetopofeachoftheleafcells.● Theywouldhavemigratedtowardsthetop,togetneartothelightsourcetoreceivemorelight,● Somorelightenergyisabsorbedbychlorophyllwithinthem,andconvertedtochemicalenergyforahigherrateofphotosynthesis. (c) *Compare=SimilaritiesORDifferences Any3:● Waterentersthecellviaosmosis,whilecarbondioxideentersviadiffusion.● Watermovesdownawaterpotentialgradient,whilecarbondioxidemovesdownitsconcentrationgradient. ● Bothsubstancesmovefromaregionwherethereisahigherproportionofthemtoaregionwherethereisalowerproportionofthem. ● Bothsubstancespassthroughthepartiallypermeableplasmamembranewhenenteringthecytoplasm.● Bothsubstancesmovewithouttheuseofenergy,asdiffusionandosmosisarepassiveprocesses.o *Reject:Bothmovedownaconcentrationgradient(watermovesdownawaterpotentialgradient,notconcentrationgradient) Stillwantmore?www.tha