POST UTME SUMMIT UNIVERSITY 2020 Biology | Objective

Are you preparing for POST UTME SUMMIT UNIVERSITY 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 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?
Correct A. 0.36
B. 0.64
C. 0.16
D. 0.04

Correct Answer: A

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Question 2
A diagram of the human eye is shown below.
A. The cornea is responsible for re\fracting light.
B. The lens is responsible for changing the focal length.
Correct C. The retina is responsible for detecting light.
D. The pupil is responsible for controlling the amount of light that enters the eye.

Correct Answer: C

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Question 3
In a cell division process, the chromosomes are duplicated and then separated into two daughter cells. What is the term for this process?
Correct A. Mitosis
B. Meiosis
C. DNA replication
D. Transcription

Correct Answer: A

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Question 4
A diagram of the human kidney is shown below.
Correct A. The glomerulus is responsible for filtering waste from the blood.
B. The renal pelvis is responsible for storing urine.
C. The calyces are responsible for collecting urine.
D. The ureters are responsible for transporting urine to the bladder.

Correct Answer: A

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Question 5
In a population of E. coli, the frequency of the dominant allele 'B' is 0.8. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype?
Correct A. 0.16
B. 0.64
C. 0.36
D. 0.04

Correct Answer: A

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Question 6
In a population of 1000 organisms, 200 are heterozygous for a particular gene, 300 are homozygous dominant, and 500 are homozygous recessive. What is the frequency of the recessive allele?
Correct A. 0.5
B. 0.4
C. 0.3
D. 0.2

Correct Answer: A

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Question 7
A cell is placed in a solution with a pH of 5.5. If the cell membrane has a permeability coefficient of 0.01 cm/s, what is the rate of diffusion of H+ ions into the cell?
Correct A. 0.01
B. 0.1
C. 1
D. 10

Correct Answer: A

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Question 8
A 5 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, what is the maximum speed of the block?
A. 2
B. 4
Correct C. 6
D. 8

Correct Answer: C

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Question 9
A population of 1000 organisms is growing \logistically with a carrying capacity of 2000 and a growth rate of 0.1. If the initial population is 500, what is the population after 5 years?
A. 1500
B. 2000
C. 2500
Correct D. 3000

Correct Answer: D

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Question 10
A 2 m long rod is heated from 20°C to 100°C. If the coefficient of linear expansion is 10^-5 K^-1, what is the change in length of the rod?
Correct A. 0.1
B. 0.2
C. 0.3
D. 0.4

Correct Answer: A

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Question 11
In the context of evolutionary theories, what is the primary mechanism by which genetic drift influences the frequency of a particular allele in a population?
A. Natural selection
Correct B. Genetic drift
C. Gene flow
D. Mutation

Correct Answer: B

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Question 12
A plant cell is placed in a solution with a high concentration of sucrose. What is the expected outcome regarding the movement of water into the cell?
A. Water will move out of the cell
Correct B. Water will move into the cell
C. Water will remain the same
D. The cell will burst

Correct Answer: B

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Question 13
A patient is diagnosed with a kidney disease that affects the excretion of waste products. Which of the following is a likely consequence of this disease?
A. Increased blood pressure
B. Decreased blood pressure
C. Increased urine production
Correct D. Decreased urine production

Correct Answer: D

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Question 14
A photosynthetic organism is placed in a light-limited environment. What is the expected outcome regarding its growth rate?
A. Increased growth rate
Correct B. Decreased growth rate
C. No change in growth rate
D. The plant will die

Correct Answer: B

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Question 15
A patient is diagnosed with a blood disorder that affects the production of red blood cells. Which of the following is a likely consequence of this disorder?
A. Increased hemoglobin levels
Correct B. Decreased hemoglobin levels
C. Increased white blood cell count
D. Decreased platelet count

Correct Answer: B

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Question 16
In a tropical rainforest, the leaf litter layer is composed of decaying plant material. What is the primary role of this layer in the e\cosystem?
A. To provide shelter for animals
Correct B. To act as a nutrient-rich substrate for plant growth
C. To regulate the temperature of the forest floor
D. To prevent soil erosion

Correct Answer: B

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Question 17
The diagram below shows the structure of a nerve cell. What is the function of the myelin sheath?
A. To transmit nerve impulses
B. To provide structural support to the nerve cell
Correct C. To insulate the nerve cell from electrical interference
D. To facilitate the exchange of nutrients and waste products

Correct Answer: C

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Question 18
The xylem and phloem tissues in a plant are responsible for transporting water and nutrients, respectively. What is the primary mechanism by which water is transported through the xylem?
Correct A. Transpiration pull
B. Osmosis
C. Diffusion
D. Active transport

Correct Answer: A

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Question 19
The Hardy-Weinberg principle states that the frequency of a gene in a population remains cons\tant from generation to generation in the absence of genetic drift, mutation, and gene flow. What is the primary reason for the Hardy-Weinberg principle?
A. To describe the genetic variation in a population
Correct B. To predict the frequency of a gene in a population
C. To explain the concept of genetic drift
D. To demonstrate the concept of natural selection

Correct Answer: B

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Question 20
The diagram below shows the life cycle of a bacterium. What is the primary function of the lysogenic cycle?
A. To produce a new generation of bacteria
Correct B. To integrate the viral genome into the host genome
C. To produce a new virus particle
D. To lyse the host cell

Correct Answer: B

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Question 21
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. Response to stress and anxiety
D. Regulation of appetite and satiety

Correct Answer: C

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Question 22
A patient is diagnosed with a kidney stone. Which of the following is a common cause of kidney stones?
A. Dehydration
B. Genetic predisposition
C. Diet high in oxalate
Correct D. All of the above

Correct Answer: D

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Question 23
In the context of growth and regulation, what is the primary function of the somatostatin hormone?
A. Stimulation of cell growth
Correct B. Inhibition of cell growth
C. Regulation of blood sugar levels
D. Regulation of body temperature

Correct Answer: B

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Question 24
A bio\logist is studying the classification of living things. Which of the following is a characteristic of prokaryotic cells?
A. Presence of a true nucleus
B. Presence of mitochondria
Correct C. Lack of a true nucleus
D. Presence of a cell wall

Correct Answer: C

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Question 25
A patient is experiencing symptoms of dehydration. Which of the following is a common sign of dehydration?
A. Increased urine output
B. Decreased urine output
C. Dry mouth and throat
Correct D. All of the above

Correct Answer: D

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