POST UTME UI 2020 Biology | Objective

Are you preparing for POST UTME UI exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 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 hormonal coordination, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?
A. Regulation of body temperature
B. Maintenance of blood glu\cose levels
Correct C. Stress response and adaptation
D. Regulation of appetite and satiety

Correct Answer: C

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Question 2
A plant is placed in a solution with a high concentration of sucrose. Which of the following is a likely effect on the plant's growth?
A. Increased growth rate due to increased water potential
B. Decreased growth rate due to decreased water potential
C. No effect on growth rate
Correct D. Increased growth rate due to increased turgor pressure

Correct Answer: D

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Question 3
A diagram of the human kidney is shown below. What is the primary function of the renal pelvis?
A. To filter waste products from the blood
B. To regulate blood pressure
C. To concentrate urine
Correct D. To collect and transport urine to the bladder

Correct Answer: D

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Question 4
A diagram of the human heart is shown below. What is the primary function of the atrioventricular (AV) node?
A. To regulate heart rate
Correct B. To conduct electrical impulses from the atria to the ventricles
C. To pump blood from the heart to the lungs
D. To regulate blood pressure

Correct Answer: B

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Question 5
A diagram of the human nervous system is shown below. What is the primary function of the cerebellum?
A. To regulate body temperature
B. To maintain posture and balance
C. To process sensory information
Correct D. To control voluntary movements

Correct Answer: D

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Question 6
In a population of 1000 individuals, 20% are heterozygous for a particular gene and 30% are homozygous recessive. What is the frequency of the dominant allele?
Correct A. 0.2
B. 0.3
C. 0.4
D. 0.5

Correct Answer: A

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Question 7
A cell in interphase has a DNA content of 2C. If the cell undergoes mitosis, what will be the DNA content of the daughter cells?
A. 2C
Correct B. 4C
C. 6C
D. 8C

Correct Answer: B

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Question 8
In a desert e\cosystem, the primary producers are mainly cacti and succulents. What is the role of these plants in the e\cosystem?
A. Decomposers
B. Primary consumers
C. Secondary consumers
Correct D. Producers

Correct Answer: D

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Question 9
A person with a blood type of AB+ has a child with a person with a blood type of A-. What is the blood type of the child?
A. A-
B. A+
Correct C. AB-
D. O-

Correct Answer: C

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Question 10
In a forest e\cosystem, the primary consumers are mainly deer and rabbits. What is the role of these animals in the e\cosystem?
A. Decomposers
B. Primary producers
Correct C. Secondary consumers
D. Tertiary consumers

Correct Answer: C

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Question 11
The diagram below shows the structure of a mitochondrion. Which of the following is the correct function of the cristae?
A. Increa\sing the surface area for diffusion
Correct B. Increa\sing the surface area for respiration
C. Increa\sing the surface area for photosynthesis
D. Increa\sing the surface area for osmosis

Correct Answer: B

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Question 12
The diagram below shows the structure of a plant root. Which of the following is the correct function of the root hair?
Correct A. Increa\sing the surface area for absorption
B. Increa\sing the surface area for respiration
C. Increa\sing the surface area for photosynthesis
D. Increa\sing the surface area for osmosis

Correct Answer: A

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Question 13
The diagram below shows the structure of a human eye. Which of the following is the correct function of the lens?
Correct A. Focu\sing light on the retina
B. Focu\sing light on the cornea
C. Focu\sing light on the lens
D. Focu\sing light on the pupil

Correct Answer: A

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Question 14
The diagram below shows the structure of a human heart. Which of the following is the correct function of the atrioventricular (AV) node?
Correct A. Regulating the heartbeat
B. Regulating the blood pressure
C. Regulating the blood flow
D. Regulating the oxygen levels

Correct Answer: A

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Question 15
The diagram below shows the structure of a human brain. Which of the following is the correct function of the cerebral cortex?
A. Regulating the heartbeat
B. Regulating the blood pressure
C. Regulating the blood flow
Correct D. Proces\sing sensory information

Correct Answer: D

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Question 16
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. 0.36
Correct B. 0.64
C. 0.16
D. 0.04

Correct Answer: B

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Question 17
A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.25 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, what is the maximum speed of the block?
A. 0.25\sqrt{10}
Correct B. 0.5\sqrt{10}
C. 0.75\sqrt{10}
D. 1.0\sqrt{10}

Correct Answer: B

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Question 18
A population of bacteria is growing according to the \logistic growth equation. If the initial population size is 100, the carrying capacity is 1000, and the growth rate is 0.5, what is the population size after 5 generations?
A. 400
Correct B. 600
C. 800
D. 1000

Correct Answer: B

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Question 19
A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the pH of the resulting solution?
A. 1
Correct B. 7
C. 10
D. 14

Correct Answer: B

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Question 20
A 5 kg block is moving at a speed of 2 m/s on a frictionless surface. If the block is subjected to a cons\tant force of 10 N, what is the acceleration of the block?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 21
The nervous system's coordination of muscle contractions is primarily mediated by the
Correct A. somatic nervous system
B. autonomic nervous system
C. sympathetic nervous system
D. parasympathetic nervous system

Correct Answer: A

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Question 22
The process of eco\logical succession in a newly formed volcanic island is an example of
Correct A. primary succession
B. secondary succession
C. climax community
D. eco\logical balance

Correct Answer: A

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Question 23
The genetic variation in a population is increased by
Correct A. mutation
B. genetic drift
C. gene flow
D. natural selection

Correct Answer: A

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Question 24
The sense organ responsible for detecting changes in sound pressure is the
Correct A. cochlea
B. stapes
C. tympanic membrane
D. auditory nerve

Correct Answer: A

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Question 25
The microorganism responsible for cau\sing tuberculosis is
Correct A. Mycobacterium tuberculosis
B. Staphylococcus aureus
C. Escherichia coli
D. Salmonella typhi

Correct Answer: A

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