POST UTME UNIPORT 2018 Biology | Objective

Are you preparing for POST UTME UNIPORT exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In the xylem transport system, what is the primary function of the xylem parenchyma cells?
A. Storage of nutrients
Correct B. Transport of water and minerals
C. Production of hormones
D. Regulation of water potential

Correct Answer: B

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Question 2
A patient is diagnosed with a bacterial infection caused by Staphylococcus aureus. Which of the following antibiotics is most likely to be effective against this bacterium?
A. Penicillin
B. Erythromycin
Correct C. Vancomycin
D. Tetracycline

Correct Answer: C

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Question 3
A diagram of the human nervous system is shown below. Which of the following nerves is responsible for transmitting sensory information from the skin to the brain?
Correct A. A
B. B
C. C
D. D

Correct Answer: A

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Question 4
A diagram of a plant cell is shown below. Which of the following organelles is responsible for photosynthesis?
Correct A. A
B. B
C. C
D. D

Correct Answer: A

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Question 5
A diagram of a human eye is shown below. Which of the following structures is responsible for detecting light?
A. A
B. B
Correct C. C
D. D

Correct Answer: C

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Question 6
The diagram below represents the structure of a plant cell. Which of the following organelles is responsible for protein synthesis?
A. Mitochondria
B. Nucleus
Correct C. Ribosome
D. Lysosome

Correct Answer: C

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Question 7
A population of bacteria is growing exponentially. If the initial population is 100 and the growth rate is 20% per hour, what will be the population after 3 hours?
A. 1600
B. 2000
Correct C. 2500
D. 3000

Correct Answer: C

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Question 8
The diagram below represents a cross-section of a human eye. Which of the following structures is responsible for adjusting the shape of the lens?
A. Retina
B. Lens
Correct C. Ciliary muscle
D. Iris

Correct Answer: C

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Question 9
A genetic cross is performed between two pea plants, one with the genotype TT and the other with the genotype tt. What is the probability that the offspring will have the genotype Tt?
A. 0.25
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

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Question 10
The diagram below represents a simple circuit. What is the total resis\tance of the circuit?
A. 2Ω
B. 4Ω
Correct C. 6Ω
D. 8Ω

Correct Answer: C

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Question 11
In the context of excretion and osmoregulation, what is the primary function of the kidneys in maintaining acid-base balance?
A. To regulate the concentration of ions in the blood
Correct B. To remove excess hydrogen ions from the body
C. To maintain the pH of the blood
D. To regulate the concentration of glu\cose in the blood

Correct Answer: B

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Question 12
A genetic disorder caused by a mutation in the HBB gene leads to a substitution of glutamic acid for valine at position 6 of the \beta-globin chain. What is the likely effect on the protein structure?
A. The protein will be more stable and have a longer half-life
Correct B. The protein will be less stable and have a shorter half-life
C. The protein will have a change in its secondary structure
D. The protein will have a change in its tertiary structure

Correct Answer: B

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Question 13
A diagram of the human digestive system is shown below. Identify the part labeled 'A'?
A. The small intestine
B. The large intestine
Correct C. The stomach
D. The liver

Correct Answer: C

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Question 14
A population of bacteria is growing exponentially. If the initial population is 100 and the growth rate is 20% per hour, what will be the population after 3 hours?
A. 1000
B. 2000
Correct C. 4000
D. 8000

Correct Answer: C

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Question 15
A diagram of the human eye is shown below. Identify the part labeled 'B'?
A. The lens
Correct B. The cornea
C. The retina
D. The pupil

Correct Answer: B

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Question 16
In a population of 1000 bacteria, 80% are resis\tant to antibiotic A. If 200 bacteria are randomly selected for treatment, what is the probability that at least 60 bacteria are resis\tant to antibiotic A?
A. 0.25
Correct B. 0.30
C. 0.35
D. 0.40

Correct Answer: B

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Question 17
A 2.5 L solution contains 0.5 M glu\cose. What is the concentration of glu\cose in a 1.0 L solution made by diluting the original solution?
A. 0.1 M
Correct B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: B

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Question 18
A 50 kg person is s\tanding on a scale in a elevator. If the elevator accelerates upward at 2 m/s^2, what is the reading on the scale?
A. 550 N
B. 600 N
Correct C. 650 N
D. 700 N

Correct Answer: C

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Question 19
A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the pH of the resulting solution?
A. 7
Correct B. 8
C. 9
D. 10

Correct Answer: B

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Question 20
A 1000 L \tank contains 500 L of water and 500 L of air. If 200 L of water is added, what is the new concentration of water in the \tank?
A. 0.6
Correct B. 0.7
C. 0.8
D. 0.9

Correct Answer: B

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Question 21
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype 'rr'?
Correct A. 0.04
B. 0.16
C. 0.24
D. 0.36

Correct Answer: A

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Question 22
A neuron is stimulated by an action potential that travels along its axon. Which of the following types of receptors is most likely to be involved in this process?
Correct A. Nicotinic receptors
B. Muscarinic receptors
C. GABA receptors
D. Glutamate receptors

Correct Answer: A

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Question 23
The xylem sap of a plant contains 0.5 M sucrose, 0.2 M glu\cose, and 0.1 M fructose. What is the total osmotic pressure of the xylem sap?
A. 1.8 atm
B. 2.1 atm
Correct C. 2.5 atm
D. 3.0 atm

Correct Answer: C

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Question 24
A cell is in the G2 phase of the cell cycle. Which of the following statements is true about the cell?
Correct A. The cell is preparing for mitosis.
B. The cell is in the S phase.
C. The cell is in the G1 phase.
D. The cell is in the G2 phase.

Correct Answer: A

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Question 25
A plant has a root system with a total surface area of 100 cm^2. If the root system is exposed to a solution with a concentration of 0.5 M sucrose, what is the rate of sucrose uptake?
A. 0.05 mmol/s
Correct B. 0.1 mmol/s
C. 0.2 mmol/s
D. 0.5 mmol/s

Correct Answer: B

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