POST UTME UNIOSUN 2025 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 2025 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In a tropical rainforest e\cosystem, what is the primary role of the emergent layer?
A. To provide shade and shelter for animals
B. To intercept and block sunlight, reducing photosynthesis
C. To support a diverse array of epiphytes and vines
Correct D. To create a microclimate with high humidity and temperature

Correct Answer: D

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Question 2
A 35-year-old woman presents with a 2-year history of progressive hearing loss. On examination, her tympanic membrane is normal, but her Weber test is lateralized to the affected ear. What is the most likely diagnosis?
Correct A. Sensorineural hearing loss due to otosclerosis
B. Conductive hearing loss due to otitis media
C. Mixed hearing loss due to Meniere's disease
D. Presbycusis

Correct Answer: A

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Question 3
A 25-year-old man is brought to the emergency department with a 2-hour history of severe abdominal pain. On examination, his blood pressure is 80/40 mmHg, and his pulse is 120 beats per minute. What is the most likely diagnosis?
A. Acute app\endicitis
B. Acute cholecystitis
C. Hemorrhagic pancreatitis
Correct D. Spon\taneous rupture of the spleen

Correct Answer: D

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Question 4
A 40-year-old woman presents with a 5-year history of progressive shortness of breath. On examination, her oxygen saturation is 85% on room air, and her lung fields are clear. What is the most likely diagnosis?
A. Chronic obstructive pulmonary disease (COPD)
B. Pulmonary embolism
C. Pneumonia
Correct D. Pulmonary hypertension

Correct Answer: D

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Question 5
A 30-year-old man is brought to the emergency department with a 2-hour history of severe headache and confusion. On examination, his blood pressure is 180/100 mmHg, and his pulse is 100 beats per minute. What is the most likely diagnosis?
Correct A. Subarachnoid hemorrhage
B. Intracerebral hemorrhage
C. Meningitis
D. Encephalitis

Correct Answer: A

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Question 6
In a population of 1000 individuals, the frequency of the dominant allele is 0.6. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the recessive allele?
Correct A. 0.4
B. 0.2
C. 0.8
D. 0.1

Correct Answer: A

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Question 7
A plant with a mutation in the gene encoding the enzyme RuBisCO has a 50% reduction in photosynthetic rate. If the plant is grown in a controlled environment with a CO2 concentration of 400 ppm, what is the new rate of photosynthesis?
A. 50% of original rate
Correct B. 75% of original rate
C. 25% of original rate
D. 0% of original rate

Correct Answer: B

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Question 8
A 2-year-old child is brought to the doctor with symptoms of malnutrition. The child's hemoglobin level is 8 g/dL. What is the most likely cause of this condition?
Correct A. Iron deficiency anemia
B. Vitamin B12 deficiency
C. Folate deficiency
D. Zinc deficiency

Correct Answer: A

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Question 9
A 30-year-old woman is diagnosed with hypertension. Her blood pressure is 160/100 mmHg. What is the most likely cause of this condition?
A. Genetic predisposition
B. Sedentary lifestyle
Correct C. High sodium diet
D. Kidney disease

Correct Answer: C

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Question 10
A 40-year-old man is diagnosed with type 2 diabetes. His fasting blood glu\cose level is 250 mg/dL. What is the most likely cause of this condition?
Correct A. Insulin resis\tance
B. Pancreatic \beta-cell dysfunction
C. Genetic predisposition
D. Obesity

Correct Answer: A

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Question 11
In a population of 1000 individuals, 70% are heterozygous for the ABO blood group system. If 20% of the population is type A, 40% is type B, and 30% is type AB, what is the frequency of the i allele?
A. 0.25
Correct B. 0.3
C. 0.35
D. 0.4

Correct Answer: B

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Question 12
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth rate of the bacteria at different pH levels and plots the data on a graph. If the growth rate is highest at pH 7 and lowest at pH 5, what is the most likely explanation for this tr\end?
Correct A. The bacteria are more sensitive to acidic environments.
B. The bacteria are more sensitive to basic environments.
C. The bacteria are more sensitive to high temperatures.
D. The bacteria are more sensitive to low temperatures.

