POST UTME UNIPORT 2025 Biology | Objective

Are you preparing for POST UTME UNIPORT 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.

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Question 1
A patient with a rare genetic disorder has a mutation in the HFE gene, leading to an accumulation of iron in the body. Which of the following organs is most likely to be affected by this condition?
Correct A. Liver
B. Kidneys
C. Pancreas
D. Heart

Correct Answer: A

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Question 2
In a population of 1000 individuals, 50% have the genotype BB, 30% have the genotype Bb, and 20% have the genotype bb. What is the frequency of the B allele?
A. 0.4
Correct B. 0.5
C. 0.6
D. 0.7

Correct Answer: B

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Question 3
A diagram of the human nervous system is shown below. Which of the following nerves is responsible for transmitting sensory information from the skin to the brain?
Correct A. A
B. B
C. C
D. D

Correct Answer: A

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Question 4
A diagram of the human excretory system is shown below. Which of the following organs is responsible for filtering waste from the blood?
Correct A. A
B. B
C. C
D. D

Correct Answer: A

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Question 5
A diagram of the human circulatory system is shown below. Which of the following vessels is responsible for carrying oxygenated blood from the lungs to the heart?
Correct A. A
B. B
C. C
D. D

Correct Answer: A

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Question 6
In the context of osmoregulation, what is the primary function of the hypothalamus in regulating water balance in the body?
Correct A. To produce antidiuretic hormone (ADH)
B. To regulate thirst
C. To control blood pressure
D. To manage electrolyte balance

Correct Answer: A

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Question 7
A researcher is studying the effect of pH on the growth of E. coli bacteria. Which of the following statements is true regarding the optimal pH range for E. coli growth?
A. pH 6.0-7.0
Correct B. pH 7.0-8.0
C. pH 8.0-9.0
D. pH 9.0-10.0

Correct Answer: B

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Question 8
A geneticist is studying the inheri\tance of a trait in a family. Which of the following genetic patterns is consistent with an autosomal dominant inheri\tance pattern?
Correct A. A dominant allele (A) will always be expressed over a recessive allele (a)
B. A dominant allele (A) will always be expressed over a dominant allele (A)
C. A recessive allele (a) will always be expressed over a dominant allele (A)
D. A dominant allele (A) will always be expressed over a dominant allele (A)

Correct Answer: A

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Question 9
A bio\logist is studying the structure of a plant cell. Which of the following organelles is responsible for photosynthesis?
A. Mitochondria
Correct B. Chloroplast
C. Endoplasmic Reticulum
D. Lysosome

Correct Answer: B

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Question 10
A researcher is studying the effect of temperature on the growth of a microorganism. Which of the following statements is true regarding the optimal temperature range for microbial growth?
A. Temperature 20-30°C
Correct B. Temperature 30-40°C
C. Temperature 40-50°C
D. Temperature 50-60°C

Correct Answer: B

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Question 11
In a photosynthetic pathway, which enzyme catalyzes the conversion of CO2 to a 3-carbon molecule?
Correct A. RuBisCO
B. PEPC
C. Phosphoglycerate kinase
D. Fructose-1,6-bisphosphatase

Correct Answer: A

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Question 12
A 30-year-old male patient presents with symptoms of hypogonadism. Which hormone is most likely responsible for this condition?
A. FSH
Correct B. LH
C. Testosterone
D. Prolactin

Correct Answer: B

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Question 13
A 25-year-old female patient undergoes a surgical procedure to remove a tumor from her ovary. Which type of cell division is most likely to occur in the remaining ovarian tissue?
A. Mitosis
Correct B. Meiosis
C. Apoptosis
D. Endoreduplication

Correct Answer: B

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Question 14
A 40-year-old male patient presents with symptoms of hypertension. Which hormone is most likely responsible for this condition?
A. Renin
B. Aldosterone
Correct C. Angioten\sin II
D. Antidiuretic hormone

Correct Answer: C

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Question 15
A 35-year-old female patient undergoes a surgical procedure to remove a tumor from her kidney. Which type of cell division is most likely to occur in the remaining renal tissue?
Correct A. Mitosis
B. Meiosis
C. Apoptosis
D. Endoreduplication

Correct Answer: A

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Question 16
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'?
A. 0.36
Correct B. 0.64
C. 0.72
D. 0.88

Correct Answer: B

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Question 17
A 2.5-g sample of a compound containing only carbon and hydrogen is burned in a combustion chamber. The volume of carbon dioxide produced is 2.1 liters at 25°C and 1 atm. What is the empirical formula of the compound?
Correct A. CH
B. C2H4
C. C3H6
D. C4H8

Correct Answer: A

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Question 18
A population of rabbits is growing according to the \logistic growth model. If the initial population size is 100, the carrying capacity is 1000, and the growth rate is 0.5, what is the population size after 5 years?
A. 500
B. 750
Correct C. 850
D. 950

Correct Answer: C

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Question 19
A 10-mL sample of a solution containing 0.1 M NaCl is mixed with 20 mL of a solution containing 0.2 M KNO3. What is the concentration of Cl- ions in the resulting solution?
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 20
A 5-g sample of a compound containing only carbon and hydrogen is burned in a combustion chamber. The volume of carbon dioxide produced is 1.5 liters at 25°C and 1 atm. What is the molecular formula of the compound?
Correct A. C2H4
B. C3H6
C. C4H8
D. C5H10

Correct Answer: A

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Question 21
In a eukaryotic cell, the \endoplasmic reticulum 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?
A. The \endoplasmic reticulum is a type of organelle found in prokaryotic cells.
B. The \endoplasmic reticulum is involved in the synthesis of proteins that are destined for use within the cell.
C. The \endoplasmic reticulum is a type of organelle found in eukaryotic cells.
Correct D. The \endoplasmic reticulum is involved in the synthesis of proteins that are destined for secretion.

Correct Answer: D

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Question 22
A population of a species is said to be in a state of eco\logical balance when the number of individuals remains relatively cons\tant over time. Which of the following factors can contribute to this balance?
A. Predation
B. Competition
C. Mutualism
Correct D. All of the above

Correct Answer: D

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Question 23
In a typical e\cosystem, the following organisms are found in a freshwater lake:
A. Algae, Zooplankton, Bacteria
Correct B. Phytoplankton, Zooplankton, Bacteria
C. Phytoplankton, Zooplankton, Algae
D. Bacteria, Algae, Zooplankton

Correct Answer: B

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Question 24
A species is said to be extinct when its last individual dies. Which of the following statements is TRUE?
A. A species is said to be extinct when its population size decreases.
B. A species is said to be extinct when its population size increases.
Correct C. A species is said to be extinct when its last individual dies.
D. A species is said to be extinct when its population size remains cons\tant.

Correct Answer: C

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Question 25
In a typical e\cosystem, the following organisms are found in a terrestrial e\cosystem:
Correct A. Trees, Grasses, Fungi
B. Grasses, Trees, Fungi
C. Fungi, Trees, Grasses
D. Trees, Fungi, Grasses

Correct Answer: A

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