221. Following are the two statements regarding the origin of life
(1) The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
(2) The first autotrophic organisms were the chemoautotrophs that never released oxygen.
Of the above statements which one of the following options is correct?

A (1) is correct but (2) is false
B (2) is correct but (1) is false
C Both (1) and (2) are correct
D Both (1) and (2) are false
Answer :   Both (1) and (2) are correct
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222. Which of the following sets do not have homologous organs

A Wings of mosquito and butterfly
B Wings of butterfly and bird
C Mouth parts of cockroach and butter fly
D None of the above
Answer :   Wings of butterfly and bird
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223. Which one of the following statement is correct?

A There is no evidence of the existence of gills during embryogenesis of mammals
B All plant and animal cells are totipotent
C Ontogeny repeats phylogeny
D Stem cells are specialize cells
Answer :   Ontogeny repeats phylogeny
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224. In which condition the gene ratio remains constant for any species?

A Sexual selection
B Random mating
C Mutation
D Gene flow
Answer :   Random mating
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225. The ultimate source of organic variation is

A Mutation
B Sexual reproduction
C Natural selection
D Hormonal action
Answer :   Mutation
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226. Thorn of Bougainvillea and tendril of cucurbita are example of

A analogous organs
B homologous organs
C vestigial organs
D retrogressive evolution
Answer :   homologous organs
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227. Evolution is

A progressive development of a race
B history and development of a race alongwith variations
C history of a race
D development of a race
Answer :   history and development of a race alongwith variations
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228. Most recent man found as fossil was

A Java man
B Peking man
C Cromagnon man
D Hiedelberg man
Answer :   Cromagnon man
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229. Genetic drift operates only in

A smaller Populations
B larger Populations
C mendelian Populations
D island Populations
Answer :   smaller Populations
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230. Mutation theory to explain mechanism of evolution was given by Hugo de Vries and he experimented on the

A Garden pea
B Fruity
C China rose
D Evening primerose
Answer :   Evening primerose
Discuss Question

Practice More MCQ Question on Biology Section

BotanyThe Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisonTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and DevelopmentReproduction in OrganismsSexual Reproduction in Flowering PlantsPrinciples of Inheritance and VariationMolecular Basis of InheritanceStrategies for Enhancement in Food ProductionMicrobes in Human WelfareOrganisms and PopulationsEcosystemBiodiversity and ConservationEnvironmental IssuesBotany Miscellaneous
ZoologyAnimal KingdomStructural Organisation in AnimalsBiomoleculesDigestion and AbsorptionBreathing and Exchange of GasesBody Fluids and CirculationExcretory Products and Their EliminationLocomotion and MovementNeural Control and CoordinationChemical Coordination and IntegrationHuman ReproductionReproductive HealthEvolutionHuman Health and DiseasesBiotechnology: Principles and ProcessesBiotechnology and its ApplicationsZoology Miscellaneous