POST UTME UNILORIN 2025 Biology | Objective

Are you preparing for POST UTME UNILORIN 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 E. coli, the frequency of the gene for ampicillin resis\tance is 0.2. If 1000 bacteria are plated on agar containing ampicillin, how many are expected to be resis\tant?
A. 100
Correct B. 200
C. 400
D. 500

Correct Answer: B

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Question 2
A plant with the genotype AaBbCcc is crossed with a plant with the genotype AAbbCC. What is the probability that the offspring will have the genotype AaBbCc?
A. 0.25
Correct B. 0.5
C. 0.75
D. 1

Correct Answer: B

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Question 3
A diagram of a plant cell is shown below. What is the function of the part labeled 'A'?
Question 4
The process of meiosis results in the production of four haploid daughter cells from a diploid parent cell. Which of the following is a characteristic of the daughter cells produced during meiosis?
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 mix of maternal and paternal chromosomes
D. They have a different ploidy level than the parent cell

Correct Answer: B

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Question 5
The diagram below shows the structure of a mitochondrion. Which of the following is a function of the cristae?
A. Protein synthesis
B. Electron transport
Correct C. Oxidative phosphorylation
D. Fatty acid synthesis

Correct Answer: C

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Question 6
The process of excretion in humans involves the removal of waste products from the body. Which of the following is a function of the kidneys?
A. Regulation of blood pressure
B. Maintenance of electrolyte balance
Correct C. Removal of waste products from the body
D. Production of hormones

Correct Answer: C

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Question 7
The Hardy-Weinberg principle states that the frequency of alleles in a population remains cons\tant from generation to generation in the absence of genetic drift, mutation, and gene flow. Which of the following is a consequence of the Hardy-Weinberg principle?
A. The frequency of alleles in a population increases over time
Correct B. The frequency of alleles in a population remains cons\tant over time
C. The frequency of alleles in a population decreases over time
D. The frequency of alleles in a population is affected by genetic drift

Correct Answer: B

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Question 8
The diagram below shows the structure of a plant cell. Which of the following is a function of the chloroplast?
Correct A. Photosynthesis
B. Respiration
C. Protein synthesis
D. Fatty acid synthesis

Correct Answer: A

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Question 9
In asexual reproduction, what is the primary mechanism by which genetic variation is introduced?
A. Mutation
Correct B. Genetic recombination
C. Gene duplication
D. Gene deletion

Correct Answer: B

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Question 10
A population of rabbits is introduced to a new habitat. Initially, the population grows exponentially, but eventually, the growth rate slows down. What is the likely cause of this slowdown?
A. Predation
Correct B. Competition for resources
C. Disease
D. Genetic drift

Correct Answer: B

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Question 11
A plant cell has a cell wall composed of cellulose. What is the primary function of this cell wall?
Correct A. To provide structural support
B. To regulate water uptake
C. To facilitate cell division
D. To store nutrients

Correct Answer: A

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Question 12
A neuron has a resting potential of -70 mV. What is the direction of the electrical gradient across the cell membrane?
A. From the inside to the outside
Correct B. From the outside to the inside
C. Equal in both directions
D. Dep\endent on the concentration gradient

Correct Answer: B

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Question 13
A diagram of a plant cell is shown below. What is the function of the organelle labeled 'A'?
A. To synthesize proteins
Correct B. To store genetic information
C. To regulate cell growth
D. To transport materials

Correct Answer: B

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Question 14
A diagram of a human eye is shown below. What is the function of the part labeled 'B'?
A. To focus light
Correct B. To detect light
C. To regulate pupil size
D. To produce tears

Correct Answer: B

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Question 15
A diagram of a human brain is shown below. What is the function of the part labeled 'C'?
A. To process sensory information
B. To regulate body temperature
Correct C. To control voluntary movements
D. To produce hormones

Correct Answer: C

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Question 16
In a typical xylem vessel, what is the primary function of the lignin-rich secondary cell wall?
Correct A. To provide mechanical strength and support to the vessel
B. To facilitate the transport of water and minerals
C. To regulate the rate of transpiration
D. To store starch and other reserve materials

Correct Answer: A

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Question 17
A 2.5-g sample of a subs\tance is dissolved in 25 mL of water. If the resulting solution has a concentration of 0.1 M, what is the molar mass of the subs\tance?
A. 25 g/mol
Correct B. 50 g/mol
C. 100 g/mol
D. 200 g/mol

Correct Answer: B

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Question 18
In a typical human cell, what is the primary function of the Golgi apparatus?
A. To synthesize proteins and lipids
Correct B. To modify and package proteins and lipids
C. To transport materials between the ER and the plasma membrane
D. To store starch and other reserve materials

Correct Answer: B

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Question 19
A plant cell is placed in a solution with a pH of 5.5. If the cell membrane has a pH-dep\endent permeability, what will happen to the cell?
A. The cell will swell and burst
Correct B. The cell will shrink and lose water
C. The cell will remain unchanged
D. The cell will undergo mitosis

Correct Answer: B

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Question 20
A 5.0-mL sample of a solution is diluted to 50 mL. If the initial concentration is 0.2 M, what is the final concentration?
A. 0.01 M
Correct B. 0.02 M
C. 0.04 M
D. 0.08 M

Correct Answer: B

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Question 21
The process of osmoregulation in plants involves the movement of water across the plasma membrane. Which of the following statements is true about this process?
A. Water moves from the cell to the surrounding environment through the process of osmosis.
B. Water moves from the surrounding environment into the cell through the process of \endosmosis.
Correct C. Water moves from the cell to the surrounding environment through the process of exosmosis.
D. Water moves from the surrounding environment into the cell through the process of exosmosis.

Correct Answer: C

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Question 22
A diagram of a plant cell is shown below. Which of the following organelles is responsible for photosynthesis?
A. Mitochondrion
Correct B. Chloroplast
C. Vacuole
D. Nucleus

Correct Answer: B

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Question 23
A diagram of a microorganism is shown below. Which of the following statements is true about this microorganism?
Correct A. It is a type of bacteria.
B. It is a type of virus.
C. It is a type of fungus.
D. It is a type of protozoa.

Correct Answer: A

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Question 24
A diagram of a cell is shown below. Which of the following organelles is responsible for protein synthesis?
A. Mitochondrion
B. Nucleus
Correct C. Ribosome
D. Endoplasmic reticulum

Correct Answer: C

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Question 25
A diagram of a plant is shown below. Which of the following statements is true about this plant?
A. It is a type of monocot.
Correct B. It is a type of dicot.
C. It has a taproot.
D. It has a fibrous root system.

Correct Answer: B

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