POST UTME NOUN 2025 Biology | Objective

Are you preparing for POST UTME NOUN 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 population of 1000 individuals, 70% are heterozygous for the gene controlling the ABO blood type. If 10% of the population are type A, 20% are type B, and 70% are type AB, what is the probability that two randomly selected individuals will both be type A?
Correct A. 0.01
B. 0.1
C. 0.2
D. 0.5

Correct Answer: A

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Question 2
A 2.5 L flask contains 0.5 M glu\cose solution. If 10 mL of 1 M HCl is added to the solution, what is the new concentration of glu\cose?
A. 0.45 M
Correct B. 0.5 M
C. 0.55 M
D. 0.6 M

Correct Answer: B

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Question 3
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 4
A 50-year-old man has been experiencing symptoms of chronic kidney disease. His serum creatinine level is 3.5 mg/dL, and his glomerular filtration rate (GFR) is 20 mL/min. What is the likely cause of his kidney dysfunction?
Correct A. Diabetes mellitus
B. Hypertension
C. Chronic obstructive pulmonary disease (COPD)
D. Rheumatoid arthritis

Correct Answer: A

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Question 5
A diagram of a human eye is shown below. What is the function of the structure labeled 'B'?
Correct A. To focus light on the retina
B. To detect light intensity
C. To regulate pupil size
D. To produce tears

Correct Answer: A

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Question 6
In a tropical rainforest e\cosystem, what is the primary mechanism by which nutrients are cycled from dead organisms to living ones?
Correct A. Decomposition by fungi and bacteria
B. Uptake by plant roots
C. Release by insect larvae
D. Exchange through symbiotic relationships

Correct Answer: A

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Question 7
In a human cell, what is the primary function of the Golgi apparatus?
A. Protein synthesis
B. Cell signaling
C. Lipid metabolism
Correct D. Protein modification and transport

Correct Answer: D

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Question 8
In a population of rabbits, what is the term for the rate at which the population increases or decreases?
A. Growth rate
B. Birth rate
C. Death rate
Correct D. Intrinsic rate of increase

Correct Answer: D

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Question 9
In a plant cell, what is the primary function of the mitochondria?
A. Photosynthesis
B. Cell signaling
C. Lipid metabolism
Correct D. Cellular respiration

Correct Answer: D

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Question 10
In a human body, what is the term for the process by which the body maintains a stable internal environment despite changes in the external environment?
Correct A. Homeostasis
B. Regulation
C. Adaptation
D. Acclimation

Correct Answer: A

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Question 11
In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' for black body color is 0.2. If the population is in Hardy-Weinberg equilibrium, calculate the frequency of the homozygous dominant genotype 'B'B.
Correct A. 0.36
B. 0.64
C. 0.16
D. 0.84

Correct Answer: A

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Question 12
A 2.5 L solution of 0.1 M NaCl is diluted to 5 L. Calculate the new concentration of NaCl in the solution.
Correct A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.25 M

Correct Answer: A

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Question 13
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'Rr'?
A. 0.25
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

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Question 14
A 50 mL sample of 0.5 M HCl is added to 100 mL of 0.1 M NaOH. Calculate the concentration of the resulting solution.
Correct A. 0.033 M
B. 0.066 M
C. 0.1 M
D. 0.133 M

Correct Answer: A

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Question 15
A population of bacteria is growing exponentially with a growth rate of 0.2 per hour. If the initial population is 1000, calculate the population after 3 hours.
A. 2000
Correct B. 4000
C. 6000
D. 8000

Correct Answer: B

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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'?
Correct A. 0.64
B. 0.36
C. 0.16
D. 0.04

Correct Answer: A

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Question 17
A cell is in the G2 phase of the cell cycle. If the cell is treated with a drug that prevents the cell from entering mitosis, what will happen to the cell?
Correct A. The cell will undergo programmed cell death.
B. The cell will continue to grow and divide.
C. The cell will enter the G1 phase.
D. The cell will remain in the G2 phase.

Correct Answer: A

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Question 18
A diagram shows a plant with 5 petals on each flower. If the plant is crossed with a plant that has 3 petals on each flower, what is the probability that the offspring will have 4 petals on each flower?
Correct A. 0.5
B. 0.25
C. 0.75
D. 0.33

Correct Answer: A

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Question 19
A diagram shows a simple harmonic motion graph. If the graph is shifted 2 units to the right, what will happen to the amplitude of the graph?
A. The amplitude will increase.
B. The amplitude will decrease.
Correct C. The amplitude will remain the same.
D. The amplitude will become negative.

Correct Answer: C

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Question 20
A diagram shows a titration setup. If the burette contains 0.1 M HCl and the flask contains 0.1 M NaOH, what is the pH of the solution after 10 mL of HCl has been added?
Correct A. 7
B. 10
C. 12
D. 14

Correct Answer: A

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Question 21
The process of meiosis results in the production of four haploid cells from a diploid cell. Which of the following is a characteristic of these haploid cells?
A. They have the same number of chromosomes as the parent cell
Correct B. They have half the number of chromosomes as the parent cell
C. They have a different number of chromosomes than the parent cell
D. They are all genetically identical

Correct Answer: B

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Question 22
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. Nucleus
D. Vacuole

Correct Answer: B

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Question 23
A population of rabbits is growing exponentially. Which of the following is a characteristic of the population growth curve?
A. The population grows at a cons\tant rate
Correct B. The population grows exponentially
C. The population grows linearly
D. The population remains cons\tant

Correct Answer: B

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Question 24
A bio\logist is studying the process of mitosis. Which of the following stages is characterized by the condensation of chromosomes?
Correct A. Prophase
B. Metaphase
C. Anaphase
D. Telophase

Correct Answer: A

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Question 25
A population of bacteria is growing in a controlled environment. Which of the following is a characteristic of the population growth curve?
A. The population grows at a cons\tant rate
Correct B. The population grows exponentially
C. The population grows linearly
D. The population remains cons\tant

Correct Answer: B

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