POST UTME PAN-ATLANTIC UNIVERSITY 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a tropical rainforest e\cosystem, the primary producers are plants that undergo photosynthesis. Which of the following is a characteristic of the photosynthetic pathway in these plants?
A. C4 pathway
B. CAM pathway
C. C3 pathway
D. Crassulacean acid metabolism pathway
Question 2
A diagram of the human eye is shown below. What is the function of the structure labeled 'B'?
A. To focus light on the retina
B. To regulate pupil size
C. To detect color
D. To perceive depth
Question 3
The diagram below shows a graph of the relationship between the concentration of oxygen and the rate of respiration in a cell. Which of the following statements is correct about the relationship between the concentration of oxygen and the rate of respiration?
A. The rate of respiration increases as the concentration of oxygen increases.
B. The rate of respiration decreases as the concentration of oxygen increases.
C. The rate of respiration remains cons\tant regardless of the concentration of oxygen.
D. The rate of respiration increases as the concentration of oxygen decreases.
Question 4
The diagram below shows the structure of a mitochondrion. Which of the following statements is correct about the function of the cristae?
A. The cristae increase the surface area of the mitochondrion for gas exchange.
B. The cristae are involved in the synthesis of ATP.
C. The cristae are responsible for the transport of ions across the mitochondrial membrane.
D. The cristae are involved in the breakdown of glu\cose to produce energy.
Question 5
The diagram below shows a cross-section of the human brain. Which of the following structures is responsible for the transmission of nerve impulses from the sensory receptors to the spinal cord?
A. The cerebrum.
B. The cerebellum.
C. The spinal cord.
D. The sensory receptors.
Question 6
The diagram below shows a simple circuit. What is the total resis\tance of the circuit if the resis\tance of each resistor is 10 ohms?
A. 20 ohms
B. 30 ohms
C. 40 ohms
D. 50 ohms
Question 7
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
B. 0.64
C. 0.44
D. 0.56
Question 8
A plant cell has a volume of 10.0 μL and a surface area of 100.0 μm^2. If the cell is subjected to a pressure of 1.0 atm, what is the resulting change in volume?
A. 10.0 μL
B. 20.0 μL
C. 30.0 μL
D. 40.0 μL
Question 9
In a tropical rainforest e\cosystem, the primary consumers are primarily herbivores that feed on the abundant vegetation. Which of the following is a characteristic of these herbivores?
A. They have a large body size to compensate for the low energy content of plant material.
B. They have a high metabolic rate to quickly digest and process plant material.
C. They have a specialized digestive system to break down cellulose in plant cell walls.
D. They have a large liver to store energy-rich compounds from plant material.
Question 10
A gene is identified that codes for a protein involved in the regulation of cell growth. Which of the following types of mutations would most likely result in a loss-of-function phenotype?
A. Point mutation
B. Frameshift mutation
C. Deletion mutation
D. Insertion mutation
Question 11
Which of the following reproductive strategies is characteristic of bacteria?
A. Asexual reproduction
B. Sexual reproduction
C. Binary fission
D. Mitosis
Question 12
A population of rabbits is introduced to a new island with no natural predators. Which of the following is a likely consequence of this introduction?
A. The rabbit population will remain stable and not change over time.
B. The rabbit population will increase rapidly and then stabilize.
C. The rabbit population will decrease rapidly due to overgrazing.
D. The rabbit population will remain small and not affect the island's e\cosystem.
Question 13
The diagram below shows a simple titration setup. What is the concentration of the acid if 25 mL of 0.1 M NaOH is required to neutralize 50 mL of the acid?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 14
A species of bird is known to migrate between two different habitats. Which of the following types of eco\logical niches would best describe the bird's role in the e\cosystem?
A. Competition niche
B. Predator-prey niche
C. Resource partitioning niche
D. Niche differentiation niche
Question 15
A 2.0 L flask contains 0.50 M NaOH. If 20.0 mL of 1.0 M HCl is added to the flask, what is the resulting pH?
A. 1.0
B. 2.0
C. 3.0
D. 4.0

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