POST UTME OAU 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2-year-old boy is unable to hear his mother's voice when she speaks in a normal tone. However, he can hear her voice when she speaks loudly. What is the most likely cause of this condition?
A. Otosclerosis
B. Meniere's disease
C. Conductive hearing loss
D. Sensorineural hearing loss
Question 2
A researcher is studying the effect of pH on the growth of a microorganism. The researcher notices that the microorganism grows best at a pH of 7. If the pH of the medium is increased to 9, what will happen to the growth of the microorganism?
A. The growth will increase
B. The growth will decrease
C. The growth will remain the same
D. The growth will stop
Question 3
The hormone insulin is produced by the:
A. Pancreas
B. Liver
C. Kidneys
D. Adrenal glands
Question 4
The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation in the absence of certain factors. Which of the following is NOT one of the factors that can cause a change in allele frequency?
A. Mutation
B. Gene flow
C. Genetic drift
D. Natural selection
Question 5
A 50 kg person is running at a speed of 5 m/s. If the person is subjected to a force of 100 N, what is the acceleration of the person?
A. 0.5 m/s^2
B. 1.0 m/s^2
C. 2.0 m/s^2
D. 5.0 m/s^2
Question 6
A plant with a height of 10 cm has a root system that ext\ends 5 cm below the soil surface. If the plant is subjected to a drought, how far will the root system ext\end below the soil surface?
A. 2 cm
B. 5 cm
C. 10 cm
D. 15 cm
Question 7
The process of asexual reproduction in which a \single organism produces offspring that are genetically identical to itself is known as:
A. Mitosis
B. Meiosis
C. Budding
D. Binary Fission
Question 8
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 150 will be resis\tant to antibiotic A?
A. 0.95
B. 0.80
C. 0.60
D. 0.40
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. 0.72
D. 0.84
Question 10
A 30-year-old woman presents with symptoms of hyperthyroidism. Which of the following is the most likely underlying cause?
A. Graves' disease
B. Toxic multinodular goiter
C. Subacute thyroiditis
D. Thyroiditis
Question 11
A 0.5-mole sample of carbon dioxide gas is collected over water at 25°C and 1 atm. If the partial pressure of water vapor is 23.8 torr, what is the mole \fraction of carbon dioxide?
A. 0.97
B. 0.98
C. 0.99
D. 0.995
Question 12
In the context of osmoregulation, what is the primary mechanism by which the kidneys regulate the concentration of ions in the blood?
A. Active transport of ions across the renal tubules
B. Passive diffusion of ions across the renal tubules
C. Excretion of excess ions in the urine
D. Reabsorption of ions from the filtrate
Question 13
A plant with the genotype AABB has a cross with a plant with the genotype aabb. What is the probability that the offspring will have the genotype Aa?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 14
The process of genetic drift in a population can lead to the loss of genetic variation over time. Which of the following is a consequence of genetic drift?
A. Increased genetic variation
B. Decreased genetic variation
C. No change in genetic variation
D. Increased mutation rate
Question 15
A population of 1000 bacteria is growing at a rate of 20% per hour. If the population is 500 after 2 hours, what is the growth rate per hour?
A. 10%
B. 15%
C. 20%
D. 25%

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