NCERT/Class 10/Science/How do Organisms Reproduce?

How do Organisms Reproduce?

Class 10 · Science

150 questions50 easy50 medium50 hard

Sample Questions

Q1.In which of the following organisms does asexual reproduction occur by fragmentation AND the organism also has some regenerative ability?

  • AAmoeba
  • BPlanaria
  • CYeast
  • DRhizopus

Q2.The pollen tube grows from the stigma to the ovule, passing through the style. What guides the direction of pollen tube growth toward the ovule?

  • AThe pollen tube grows randomly and reaches the ovule by chance
  • BChemical signals (chemotropism) released by the ovule direct the growth of the pollen tube
  • CGravity guides the pollen tube downward toward the ovule
  • DThe style contracts physically to guide the pollen tube

Q3.A woman uses a Copper-T as contraception. If despite this she becomes pregnant, at which step in reproduction is the Copper-T's primary mechanism of action MOST LIKELY to have failed?

  • AOvulation was not prevented
  • BSperm production was not stopped
  • CThe blastocyst implanted in the endometrium despite the presence of Copper-T
  • DThe fallopian tube was not blocked

Q4.How does the organism Planaria exhibit the ability for regeneration?

  • APlanaria produces spores that regenerate into new individuals
  • BSpecialised cells in Planaria proliferate and differentiate in an organised manner to form a complete organism from a body fragment
  • CPlanaria's cells individually reproduce by mitosis to fill in missing parts
  • DPlanaria produces chemical signals that attract other Planaria to merge

Q5.How does the embryo receive nourishment before the placenta is fully formed?

  • AFrom photosynthesis in the embryo
  • BFrom the yolk sac in very early stages and then from the developing placenta
  • CDirectly from the mother's blood mixing with embryo's blood
  • DFrom spores stored in the uterus

Q6.This is a sample question to preview what you'll get in the full practice test...

  • A. Option one
  • B. Option two
  • C. Option three
  • D. Option four
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Concepts Covered

AIDSAmoebaBryophyllumCopper-TDNADNA copyingDNA mutationDNA replicationDNA variationHIVHIV preventionHIV/AIDSHydraIUDIVFLH FSHLeishmaniaMuller's ratchetPlanariaPlasmodiumRhizopusS phaseSTD complicationsSTD preventionSTDsSpirogyraTreponema pallidumaccessory glandsadolescenceadolescent healthadvantagesadventitious rootsallele frequencyangiospermsantherantiviral vs antibioticasexual reproductionasymptomatic infectionasymptomatic infectionsbacteriabacterial STDsbarrier methodsbinary fissionblastocystbody designbody organisationbread mouldbuddingcell cyclecell differentiationcell divisioncell division orientationcell proliferationcell specialisationcentral dogmachemotropismchromosome numbercloningcondomcondomscontraceptioncontraception comparisoncontraception mechanismcorpus luteumcrop diseasecross-pollinationdevelopmentdiploiddisease resistancedormancydouble fertilizationearly embryo developmentearly embryo nutritionearly pregnancyecologyembryo nutritionemergency contraceptionendometriumendospermestrogenevolutionexperimental designfallopian tubefemale reproductive systemfemale sterilizationfertilizationfidelityfissionflagellumflower partsflowersfoetal developmentfoetal nutritionfoetal tolerancefragmentationfruit formationgametesgenetic continuitygenetic identitygenetic lineagegenetic recombinationgenetic uniformitygenetic variationgestation periodgraftinghCGhaploidheritable variationhormonal contraceptiveshormonal regulationhormoneshybrid plantsimmune systemimplantationindividual vs species benefitinheritanceinsect-pollinationlayeringleaf propagationlethal mutationmalaria life cyclemale gametemale gametesmale reproductive systemmale sterilizationmeiosismenarchemenstrual cyclemenstruationmeristematic tissuemitosismodes of reproductionmulticellular organismsmultiple fissionmutationmutation accumulationnatural selectionnichenodesoral contraceptivesovaryovulationovulepetalspistilplacentaplacenta developmentplant reproductionplant reproduction strategypollenpollen germinationpollen overproductionpollen tubepollen tube growthpollinationpollination adaptationspollination efficiencypollination vectorspopulationpopulation stabilitypost-fertilizationpost-fertilization changespregnancyprimary sexual characteristicsprogesteroneprostate glandprotective coatprotein synthesisproteinspubertyregenerationreproductionreproduction basicsreproduction distinctionreproductive healthreproductive isolationrole of petalsschizogonyscrotumsecondary sexual characteristicsseed formationseedless plantsseedsself-pollinationsemensequence of eventssexual reproductionsexual reproduction in plantsspecies compatibilityspecies survivalsperm structurespermatogenesisspore characteristicsspore formationsporesstamenstem cellsstem cuttingsstem modificationsterilizationstigmastylesyphilistestestotipotencytransmissiontreatmenttriploidtubectomytubersuterusvariationvas deferensvasectomyvegetative propagationviral integrationwind-pollinationwound healingyeast

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