POST UTME UNILORIN 2025 Biology | Objective

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
B. 200
C. 400
D. 500
Question 2
A diagram of a human eye is shown below. What is the function of the part labeled 'B'?
A. To focus light
B. To detect light
C. To regulate pupil size
D. To produce tears
Question 3
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
C. Removal of waste products from the body
D. Production of hormones
Question 4
In the human eye, what is the primary function of the retina?
A. To focus light onto the lens
B. To convert light into electrical signals
C. To regulate the amount of light entering the eye
D. To produce hormones that control growth and development
Question 5
The diagram below shows the structure of a plant cell. Which of the following is a function of the chloroplast?
A. Photosynthesis
B. Respiration
C. Protein synthesis
D. Fatty acid synthesis
Question 6
In the xylem of a plant, what is the primary function of the tracheids?
A. Transport of water and minerals from the roots to the leaves
B. Transport of sugars and other organic compounds from the leaves to the roots
C. Storage of water and nutrients in the plant
D. Support and structure for the plant
Question 7
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
B. From the outside to the inside
C. Equal in both directions
D. Dep\endent on the concentration gradient
Question 8
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
B. The cell will shrink and lose water
C. The cell will remain unchanged
D. The cell will undergo mitosis
Question 9
A diagram shows a cross-section of a liver cell. Which of the following structures is responsible for the storage of glycogen?
A. A
B. B
C. C
D. D
Question 10
A plant cell has a cell wall composed of cellulose. What is the primary function of this cell wall?
A. To provide structural support
B. To regulate water uptake
C. To facilitate cell division
D. To store nutrients
Question 11
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
C. Oxidative phosphorylation
D. Fatty acid synthesis
Question 12
In asexual reproduction, what is the primary mechanism by which genetic variation is introduced?
A. Mutation
B. Genetic recombination
C. Gene duplication
D. Gene deletion
Question 13
What is the term for the process by which an organism's genetic information is passed from one generation to the next?
A. Mutation
B. Genetic drift
C. Natural selection
D. Heritability
Question 14
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
C. To control voluntary movements
D. To produce hormones
Question 15
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
B. Competition for resources
C. Disease
D. Genetic drift

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