POST UTME UNIOSUN 2020 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 2020 Biology (Objective) questions designed to simulate the real exam environment.

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

Correct Answer: A

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Question 2
A cell in interphase is preparing for DNA replication. What is the stage of the cell cycle at which this occurs?
A. G1
B. G2
Correct C. S
D. M

Correct Answer: C

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Question 3
A diagram of a plant cell is shown below. What is the function of the structure labeled 'X'?
A. Photosynthesis
B. Respiration
C. Storage of nutrients
Correct D. Regulation of cell growth

Correct Answer: D

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Question 4
A diagram of a simple e\cosystem is shown below. What is the role of the organism labeled 'Y'?
A. Primary producer
B. Primary consumer
C. Decomposer
Correct D. Secondary consumer

Correct Answer: D

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Question 5
A diagram of a simple circuit is shown below. What is the value of the current flowing through the circuit?
A. 2A
B. 4A
Correct C. 6A
D. 8A

Correct Answer: C

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Question 6
In a population of 1000 individuals, 200 are heterozygous for a particular gene. If the gene is inherited in an autosomal dominant manner, what is the frequency of the dominant allele?
A. 0.25
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

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Question 7
A 2-year-old child is diagnosed with a rare genetic disorder characterized by an inability to synthesize a particular amino acid. Which of the following is the most likely cause of this disorder?
Correct A. Mutation in the gene encoding the enzyme responsible for the amino acid synthesis
B. Deletion of the gene encoding the enzyme responsible for the amino acid synthesis
C. Inheri\tance of a recessive allele that codes for a non-functional enzyme
D. Infection with a virus that disrupts the gene encoding the enzyme

Correct Answer: A

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Question 8
A researcher is studying the effect of pH on the growth of a particular microorganism. The researcher observes that the microorganism grows best at a pH of 7.5. What is the most likely reason for this observation?
A. The microorganism has an optimal pH for growth at 7.5
Correct B. The microorganism has a pH-dep\endent enzyme that is most active at 7.5
C. The microorganism has a pH-dep\endent transport mechanism that is most active at 7.5
D. The microorganism has a pH-dep\endent membrane structure that is most stable at 7.5

Correct Answer: B

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Question 9
A 30-year-old woman is diagnosed with a rare disease characterized by an inability to synthesize a particular hormone. Which of the following is the most likely cause of this disease?
Correct A. Mutation in the gene encoding the enzyme responsible for the hormone synthesis
B. Deletion of the gene encoding the enzyme responsible for the hormone synthesis
C. Inheri\tance of a recessive allele that codes for a non-functional enzyme
D. Infection with a virus that disrupts the gene encoding the enzyme

Correct Answer: A

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Question 10
A researcher is studying the effect of temperature on the growth of a particular microorganism. The researcher observes that the microorganism grows best at a temperature of 37°C. What is the most likely reason for this observation?
A. The microorganism has an optimal temperature for growth at 37°C
Correct B. The microorganism has a temperature-dep\endent enzyme that is most active at 37°C
C. The microorganism has a temperature-dep\endent transport mechanism that is most active at 37°C
D. The microorganism has a temperature-dep\endent membrane structure that is most stable at 37°C

Correct Answer: B

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Question 11
In a photosynthetic pathway, which of the following is the primary acceptor of electrons in the light-dep\endent reactions?
Correct A. P680
B. P700
C. Pheophytin
D. Plastocyanin

Correct Answer: A

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Question 12
Which of the following is a characteristic of a eukaryotic cell?
Correct A. Presence of a true nucleus
B. Presence of a cell wall
C. Presence of ribosomes
D. Presence of a Golgi apparatus

Correct Answer: A

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Question 13
The process by which plants convert light energy into chemical energy is known as?
A. Respiration
Correct B. Photosynthesis
C. Transpiration
D. Translocation

Correct Answer: B

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Question 14
The hormone responsible for promoting seed germination is?
A. Auxin
Correct B. Gibberellin
C. Cytokinin
D. Ethylene

Correct Answer: B

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Question 15
The process by which an organism's genetic information is passed from one generation to the next is known as?
A. Mutation
B. Genetic drift
C. Gene flow
Correct D. Heritability

Correct Answer: D

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Question 16
In a population of 1000 individuals, 20% are heterozygous for a particular gene, while 80% are homozygous recessive. If two individuals are randomly selected for a study, what is the probability that they are both heterozygous?
Correct A. 0.16
B. 0.32
C. 0.48
D. 0.64

Correct Answer: A

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Question 17
A plant grows in a nutrient-poor soil. Which of the following is a likely adaptation of this plant?
A. Deep roots to access water
B. Large leaves to increase photosynthesis
Correct C. Small leaves to reduce transpiration
D. Waxy stems to prevent water loss

Correct Answer: C

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Question 18
A 2.5 kg object is moving at a speed of 4.0 m/s. What is its kinetic energy?
A. 10 J
Correct B. 20 J
C. 30 J
D. 40 J

Correct Answer: B

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Question 19
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 20
A 5.0 L flask contains 2.0 mol of an ideal gas at a temperature of 300 K. What is the pressure of the gas?
A. 10.2 kPa
Correct B. 20.4 kPa
C. 30.6 kPa
D. 40.8 kPa

Correct Answer: B

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Question 21
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 by-product of this process?
Correct A. Oxygen
B. Carbon dioxide
C. Water
D. Nitrogen

Correct Answer: A

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Question 22
The diagram below shows the structure of a mitochondrion. Which of the following is the function of the cristae?
A. Site of protein synthesis
B. Site of lipid synthesis
C. Site of electron transport
Correct D. Site of ATP synthesis

Correct Answer: D

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Question 23
The Hardy-Weinberg principle states that the frequency of alleles in a population remains cons\tant from generation to generation in the absence of certain factors. Which of the following is a factor that can lead to a change in allele frequency?
A. Mutation
B. Gene flow
C. Genetic drift
Correct D. Natural selection

Correct Answer: D

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Question 24
The diagram below shows the structure of a neuron. Which of the following is the function of the d\endrites?
A. Site of protein synthesis
B. Site of lipid synthesis
C. Site of electron transport
Correct D. Site of signal transmission

Correct Answer: D

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Question 25
The process of digestion in the small intestine involves the breakdown of carbohydrates, proteins, and fats into their respective monomers. Which of the following enzymes is responsible for the breakdown of starch into maltose?
Correct A. Amylase
B. Lipase
C. Tryp\sin
D. Lactase

Correct Answer: A

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