POST UTME UNIOSUN 2018 Biology | Objective

Are you preparing for POST UTME UNIOSUN exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In the context of osmoregulation, what is the primary function of the kidneys in a human being?
A. To regulate blood pressure
Correct B. To remove waste products from the blood
C. To maintain electrolyte balance
D. To regulate body temperature

Correct Answer: B

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Question 2
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 3
In the process of digestion, what is the primary function of the enzyme amylase?
A. To break down proteins into amino acids
Correct B. To break down carbohydrates into simple sugars
C. To break down fats into fatty acids
D. To break down nucleic acids into nucleotides

Correct Answer: B

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Question 4
A diagram of the human respiratory system is shown below. Which part of the system is responsible for exchanging oxygen and carbon dioxide?
Correct A. Lungs
B. Trachea
C. Diaphragm
D. Bronchi

Correct Answer: A

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Question 5
In the context of osmoregulation, what is the primary function of the hormone aldosterone?
A. To regulate blood pressure
B. To remove waste products from the blood
Correct C. To maintain electrolyte balance
D. To regulate body temperature

Correct Answer: C

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Question 6
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'A'?
Correct A. 0.8
B. 0.6
C. 0.4
D. 0.2

Correct Answer: A

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Question 7
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'Rr'?
Correct A. 0.5
B. 0.75
C. 0.25
D. 0.33

Correct Answer: A

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Question 8
A population of bacteria is growing exponentially. If the initial population is 100 and the population doubles every 2 hours, what is the population after 6 hours?
A. 1600
B. 3200
Correct C. 6400
D. 12800

Correct Answer: C

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Question 9
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'rr'. What is the probability that the offspring will have the genotype 'Rr'?
Correct A. 0.5
B. 0.75
C. 0.25
D. 0.33

Correct Answer: A

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Question 10
A population of Drosophila melanogaster is in Hardy-Weinberg equilibrium. If the frequency of the recessive allele 'a' is 0.2, what is the frequency of the dominant allele 'A'?
Correct A. 0.8
B. 0.6
C. 0.4
D. 0.2

Correct Answer: A

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Question 11
In the context of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
B. To produce NADH and FADH2
Correct C. To pump protons across the mitochondrial membrane
D. To reduce oxygen to water

Correct Answer: C

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Question 12
A researcher is studying the effects of pH on enzyme activity. Which of the following enzymes is most likely to be affected by a change in pH?
A. Lactase
B. Amylase
Correct C. Pep\sin
D. Tryp\sin

Correct Answer: C

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Question 13
A diagram of the human eye is shown below. What is the function of the structure labeled 'A'?
Correct A. To focus light on the retina
B. To detect movement
C. To regulate pupil size
D. To produce tears

Correct Answer: A

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Question 14
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 20% per hour, what will be the population size after 3 hours?
A. 1000
B. 2000
Correct C. 4000
D. 8000

Correct Answer: C

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Question 15
A diagram of the water cycle is shown below. What is the process labeled 'A'?
Correct A. Evaporation
B. Condensation
C. Precipitation
D. Runoff

Correct Answer: A

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Question 16
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is a byproduct of this process?
Correct A. Oxygen
B. Carbon dioxide
C. Water
D. Nitrogen

Correct Answer: A

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Question 17
In the human body, the nervous system and the \endocrine system work together to regulate various bodily functions. Which of the following is an example of a hormone that is produced by the adrenal gland?
Correct A. Adrenaline
B. Insulin
C. Thyroxine
D. Growth hormone

Correct Answer: A

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Question 18
The process of digestion in the human body involves the breakdown of food into smaller molecules that can be absorbed and utilized by the body. Which of the following is an enzyme that plays a crucial role in the digestion of proteins?
A. Pep\sin
B. Lactase
C. Amylase
Correct D. Tryp\sin

Correct Answer: D

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Question 19
The theory of evolution by natural selection proposes that species evolve over time through a process of variation, mutation, genetic drift, and gene flow. Which of the following is an example of a mechanism that contributes to genetic variation?
Correct A. Mutation
B. Gene flow
C. Genetic drift
D. Artificial selection

Correct Answer: A

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Question 20
The process of respiration in the human body involves the breakdown of glu\cose to produce energy in the form of ATP. Which of the following is a byproduct of this process?
Correct A. Carbon dioxide
B. Water
C. Oxygen
D. Nitrogen

Correct Answer: A

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Question 21
In the context of evolutionary theories, what is the primary mechanism by which species adapt to their environments?
Correct A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation

Correct Answer: A

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Question 22
Which of the following is an example of asexual reproduction in plants?
A. Budding
B. Fragmentation
Correct C. Runners
D. Rhizome

Correct Answer: C

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Question 23
In the context of sense organs, what is the primary function of the olfactory epithelium?
A. To detect light
B. To detect sound
Correct C. To detect smell
D. To detect taste

Correct Answer: C

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Question 24
What is the primary mechanism by which plants undergo photosynthesis?
A. Respiration
B. Transpiration
Correct C. Photosynthesis
D. Translocation

Correct Answer: C

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Question 25
In the context of evolutionary theories, what is the primary driving force behind speciation?
Correct A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation

Correct Answer: A

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