All 15 questions from the Post-UTME Screening (Post-UTME) Biology 2008 Objective paper, with the correct answer and a full explanation for each. Free, no signup needed.
Which of the following infections is unlikely to respond to antibiotics treatment?
A. TetanusB. MeaslesCorrect C. Typhoid feverD. RingwormExplanation Measles is viral; antibiotics are ineffective against viral infections.
Pest can be controlled without the subsequent danger of polluting the ecosystem by
A. Spraying the ecosystem with pesticideB. Keeping the population of natural enemies constantC. Increasing the population of natural enemies of the pestCorrect D. Eliminating the natural enemies of the pestsExplanation Biological control (boosting natural predators) avoids the pollution risk of chemical pesticides.
Autotrophs are also described as
A. ConsumersB. CarnivoresC. ProducersCorrect D. DecomposersExplanation Autotrophs are the producers in an ecosystem.
Which of the following bones is NOT a component of the appendicular skeleton?
A. TibiaB. SacrumCorrect C. RadiusD. HumerusExplanation The sacrum belongs to the axial skeleton, not the appendicular skeleton.
If two parents are sickle cell carriers, then their genotypes would be
A. HbA HbA and HbA HbAB. HbA HbA and HbS HbSC. HbA HbS and HbA HbSCorrect D. HbS HbS and HbS HbSExplanation Sickle cell carriers are heterozygous, HbA HbS, for both parents.
Procaryotic cells are found in
A. MoneransCorrect B. AlgaeC. TracheophytesD. SpirogyraExplanation The kingdom Monera consists of prokaryotic organisms.
The correct order of classification of human being is
A. Animalia, Chordata, Vertebrata, Mammalia, Primate, Hominidae, Homo and SapiensCorrect B. Animalia, Vertebrata, mammalia, chordata, Primate, Homo, sapiens and HominideeC. Chordata, Animalia, Vertebrata, Mammalia, Primate, Hominidae, Homo and sapiensD. Animalia, Chordata, Vertebrate, Primate, mammalia, Homo and sapiensExplanation This is the standard taxonomic hierarchy for humans.
Deficiency of sulphur causes
A. Poor, weedy growthB. Extremely stunted growthC. Yellowing of leaves, stems become slenderCorrect D. Weak, stunted growthExplanation Sulphur deficiency typically causes yellowing (chlorosis) and slender stems.
Vitamin K is important in the
A. Formation of enzymes involved in synthesis of amino acidsB. Formation of red blood cellsC. Synthesis of blood clotting factorsCorrect D. Formation of co-enzymes involved in cellular respirationExplanation Vitamin K is essential for synthesizing blood clotting factors.
The following are the components of nucleotides except
A. A five-carbon sugarB. A six-carbon sugarCorrect C. A phosphate groupD. An organic nitrogen-containing baseExplanation Nucleotides contain a five-carbon sugar, not a six-carbon sugar.
Which of the following inherited conditions usually shows incomplete dominance?
A. BaldnessB. Tongue rolling abilityC. HaemophiliaD. Sickle cell anaemiaCorrect Explanation Sickle cell trait shows incomplete dominance/codominance.
Which of the following is not a theory under Darwin's theory of organic evolution?
A. Over productionB. Struggle for existenceC. MutationCorrect D. (option not fully legible)Explanation Mutation as a mechanism was formalized later, not part of Darwin's original theory.
Which of the following does not cause mutation?
A. X-raysB. MutantCorrect C. Ultra-violet lightD. Cosmic radiationExplanation A 'mutant' is the resulting organism, not a cause of mutation.
Which of the following organisms shows homodont dentition?
A. LizardCorrect B. SheepC. CatD. ManExplanation Reptiles like lizards typically show homodont (uniform) dentition.
Which of the following habitats cannot be used for the study of succession?
A. A pondB. Savanna grasslandC. Well cultivated landCorrect D. Abandoned farm landExplanation Continuously cultivated land is regularly disturbed, preventing natural ecological succession.
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