POST UTME PAN-ATLANTIC UNIVERSITY 2025 Biology | Objective

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Question 1
In the classification of living things, which of the following kingdoms is characterized by the presence of cell walls made of chitin?
Correct A. Fungi
B. Bacteria
C. Protista
D. Monera

Correct Answer: A

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Question 2
The diagram below shows a cross-section of a plant root. Which of the following is the primary function of the xylem in this region?
Correct A. Transporting water and minerals from the soil to the leaves
B. Storing food for the plant
C. Supporting the structure of the plant
D. Regulating the plant's temperature

Correct Answer: A

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Question 3
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
Correct C. 40 ohms
D. 50 ohms

Correct Answer: C

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Question 4
The diagram below shows a cross-section of a human eye. Which of the following is the primary function of the retina?
A. Focu\sing light onto the retina
Correct B. Detecting light and converting it into electrical signals
C. Regulating the amount of light that enters the eye
D. Supporting the structure of the eye

Correct Answer: B

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Question 5
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
Correct D. 0.5 M

Correct Answer: D

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Question 6
In a population of 1000 individuals, 20% are infected with a disease that has a 5% mortality rate. If 50% of the infected individuals are treated, what is the expected number of deaths?
A. 50
B. 100
Correct C. 200
D. 250

Correct Answer: C

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Question 7
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 concentration of NaOH?
A. 0.40 M
B. 0.50 M
Correct C. 0.60 M
D. 0.70 M

Correct Answer: C

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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
Correct C. 30.0 μL
D. 40.0 μL

Correct Answer: C

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Question 9
A 5.0 g sample of a subs\tance is dissolved in 100.0 mL of water. If the resulting solution has a concentration of 0.50 M, what is the molar mass of the subs\tance?
A. 100.0 g/mol
B. 200.0 g/mol
Correct C. 300.0 g/mol
D. 400.0 g/mol

Correct Answer: C

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Question 10
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
Correct C. 3.0
D. 4.0

Correct Answer: C

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Question 11
In the context of classification of living things, what is the primary function of the kingdom level?
A. To group organisms based on their cell structure
B. To group organisms based on their body symmetry
C. To group organisms based on their metabolic processes
Correct D. To group organisms based on their genetic makeup

Correct Answer: D

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Question 12
Which of the following sense organs is responsible for detecting changes in blood pressure?
A. Eustachian tube
B. Aortic body
C. Carotid body
Correct D. Baroreceptor

Correct Answer: D

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Question 13
In the context of excretion and osmoregulation, what is the primary function of the kidneys?
A. To regulate blood pH levels
B. To regulate blood pressure
C. To regulate electrolyte balance
Correct D. To regulate fluid balance

Correct Answer: D

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Question 14
Which of the following reproductive strategies is characteristic of bacteria?
A. Asexual reproduction
B. Sexual reproduction
Correct C. Binary fission
D. Mitosis

Correct Answer: C

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Question 15
In the context of transport systems, what is the primary function of the xylem?
Correct A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the rest of the plant
C. To transport gases between the leaves and the atmosphere
D. To transport waste products from the leaves to the roots

Correct Answer: A

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Question 16
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
Correct C. C3 pathway
D. Crassulacean acid metabolism pathway

Correct Answer: C

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Question 17
A population of rabbits is introduced to a new island. The population grows rapidly at first, but then slows down as resources become scarce. Which of the following best describes the type of population growth curve that would be observed?
A. Exponential growth
Correct B. Logistic growth
C. Sigmoid growth
D. Linear growth

Correct Answer: B

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Question 18
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
Correct C. Deletion mutation
D. Insertion mutation

Correct Answer: C

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Question 19
A plant is placed in a sealed container with a limited supply of oxygen. Which of the following processes would be most affected by the lack of oxygen?
A. Photosynthesis
Correct B. Respiration
C. Transpiration
D. Translocation

Correct Answer: B

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Question 20
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
Correct C. Resource partitioning niche
D. Niche differentiation niche

Correct Answer: C

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Question 21
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.
Correct 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.

Correct Answer: C

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Question 22
A cell in interphase has a large amount of DNA in its nucleus. Which of the following is a characteristic of this cell?
A. It is in the G1 phase of the cell cycle.
Correct B. It is in the S phase of the cell cycle.
C. It is in the G2 phase of the cell cycle.
D. It is in the M phase of the cell cycle.

Correct Answer: B

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Question 23
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.
Correct 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.

Correct Answer: B

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Question 24
A genetic trait is controlled by a \single gene with two alleles. Which of the following is a possible genotype of an individual with this trait?
A. BB
Correct B. Bb
C. bb
D. BBb

Correct Answer: B

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Question 25
A species of bird has a beak shape that is adapted for cracking open nuts. Which of the following is a likely consequence of this adaptation?
A. The bird will have a larger body size to support the energy demands of nut cracking.
B. The bird will have a specialized digestive system to break down the nutrients in nuts.
Correct C. The bird will have a stronger beak to crack open harder nuts.
D. The bird will have a more efficient respiratory system to support the energy demands of nut cracking.

Correct Answer: C

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