POST UTME BSU 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A certain species of plant has a 50% chance of producing a flower. If 1000 plants are grown, how many are expected to produce flowers?
A. 250
B. 500
C. 750
D. 1000
Question 2
A person is experiencing a loss of vision due to a detached retina. What is the primary function of the vitreous humor in this situation?
A. To maintain the shape of the eye
B. To regulate the amount of light entering the eye
C. To provide nutrients to the retina
D. To maintain the pressure in the eye
Question 3
A plant cell is placed in a solution with a high concentration of sucrose. 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 burst due to osmotic pressure
Question 4
A person is experiencing respiratory distress due to a severe asthma attack. Which of the following is a likely consequence of the increased airway resis\tance?
A. Increased oxygen levels in the blood
B. Decreased lung volume
C. Increased airway pressure
D. Decreased respiratory rate
Question 5
In a closed system, what is the net effect of the reaction 2CO2 + 2H2O → C6H12O6 + 6O2 on the concentration of oxygen?
A. The concentration of oxygen increases.
B. The concentration of oxygen decreases.
C. The concentration of oxygen remains the same.
D. The concentration of oxygen is not affected.
Question 6
A 2.5 L flask contains 0.5 M HCl. If 1.0 M NaOH is added to the flask, what is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 7
What is the primary function of the Golgi apparatus in a plant cell?
A. Protein synthesis
B. Cell signaling
C. Lipid synthesis
D. Protein modification and transport
Question 8
The process of natural selection acts on the variation in a population, leading to the adaptation of the population to its environment. What is the driving force behind this adaptation?
A. mutation
B. genetic drift
C. gene flow
D. environmental pressure
Question 9
A couple is trying to conceive a child. Which of the following is a likely cause of infertility in the male partner?
A. Low sperm count
B. Poor sperm motility
C. Abnormal sperm morpho\logy
D. All of the above
Question 10
The nervous system is responsible for transmitting signals throughout the body. What is the primary function of the synapse in the nervous system?
A. transmitting signals from one neuron to another
B. regulating the strength of the signal
C. supporting the structure of the neuron
D. controlling the release of neurotransmitters
Question 11
A population of Drosophila melanogaster has a frequency of the dominant allele 'A' of 0.8. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype 'aa'?
A. 0.16
B. 0.36
C. 0.64
D. 0.84
Question 12
In a closed e\cosystem, the rate of respiration in a population of organisms is directly proportional to the concentration of oxygen in the atmosphere. If the concentration of oxygen decreases by 20% and the rate of respiration decreases by 15%, what is the ratio of the initial rate of respiration to the final rate of respiration?
A. 1.25
B. 1.5
C. 1.75
D. 2.0
Question 13
A 2.5 L flask contains 0.5 M HCl. If 1.5 L of this solution is removed and replaced with 1.5 L of 0.5 M NaOH, what is the concentration of the resulting solution?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 14
A cell is undergoing mitosis. Which of the following stages is characterized by the separation of sister chromatids?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 15
A population of Drosophila melanogaster is being studied for its evolutionary adaptation to a changing environment. Which of the following is a likely outcome of natural selection in this population?
A. The population will become more genetically diverse
B. The population will adapt to the changing environment
C. The population will become less fit
D. The population will go extinct

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