POST UTME CHRISTOPHER UNIVERSITY 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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
B. 1.0M
C. 2.0M
D. 4.0M
Question 2
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
C. 0.80
D. 0.90
Question 3
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 4
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 5
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 6
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
Question 7
A population of rabbits (Oryctolagus cuniculus) is introduced to a new island with limited resources. The population grows exponentially at first, but eventually reaches a carrying capacity. What is the term for this type of population growth?
A. Logistic growth
B. Exponential growth
C. Sigmoid growth
D. Linear growth
Question 8
In a desert e\cosystem, a cactus plant (Cereus giganteus) has a waxy coating on its stems to prevent water loss. However, this adaptation also affects its ability to undergo photosynthesis. Which of the following is a consequence of this adaptation?
A. Increased water loss through transpiration
B. Decreased photosynthetic rate due to reduced stomatal density
C. Increased photosynthetic rate due to increased CO2 concentration
D. No effect on photosynthesis
Question 9
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will have the genotype 'TT'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 10
A diagram of a plant cell is shown below. What is the function of the organelle labeled 'X'?
A. Photosynthesis
B. Cell signaling
C. Energy production
D. Protein synthesis
Question 11
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
D. 1250
Question 12
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
B. Iris
C. Lens
D. Retina
Question 13
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
C. Genetic drift
D. Genetic mutation
Question 14
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?
A. Polycystic ovary syndrome (PCOS)
B. Endometriosis
C. Tubal ligation
D. Premature ovarian failure
Question 15
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
C. Mass coral bleaching
D. Reduced ocean acidification

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