Correct Answer: A

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Question 13
A cell is placed in a solution with a concentration of 0.1 M glu\cose. If the cell is permeable to glu\cose, what is the concentration of glu\cose inside the cell after 10 minutes?
Correct A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: A

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Question 14
A population of 1000 individuals is divided into 10 groups of 100 individuals each. If 20% of the individuals in each group are type A, what is the probability that a randomly selected individual is type A?
Correct A. 0.02
B. 0.04
C. 0.06
D. 0.08

Correct Answer: A

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Question 15
A researcher is studying the effect of temperature on the growth of a microorganism. The researcher measures the growth rate of the microorganism at different temperatures and plots the data on a graph. If the growth rate is highest at 37°C and lowest at 25°C, what is the most likely explanation for this tr\end?
A. The microorganism is more sensitive to cold temperatures.
Correct B. The microorganism is more sensitive to hot temperatures.
C. The microorganism is more sensitive to high humidity.
D. The microorganism is more sensitive to low humidity.

Correct Answer: B

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Question 16
In a tropical rainforest e\cosystem, the primary consumers are primarily composed of which of the following groups?
Correct A. Herbivorous insects
B. Fruit-eating bats
C. Fungi-feeding nematodes
D. Carnivorous spiders

Correct Answer: A

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Question 17
A species of bird has a beak shape that is well-suited for cracking open seeds. This is an example of which of the following types of adaptations?
A. Mimicry
B. Camouflage
Correct C. Specialized feeding structure
D. Migration pattern

Correct Answer: C

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Question 18
In a photosynthetic pathway, the light-dep\endent reactions occur in which of the following parts of the chloroplast?
A. Stroma
Correct B. Thylakoid membrane
C. Chloroplast envelope
D. Grana stack

Correct Answer: B

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Question 19
A cell in the process of mitosis is in which of the following stages?
Correct A. Prophase
B. Metaphase
C. Anaphase
D. Telophase

Correct Answer: A

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Question 20
In a human body, the system responsible for maintaining homeostasis and regulating body temperature is the?
A. Nervous system
B. Circulatory system
C. Respiratory system
Correct D. Endocrine system

Correct Answer: D

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Question 21
In the context of tissue organization, what is the primary function of the basement membrane?
A. To provide structural support to the tissue
B. To facilitate the exchange of nutrients and waste products
Correct C. To regulate the movement of cells and molecules
D. To produce extracellular matrix components

Correct Answer: C

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Question 22
A 35-year-old woman presents with a 2-year history of progressive dyspnea and fatigue. Her chest X-ray shows a large, homogeneous mass in the right lung. What is the most likely diagnosis?
A. Pulmonary embolism
Correct B. Lung cancer
C. Pneumonia
D. Pulmonary edema

Correct Answer: B

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Question 23
A 25-year-old man is involved in a high-speed motor vehicle accident. He is rushed to the emergency department, where he is found to have a severe head injury. What is the primary concern in this patient's management?
A. To manage the patient's pain
Correct B. To prevent further injury to the brain
C. To stabilize the patient's vital signs
D. To perform a surgical intervention

Correct Answer: B

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Question 24
A 30-year-old woman presents with a 6-month history of progressive weakness and fatigue. Her physical examination reveals a palpable goiter. What is the most likely diagnosis?
A. Thyroiditis
B. Thyroid cancer
C. Hyperthyroidism
Correct D. Hypothyroidism

Correct Answer: D

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Question 25
A 40-year-old man presents with a 1-year history of progressive shortness of breath and fatigue. His chest X-ray shows a large, homogeneous mass in the left lung. What is the most likely diagnosis?
A. Pulmonary embolism
Correct B. Lung cancer
C. Pneumonia
D. Pulmonary edema

Correct Answer: B

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