POST UTME UNIOSUN 2019 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 2019 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
The diagram below represents a cross-section of the human eye. Which part of the eye is responsible for detecting light?
A. Cornea
B. Lens
Correct C. Retina
D. Iris

Correct Answer: C

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Question 2
In a freshwater e\cosystem, what is the primary source of energy for the food chain?
A. Grass
B. Plankton
C. Zooplankton
Correct D. Phytoplankton

Correct Answer: D

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Question 3
The process by which plants convert light energy into chemical energy is known as?
A. Respiration
Correct B. Photosynthesis
C. Decomposition
D. Fermentation

Correct Answer: B

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Question 4
In the human excretory system, what is the primary function of the kidneys?
Correct A. To filter waste from the blood
B. To regulate blood pressure
C. To produce hormones
D. To produce red blood cells

Correct Answer: A

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Question 5
The diagram below represents a pedigree chart for a genetic disorder. What is the probability that a child will inherit the disorder if both parents are carriers?
A. 25%
Correct B. 50%
C. 75%
D. 100%

Correct Answer: B

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Question 6
In a eukaryotic cell, the \endoplasmic reticulum (ER) is involved in the synthesis of proteins that are destined for secretion or for use within the cell. Which of the following statements is true about the ER?
A. The ER is a type of organelle found in prokaryotic cells.
B. The ER is responsible for the synthesis of proteins that are destined for use within the cell.
Correct C. The ER is involved in the synthesis of proteins that are destined for secretion.
D. The ER is a type of organelle found in both prokaryotic and eukaryotic cells.

Correct Answer: C

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Question 7
In a population of 1000 individuals, 300 are heterozygous for a particular gene, 400 are homozygous dominant, and 300 are homozygous recessive. What is the frequency of the recessive allele?
A. 0.3
B. 0.4
C. 0.5
Correct D. 0.6

Correct Answer: D

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Question 8
A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?
Correct A. Photosynthesis
B. Respiration
C. Transpiration
D. Osmosis

Correct Answer: A

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Question 9
A diagram of a human respiratory system is shown below. What is the function of the structure labeled 'B'?
Correct A. Exchange of oxygen and carbon dioxide
B. Filtering of blood
C. Production of mucus
D. Regulation of body temperature

Correct Answer: A

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Question 10
A diagram of a human nervous system is shown below. What is the function of the structure labeled 'C'?
Correct A. Transmission of nerve impulses
B. Production of hormones
C. Regulation of body temperature
D. Filtering of blood

Correct Answer: A

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Question 11
In the context of tissue organization, what is the primary function of the basement membrane?
A. To provide structural support to the epithelial cells
Correct B. To facilitate the exchange of nutrients and waste products between the epithelial cells and the underlying connective tissue
C. To act as a barrier against pathogens and toxins
D. To regulate the movement of cells and tissues during development and repair

Correct Answer: B

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Question 12
A patient presents with symptoms of a bacterial infection. Which of the following is a characteristic feature of bacterial cell walls?
A. The presence of a nuclear membrane
Correct B. The presence of a cell wall composed of peptidoglycan
C. The presence of flagella
D. The presence of a large amount of cytoplasm

Correct Answer: B

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Question 13
A diagram of the human circulatory system is shown below. What is the function of the pulmonary artery?
A. To carry oxygenated blood from the lungs to the heart
Correct B. To carry deoxygenated blood from the heart to the lungs
C. To carry oxygenated blood from the heart to the body
D. To carry deoxygenated blood from the body to the heart

Correct Answer: B

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Question 14
A diagram of the human reproductive system is shown below. What is the function of the epididymis?
Correct A. To store sperm before ejaculation
B. To transport sperm from the testes to the penis
C. To produce sperm
D. To regulate the temperature of the testes

Correct Answer: A

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Question 15
A diagram of the human genetic code is shown below. What is the function of the promoter region?
Correct A. To bind to the transcription factor and initiate transcription
B. To bind to the RNA polymerase and initiate transcription
C. To regulate the expression of the gene
D. To provide a binding site for the transcription factor

Correct Answer: A

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Question 16
In the context of xylem transport, what is the primary function of the pit membrane?
A. To regulate water flow between adjacent tracheary elements
Correct B. To facilitate the passage of solutes and water between adjacent tracheary elements
C. To prevent the collapse of tracheary elements
D. To provide mechanical support to the plant

Correct Answer: B

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Question 17
A 2.5 L solution of 0.5 M glu\cose is diluted to 5 L. What is the new concentration of glu\cose?
Correct A. 0.25 M
B. 0.5 M
C. 1 M
D. 1.25 M

Correct Answer: A

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Question 18
In the process of cellular respiration, what is the primary function of the electron transport chain?
Correct A. To generate ATP through the process of chemiosmosis
B. To produce NADH and FADH2
C. To oxidize glu\cose
D. To reduce oxygen

Correct Answer: A

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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?
Correct A. 1600
B. 1200
C. 800
D. 400

Correct Answer: A

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Question 20
A 1.5 L solution of 0.2 M NaCl is diluted to 3 L. What is the new concentration of NaCl?
Correct A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: A

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Question 21
In a tropical rainforest e\cosystem, the primary consumers are primarily herbivores that feed on the abundant plant life. However, some primary consumers are known to be carnivorous, feeding on smaller animals. Which of the following best describes the relationship between the primary consumers and the producers in this e\cosystem?
A. Decomposers break down dead plants and animals, relea\sing nutrients back into the soil.
Correct B. Herbivores feed on producers, while carnivores feed on herbivores.
C. Producers undergo photosynthesis to produce glu\cose, which is consumed by herbivores.
D. Decomposers feed on dead plants and animals, relea\sing nutrients back into the soil.

Correct Answer: B

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Question 22
A species of bird has a unique mating ritual where the male bird builds a complex nest u\sing twigs and leaves. The female bird then selects the nest based on its complexity and chooses the male bird that built it. What type of selection is this an example of?
A. Natural selection
B. Artificial selection
Correct C. Sexual selection
D. Genetic drift

Correct Answer: C

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Question 23
In a cell, the process of mitosis involves the replication of DNA and the separation of chromosomes into two daughter cells. What is the purpose of the interphase stage in mitosis?
Correct A. To replicate DNA and prepare for cell division
B. To separate chromosomes and form two daughter cells
C. To synthesize proteins and prepare for cell growth
D. To degrade cellular components and prepare for cell death

Correct Answer: A

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Question 24
In the human kidney, the process of filtration involves the movement of waste products from the blood into the nephrons. What is the primary mechanism responsible for this movement?
A. Osmosis
B. Diffusion
Correct C. Active transport
D. Passive transport

Correct Answer: C

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Question 25
In a population of rabbits, the frequency of the dominant allele for fur color is 0.6, while the frequency of the recessive allele is 0.4. What is the expected frequency of the heterozygous genotype in the population?
A. 0.2
Correct B. 0.4
C. 0.6
D. 0.8

Correct Answer: B

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