POST UTME UNIBEN 2022 Biology | Objective

Are you preparing for POST UTME UNIBEN exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2022 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
A 20-year-old male patient presents with a 2-year history of progressive hearing loss. His audiogram shows a flat bone conduction threshold with a steeply sloping air conduction threshold. Which of the following is the most likely diagnosis?
A. Sensorineural hearing loss
B. Conductive hearing loss
C. Mixed hearing loss
Correct D. Otosclerosis

Correct Answer: D

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Question 2
A cell in the G2 phase of the cell cycle has a DNA content of 8C. What is the most likely explanation for this?
Correct A. Endoreduplication
B. Polyploidy
C. DNA replication error
D. Mitotic error

Correct Answer: A

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Question 3
A 35-year-old woman presents with a 5-year history of infertility. Her husband has a normal semen analysis. Which of the following is the most likely cause of her infertility?
Correct A. Tubal blockage
B. Endometriosis
C. Polycystic ovary syndrome
D. Unexplained infertility

Correct Answer: A

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Question 4
A 25-year-old man presents with a 2-year history of progressive weakness and fatigue. His electromyogram shows a pattern of myopathic changes. Which of the following is the most likely diagnosis?
Correct A. Muscular dystrophy
B. Myasthenia gravis
C. Polymyositis
D. Lambert-Eaton syndrome

Correct Answer: A

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Question 5
A 30-year-old woman presents with a 1-year history of recurrent miscarriages. Her thyroid function tests show a low TSH level. Which of the following is the most likely cause of her condition?
A. Thyroiditis
Correct B. Graves' disease
C. Hashimoto's thyroiditis
D. Subclinical hypothyroidism

Correct Answer: B

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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 homozygous dominant genotype 'AA'?
A. 0.2
B. 0.4
Correct C. 0.6
D. 0.8

Correct Answer: C

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Question 7
A cell in interphase has a DNA content of 2C. If the cell enters mitosis and undergoes two successive cell divisions, what will be the DNA content of the daughter cells after the second division?
A. 1C
B. 2C
Correct C. 4C
D. 8C

Correct Answer: C

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Question 8
A 2.5 M solution of glu\cose is diluted to 0.5 M. What is the volume of the solvent added to achieve this dilution?
A. 1 L
B. 2 L
Correct C. 4 L
D. 6 L

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. 0.25
B. 0.5
C. 0.75
D. 1

Correct Answer: A

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Question 10
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 0.05 per hour, what will be the population size after 5 hours?
A. 1000
B. 2000
Correct C. 3000
D. 4000

Correct Answer: C

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Question 11
In the context of osmoregulation, what is the primary function of the hormone vasopres\sin in the human body?
A. Regulation of blood pressure
Correct B. Regulation of water reabsorption in the kidneys
C. Regulation of electrolyte balance
D. Regulation of blood sugar levels

Correct Answer: B

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Question 12
Asexual reproduction in plants can occur through the process of
A. Budding
Correct B. Fragmentation
C. Runners
D. Spores

Correct Answer: B

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Question 13
The nervous system in humans is primarily responsible for
A. Regulation of body temperature
B. Regulation of blood pressure
Correct C. Coordination of voluntary movements
D. Regulation of heart rate

Correct Answer: C

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Question 14
The process of evolution can be described by the following equation: \( Delta W = -k ln P \)
A. ΔW is the change in fitness
B. k is the Boltzmann cons\tant
Correct C. P is the probability of a mutation
D. W is the work done by the organism

Correct Answer: C

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Question 15
In the context of classification of living things, the kingdom Monera includes
Correct A. Bacteria and archaea
B. Fungi and protozoa
C. Plants and animals
D. Protists and algae

Correct Answer: A

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Question 16
In the context of osmoregulation, what is the primary function of the kidneys in maintaining electrolyte balance?
Correct A. To regulate the concentration of ions in the blood
B. To remove excess water from the body
C. To maintain acid-base balance
D. To regulate blood pressure

Correct Answer: A

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Question 17
A population of Drosophila melanogaster is being studied for its evolutionary adaptations. Which of the following traits would be an example of a neutral mutation?
A. A mutation that increases the wingspan of the flies
B. A mutation that changes the color of the flies' eyes
Correct C. A mutation that has no effect on the flies' fitness
D. A mutation that increases the flies' resis\tance to pesticides

Correct Answer: C

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Question 18
A diagram of the human respiratory system is shown below. What is the primary function of the alveoli?
Correct A. To exchange oxygen and carbon dioxide with the blood
B. To filter the air we breathe
C. To produce mucus that traps dust and other particles
D. To regulate body temperature

Correct Answer: A

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Question 19
A diagram of the human eye is shown below. What is the primary function of the retina?
A. To focus light onto the retina
B. To regulate the amount of light that enters the eye
Correct C. To convert light into electrical signals that are sent to the brain
D. To produce tears that lubricate the eye

Correct Answer: C

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Question 20
A diagram of the human skeletal system is shown below. What is the primary function of the sternum?
Correct A. To protect the heart and lungs
B. To provide attachment points for muscles
C. To serve as a site for muscle attachment
D. To regulate body temperature

Correct Answer: A

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Question 21
In a typical mammalian kidney, which of the following structures is primarily responsible for the reabsorption of glu\cose from the filtrate?
Correct A. Proximal convoluted tubule
B. Loop of Henle
C. Distal convoluted tubule
D. Collecting duct

Correct Answer: A

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Question 22
The diagram below represents a cross-section of a plant root. Which of the following structures is responsible for the absorption of water and minerals from the soil?
Correct A. Root hair cells
B. Xylem vessels
C. Phloem sieve cells
D. Cortex

Correct Answer: A

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Question 23
The process of osmoregulation in animals involves the regulation of which of the following subs\tances to maintain proper osmotic balance?
A. Water
Correct B. Sodium ions
C. Glu\cose
D. Proteins

Correct Answer: B

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Question 24
The diagram below represents a simple electrical circuit. Which of the following components is responsible for the flow of electrons through the circuit?
A. Battery
B. Resistor
Correct C. Wire
D. Switch

Correct Answer: C

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Question 25
The theory of evolution by natural selection proposes that which of the following mechanisms is responsible for the adaptation of species to their environments?
A. Genetic drift
B. Mutation
C. Gene flow
Correct D. Natural selection

Correct Answer: D

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