POST UTME BSU 2025 Biology | Objective

Are you preparing for POST UTME BSU 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 the context of classification of living things, what is the primary function of the kingdom level?
Correct A. To group organisms based on their cell structure
B. To group organisms based on their genetic makeup
C. To group organisms based on their body structure
D. To group organisms based on their habitat

Correct Answer: A

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Question 2
A diagram of a human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 3
In the context of eco\logy, what is the term for the process by which plants convert sunlight into energy?
Correct A. Photosynthesis
B. Respiration
C. Decomposition
D. Fermentation

Correct Answer: A

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Question 4
A diagram of a human nervous system is shown below. Which part of the nervous system is responsible for controlling voluntary movements?
Correct A. Cerebrum
B. Cerebellum
C. Brainstem
D. Spinal cord

Correct Answer: A

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Question 5
In the context of classification of living things, what is the primary function of the species level?
Correct A. To group organisms based on their genetic makeup
B. To group organisms based on their cell structure
C. To group organisms based on their body structure
D. To group organisms based on their habitat

Correct Answer: A

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Question 6
In a typical xylem vessel, what is the primary function of the lignin-rich secondary cell wall?
Correct A. To provide structural support to the vessel
B. To facilitate the transport of water and minerals
C. To regulate the rate of water uptake by the roots
D. To store and transport sugars produced during photosynthesis

Correct Answer: A

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Question 7
What is the primary mechanism by which the root hair cells increase the surface area for absorption?
A. By increa\sing the number of mitochondria
B. By increa\sing the number of vacuoles
Correct C. By increa\sing the surface area through the formation of root hairs
D. By increa\sing the rate of transpiration

Correct Answer: C

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Question 8
In a typical plant cell, what is the primary function of the Golgi apparatus?
A. To synthesize proteins
B. To synthesize lipids
Correct C. To modify and package proteins and lipids for transport
D. To synthesize carbohydrates

Correct Answer: C

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Question 9
What is the primary mechanism by which the stomata regulate gas exchange?
A. By increa\sing the rate of transpiration
B. By increa\sing the rate of photosynthesis
Correct C. By regulating the rate of gas exchange through the opening and clo\sing of stomata
D. By increa\sing the rate of respiration

Correct Answer: C

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Question 10
In a typical e\cosystem, what is the primary function of the decomposers?
A. To synthesize nutrients from inorganic compounds
Correct B. To break down organic matter into simpler compounds
C. To regulate the population size of other organisms
D. To produce oxygen through photosynthesis

Correct Answer: B

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Question 11
In the context of sense organs, what is the primary function of the olfactory epithelium?
A. To detect changes in air pressure
B. To detect changes in temperature
Correct C. To detect odor molecules
D. To detect sound waves

Correct Answer: C

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Question 12
A patient is diagnosed with a bacterial infection. The bacteria are gram-positive and have a characteristic 'safety pin' appearance under the microscope. What is the most likely cause of the infection?
Correct A. Staphylococcus aureus
B. Streptococcus pneumoniae
C. Escherichia coli
D. Pseudomonas aeruginosa

Correct Answer: A

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Question 13
A person is experiencing difficulty breathing due to a respiratory disease. The person's oxygen saturation is 88% and their carbon dioxide levels are elevated. What is the most likely cause of their symptoms?
Correct A. Chronic obstructive pulmonary disease (COPD)
B. Asthma
C. Pneumonia
D. Lung cancer

Correct Answer: A

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Question 14
A plant is placed in a controlled environment with a cons\tant temperature of 25°C and a relative humidity of 60%. The plant is exposed to a light intensity of 200 μmol/m²s. What is the most likely effect on the plant's photosynthetic rate?
Correct A. Increased
B. Decreased
C. Remains the same
D. Variable

Correct Answer: A

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Question 15
A person is experiencing symptoms of malnutrition, including weight loss and fatigue. Their diet consists mainly of carbohydrates and sugars. What is the most likely cause of their malnutrition?
Correct A. Inadequate protein intake
B. Inadequate calorie intake
C. Inadequate vitamin and mineral intake
D. Inadequate fiber intake

Correct Answer: A

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Question 16
In the context of photosynthesis, which of the following is a byproduct of the light-dep\endent reactions?
A. ATP
Correct B. NADPH
C. O2
D. H2O

Correct Answer: B

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Question 17
A 25-year-old woman presents with a 2-year history of amenorrhea. Her physical examination reveals a BMI of 18.5. Which of the following is the most likely diagnosis?
A. Polycystic Ovary Syndrome (PCOS)
B. Primary Amenorrhea
C. Secondary Amenorrhea
Correct D. Hypothalamic Amenorrhea

Correct Answer: D

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Question 18
A 35-year-old man presents with a 5-year history of erectile dysfunction. His physical examination reveals a BMI of 30. Which of the following is the most likely diagnosis?
A. Diabetes Mellitus
B. Hypertension
C. Hyperlipidemia
Correct D. Obesity

Correct Answer: D

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Question 19
A 20-year-old woman presents with a 2-year history of irregular menstrual cycles. Her physical examination reveals a BMI of 25. Which of the following is the most likely diagnosis?
Correct A. Polycystic Ovary Syndrome (PCOS)
B. Primary Amenorrhea
C. Secondary Amenorrhea
D. Hypothalamic Amenorrhea

Correct Answer: A

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Question 20
A 30-year-old man presents with a 5-year history of infertility. His physical examination reveals a BMI of 35. Which of the following is the most likely diagnosis?
A. Varicocele
Correct B. Low Sperm Count
C. Erectile Dysfunction
D. Hypogonadism

Correct Answer: B

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Question 21
In a photosynthetic pathway, which of the following pigments is primarily responsible for absorbing light energy in the blue-violet region of the visible spectrum?
A. Chlorophyll a
B. Chlorophyll b
C. Carotenoids
Correct D. Phycobiliproteins

Correct Answer: D

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Question 22
A 2.0 L flask contains 0.50 M NaCl at 25°C. What is the total number of moles of gas in the flask after the solution is heated to 50°C?
A. 0.50 mol
B. 1.0 mol
Correct C. 1.5 mol
D. 2.0 mol

Correct Answer: C

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Question 23
A tissue consists of a mixture of two types of cells: epithelial and connective tissue. Which of the following characteristics is unique to epithelial tissue?
Correct A. Polarity
B. Specialization
C. Regeneration
D. Invasiveness

Correct Answer: A

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Question 24
A 0.50 M solution of HCl is mixed with a 0.50 M solution of NaOH. What is the pH of the resulting solution?
A. 0.50
Correct B. 1.0
C. 2.0
D. 3.0

Correct Answer: B

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Question 25
A diagram of the human eye is shown below. Which of the following structures is responsible for detecting light?
A. Cornea
B. Iris
C. Lens
Correct D. Retina

Correct Answer: D

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