POST UTME CHRISTOPHER UNIVERSITY 2025 Biology | Objective

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Question 1
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth rate of the bacteria at different pH levels and plots the data on a graph. If the growth rate is highest at a pH of 7.5, what can be concluded about the optimal pH for the growth of E. coli?
A. The optimal pH for the growth of E. coli is 7.5.
B. The optimal pH for the growth of E. coli is between 6.5 and 7.5.
C. The optimal pH for the growth of E. coli is above 7.5.
D. The optimal pH for the growth of E. coli is below 6.5.
Question 2
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?
A. Sperm DNA fragmentation
B. Sperm motility disorder
C. Sperm morpho\logy disorder
D. Hormonal imbalance
Question 3
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
B. 0.50
C. 0.75
D. 0.90
Question 4
A bio\logist is studying the process of photosynthesis in plants. The bio\logist measures the rate of photosynthesis at different light intensities and plots the data on a graph. If the rate of photosynthesis is highest at a light intensity of 1000 μmol/m²s, what can be concluded about the optimal light intensity for photosynthesis?
A. The optimal light intensity for photosynthesis is 1000 μmol/m²s.
B. The optimal light intensity for photosynthesis is between 500 and 1000 μmol/m²s.
C. The optimal light intensity for photosynthesis is above 1000 μmol/m²s.
D. The optimal light intensity for photosynthesis is below 500 μmol/m²s.
Question 5
A researcher is studying the effect of climate change on the distribution of species in a particular e\cosystem. The researcher plots the data on a graph and finds that the distribution of species is shifting towards the poles. What can be concluded about the effect of climate change on the distribution of species?
A. Climate change is cau\sing the distribution of species to shift towards the equator.
B. Climate change is cau\sing the distribution of species to shift towards the poles.
C. Climate change is not affecting the distribution of species.
D. Climate change is cau\sing the distribution of species to shift randomly.
Question 6
A cell is placed in a hypotonic solution. What will happen to the cell?
A. The cell will shrink due to water loss
B. The cell will swell due to water uptake
C. The cell will remain unchanged
D. The cell will lyse due to osmotic shock
Question 7
A researcher is studying the effect of pH on the activity of an enzyme. Which of the following pH values would result in the highest enzyme activity?
A. pH 4
B. pH 7
C. pH 10
D. pH 12
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?
A. Airway obstruction
B. Alveolar damage
C. Pulmonary hypertension
D. Cardiac failure
Question 9
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. 0.8
D. 0.16
Question 10
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
B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s
Question 11
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
C. Pulmonary Valve
D. Tricuspid Valve
Question 12
A nerve impulse travels at a speed of 1 m/s. If the impulse travels for 2 seconds, how far does it travel?
A. 0.5 m
B. 1 m
C. 2 m
D. 4 m
Question 13
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?
A. Muscle denervation
B. Muscle atrophy
C. Muscle fatigue
D. Muscle paralysis
Question 14
A population of birds (Passer domesticus) is migrating to a new habitat. Which of the following factors would most likely affect their migration pattern?
A. Food availability
B. Predator presence
C. Weather conditions
D. Habitat quality
Question 15
In the context of eco\logical succession, what is the primary mechanism driving the transition from a pioneer community to a climax community?
A. Competition for resources
B. Predation and herbivory
C. Mutualism and symbiotic relationships
D. Nutrient cycling and decomposition

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