POST UTME SUMMIT UNIVERSITY 2022 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 2022 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
In a population of 1000 individuals, 20% are homozygous dominant (BB), 40% are heterozygous (Bb), and 40% are homozygous recessive (bb). What is the probability that two individuals chosen at random will have offspring with the BB genotype?
Correct A. 0.1
B. 0.2
C. 0.3
D. 0.4

Correct Answer: A

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Question 2
A 2.5-liter solution contains 1.5 liters of ethanol and 1 liter of water. If 0.5 liters of ethanol is added to the solution, what is the new concentration of ethanol in the solution?
A. 0.6
Correct B. 0.7
C. 0.8
D. 0.9

Correct Answer: B

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Question 3
In a certain e\cosystem, the population of rabbits grows according to the \logistic growth model: dP/dt = rP\( 1-P/K \). If the initial population is 100, the carrying capacity is 1000, and the growth rate is 0.2, what is the population after 5 years?
A. 500
B. 600
Correct C. 700
D. 800

Correct Answer: C

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Question 4
A diagram of a plant cell is shown below. Identify the part labeled A.
Correct A. Nucleus
B. Mitochondria
C. Chloroplast
D. Vacuole

Correct Answer: A

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Question 5
A diagram of a simple harmonic motion is shown below. Identify the amplitude of the motion.
A. 2
Correct B. 3
C. 4
D. 5

Correct Answer: B

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Question 6
In a study on the epidemio\logy of malaria, researchers found that the prevalence of the disease was higher in areas with poor sanitation and inadequate waste management. Which of the following is a likely explanation for this observation?
Correct A. The presence of s\tanding water in these areas allows mosquitoes to breed and transmit the disease.
B. The poor sanitation and inadequate waste management lead to the spread of other diseases, which can increase the risk of malaria.
C. The researchers' sampling method was biased towards areas with poor sanitation.
D. The prevalence of malaria is not affected by sanitation and waste management practices.

Correct Answer: A

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Question 7
A patient is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. Which of the following is a likely consequence of this disorder?
A. The patient will experience severe muscle weakness and fatigue.
Correct B. The patient will have difficulty digesting certain types of food.
C. The patient will be more susceptible to infections.
D. The patient will have an increased risk of developing certain types of cancer.

Correct Answer: B

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Question 8
A researcher is studying the structure of a protein and wants to determine the location of a specific amino acid. Which of the following techniques would be most appropriate for this task?
Correct A. X-ray crystal\lography
B. Mass spectrometry
C. Nuclear magnetic resonance spectroscopy
D. Electron microscopy

Correct Answer: A

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Question 9
A patient is experiencing symptoms of a severe allergic reaction. Which of the following is a likely cause of this reaction?
Correct A. The patient has a history of allergies and has recently been exposed to a known allergen.
B. The patient has a genetic predisposition to allergies.
C. The patient has been taking a new medication that has caused an allergic reaction.
D. The patient has a viral infection that has triggered an allergic response.

Correct Answer: A

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Question 10
A researcher is studying the eco\logy of a specific e\cosystem and wants to determine the role of a particular species in the food chain. Which of the following techniques would be most appropriate for this task?
A. Radioisotope labeling
Correct B. Stable isotope analysis
C. DNA sequencing
D. Electron microscopy

Correct Answer: B

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Question 11
In a tropical rainforest, the primary consumers are primarily herbivores that feed on the abundant vegetation. Which of the following is the most likely reason for this phenomenon?
Correct A. The high temperature and humidity in the rainforest favor the growth of vegetation.
B. The primary consumers in the rainforest have adapted to feed on the abundant vegetation.
C. The vegetation in the rainforest is toxic to most herbivores.
D. The primary consumers in the rainforest are primarily carnivores.

Correct Answer: A

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Question 12
A plant's xylem is responsible for transporting water and minerals from the roots to the leaves. What is the primary function of the xylem in this process?
A. To transport sugars produced during photosynthesis.
Correct B. To transport water and minerals from the roots to the leaves.
C. To transport waste products from the leaves to the roots.
D. To transport hormones from the roots to the leaves.

Correct Answer: B

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Question 13
The human eye has a unique structure that allows it to detect a wide range of light intensities. Which of the following is the primary function of the iris in this process?
A. To focus light onto the retina.
Correct B. To regulate the amount of light that enters the eye.
C. To detect the color of light.
D. To produce tears to lubricate the eye.

Correct Answer: B

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Question 14
The classification of living things is based on their shared characteristics and evolutionary relationships. Which of the following is the primary method of classification used in bio\logy?
Correct A. Phy\logenetic classification.
B. Morpho\logical classification.
C. Genetic classification.
D. Eco\logical classification.

Correct Answer: A

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Question 15
Asexual reproduction involves the production of offspring without the involvement of gametes. Which of the following is an example of asexual reproduction in plants?
A. Budding.
B. Fragmentation.
Correct C. Spore formation.
D. Pollination.

Correct Answer: C

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Question 16
In a population of 1000 individuals, 70% are heterozygous for the gene controlling the production of a certain enzyme. If 20% of the population is homozygous recessive, what is the frequency of the recessive allele?
A. 0.3
Correct B. 0.2
C. 0.1
D. 0.05

Correct Answer: B

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Question 17
A cell is placed in a solution with a pH of 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 18
A 5-year-old child is diagnosed with a rare genetic disorder that affects the production of a certain enzyme. The child's parents are both carriers of the recessive allele. What is the probability that their next child will be affected?
Correct A. 0.25
B. 0.5
C. 0.75
D. 1

Correct Answer: A

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Question 19
A population of 1000 individuals is divided into 5 equal-sized groups. Each group has a different allele frequency for a certain gene. If the frequency of the dominant allele is 0.8 in group A, 0.6 in group B, 0.4 in group C, 0.2 in group D, and 0.1 in group E, what is the average frequency of the dominant allele in the entire population?
A. 0.4
B. 0.5
Correct C. 0.6
D. 0.7

Correct Answer: C

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Question 20
A researcher wants to study the effect of a certain environmental factor on the growth of a plant. The researcher sets up an experiment with 5 different levels of the environmental factor. If the researcher wants to determine the effect of the environmental factor on the plant's growth, what type of experimental design should the researcher use?
Correct A. Controlled Experiment
B. Quasi-Experiment
C. Correlational Study
D. Survey Study

Correct Answer: A

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Question 21
In a population of 1000 bacteria, 80% are resis\tant to antibiotic X. If a sample of 50 bacteria is taken, what is the probability that it contains at least one resis\tant bacterium?
A. 0.2
Correct B. 0.4
C. 0.6
D. 0.8

Correct Answer: B

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Question 22
A species of bird has a beak length of 10 cm. If the beak length increases by 20% in one generation, what is the new beak length?
Correct A. 12 cm
B. 11 cm
C. 9 cm
D. 8 cm

Correct Answer: A

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Question 23
A cell divides by mitosis to produce two daughter cells. If the original cell has 20 chromosomes, how many chromosomes will each daughter cell have?
A. 10
Correct B. 20
C. 30
D. 40

Correct Answer: B

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Question 24
A diagram shows a plant with 5 petals. If the plant undergoes asexual reproduction, what is the probability that the offspring will have 5 petals?
A. 0.2
B. 0.4
C. 0.6
Correct D. 0.8

Correct Answer: D

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Question 25
A diagram shows a circuit with a battery, a resistor, and a switch. If the switch is closed, what is the current in the circuit?
A. 2 A
Correct B. 4 A
C. 6 A
D. 8 A

Correct Answer: B

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