POST UTME CHRISTOPHER UNIVERSITY 2025 Biology | Objective

Are you preparing for POST UTME CHRISTOPHER UNIVERSITY 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 1000 bacteria, 80% are resis\tant to antibiotic A, 70% are resis\tant to antibiotic B, and 60% are resis\tant to both. What is the probability that a randomly selected bacterium is resis\tant to at least one of the antibiotics?
A. 0.4
Correct B. 0.6
C. 0.8
D. 0.9

Correct Answer: B

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Question 2
A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.25 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, what is the maximum speed of the block?
A. 0.5 m/s
Correct B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s

Correct Answer: B

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Question 3
A diagram of the human eye is shown below. Which part of the eye is responsible for adjusting the size of the pupil?
A. Pupil
Correct B. Iris
C. Lens
D. Retina

Correct Answer: B

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Question 4
A 10 mL sample of a solution containing 0.1 M NaCl is mixed with 20 mL of a solution containing 0.2 M NaCl. What is the resulting concentration of NaCl in the mixture?
A. 0.05 M
B. 0.1 M
Correct C. 0.15 M
D. 0.2 M

Correct Answer: C

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Question 5
A diagram of the human heart is shown below. Which part of the heart pumps blood to the lungs?
A. Left Ventricle
B. Right Ventricle
Correct C. Pulmonary Valve
D. Tricuspid Valve

Correct Answer: C

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Question 6
In the context of evolutionary theory, what is the primary mechanism by which genetic drift leads to the fixation of a deleterious mutation?
A. Genetic hitchhiking
B. Genetic linkage
Correct C. Genetic drift
D. Genetic mutation

Correct Answer: C

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Question 7
A 30-year-old woman presents with a 2-year history of infertility. Her husband has a normal semen analysis. What is the most likely cause of her infertility?
Correct A. Polycystic ovary syndrome (PCOS)
B. Endometriosis
C. Tubal ligation
D. Premature ovarian failure

Correct Answer: A

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Question 8
A 40-year-old man is diagnosed with chronic obstructive pulmonary disease (COPD). What is the primary mechanism by which COPD leads to respiratory failure?
Correct A. Airway obstruction
B. Alveolar damage
C. Pulmonary hypertension
D. Cardiac failure

Correct Answer: A

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Question 9
A 25-year-old woman is diagnosed with a rare genetic disorder that affects her nervous system. What is the primary mechanism by which this disorder leads to muscle weakness?
Correct A. Muscle denervation
B. Muscle atrophy
C. Muscle fatigue
D. Muscle paralysis

Correct Answer: A

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Question 10
A 35-year-old man is diagnosed with a rare genetic disorder that affects his reproductive system. What is the primary mechanism by which this disorder leads to infertility?
Correct A. Sperm DNA fragmentation
B. Sperm motility disorder
C. Sperm morpho\logy disorder
D. Hormonal imbalance

Correct Answer: A

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Question 11
In the context of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
B. To produce NADH and FADH2 during glycolysis
Correct C. To pump protons across the mitochondrial inner membrane
D. To reduce oxygen to water

Correct Answer: C

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Question 12
A 25-year-old patient presents with symptoms of polyuria, polydipsia, and weight loss. Laboratory tests reveal hyperglycemia and gly\cosuria. Which of the following is the most likely diagnosis?
Correct A. Type 1 diabetes mellitus
B. Type 2 diabetes mellitus
C. Maturity-onset diabetes of the young (MODY)
D. Pancreatic cancer

Correct Answer: A

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Question 13
A cell is placed in a hypotonic solution. What will happen to the cell?
A. The cell will shrink due to water loss
Correct B. The cell will swell due to water uptake
C. The cell will remain unchanged
D. The cell will lyse due to osmotic shock

Correct Answer: B

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Question 14
A population of rabbits is introduced to a new island. Over time, the population grows exponentially. Which of the following is the most likely explanation for this growth?
A. The rabbits have adapted to the new environment
B. The rabbits have formed a symbiotic relationship with other species
C. The rabbits have access to unlimited resources
Correct D. The rabbits have a high reproductive rate

Correct Answer: D

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Question 15
A person is unable to hear sounds above 2000 Hz. Which of the following is the most likely explanation for this hearing loss?
Correct A. Damage to the cochlea
B. Damage to the auditory nerve
C. Presbycusis
D. Otosclerosis

Correct Answer: A

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Question 16
In the context of eco\logical succession, what is the primary mechanism driving the transition from a pioneer community to a climax community?
Correct A. Competition for resources
B. Predation and herbivory
C. Mutualism and symbiotic relationships
D. Nutrient cycling and decomposition

Correct Answer: A

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Question 17
A researcher is studying the effects of light intensity on photosynthesis in a controlled environment. Which of the following variables would be most relevant to measure?
A. Temperature
B. pH
Correct C. Light intensity
D. Water availability

Correct Answer: C

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Question 18
A population of rabbits is growing \logistically. If the carrying capacity is 1000 individuals and the growth rate is 0.2 per year, what is the population size after 5 years?
A. 500
B. 750
C. 1000
Correct D. 1250

Correct Answer: D

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Question 19
A diagram of a plant cell is shown below. What is the function of the organelle labeled 'X'?
A. Photosynthesis
B. Cell signaling
Correct C. Energy production
D. Protein synthesis

Correct Answer: C

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Question 20
A researcher is studying the effects of climate change on coral reefs. Which of the following is a potential consequence of ri\sing sea temperatures?
A. Increased coral growth
B. Decreased fish populations
Correct C. Mass coral bleaching
D. Reduced ocean acidification

Correct Answer: C

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Question 21
In a population of 1000 individuals, 60% are heterozygous for the gene controlling the flower color, with 40% being homozygous recessive. If 10% of the population is randomly selected for a study, what is the probability that at least one individual in the sample is homozygous recessive?
A. 0.36
B. 0.64
Correct C. 0.80
D. 0.90

Correct Answer: C

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Question 22
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. 0.50
C. 0.75
D. 0.90

Correct Answer: B

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Question 23
A solution of glu\cose (C6H12O6) is prepared by dissolving 20g of glu\cose in 100ml of water. What is the molarity of the solution?
A. 0.5M
Correct B. 1.0M
C. 2.0M
D. 4.0M

Correct Answer: B

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Question 24
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. 0.50
C. 0.75
D. 0.90

Correct Answer: B

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Question 25
A solution of sodium chloride (NaCl) is prepared by dissolving 10g of NaCl in 100ml of water. What is the molarity of the solution?
A. 0.5M
Correct B. 1.0M
C. 2.0M
D. 4.0M

Correct Answer: B

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