POST UTME ACHIEVERS UNIVERSITY 2022 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the context of excretion, what is the primary function of the kidneys?
A. To regulate blood pressure
B. To filter waste products from the blood
C. To produce hormones that stimulate digestion
D. To control body temperature
Question 2
A diagram of a human eye is shown below.
A. The cornea is responsible for focu\sing light
B. The iris controls the amount of light entering the eye
C. The retina contains the photoreceptors
D. The lens is responsible for changing the focal length
Question 3
A population of rabbits is growing exponentially. What is the likely effect on the population size after 10 generations?
A. The population size will decrease
B. The population size will remain cons\tant
C. The population size will increase exponentially
D. The population size will increase linearly
Question 4
In the context of hormonal regulation, what is the primary function of the hypothalamus?
A. To produce hormones that stimulate appetite
B. To regulate body temperature
C. To control the release of hormones from the pituitary gland
D. To synthesize proteins
Question 5
A xylem vessel has a diameter of 10 μm. What is the likely effect on the rate of water transport through the vessel?
A. Increased rate of water transport
B. Decreased rate of water transport
C. No effect on the rate of water transport
D. Variable rate of water transport
Question 6
A diagram of a human respiratory system is shown below. What is the function of the alveoli in this system?
A. Exchange of oxygen and carbon dioxide between the lungs and the bloodstream
B. Filtering of the blood to remove waste products
C. Production of mucus to trap dust and other particles
D. Regulation of body temperature
Question 7
In the context of blood transport systems, which of the following is a characteristic of the erythrocyte membrane?
A. High permeability to water
B. Low permeability to water
C. High permeability to ions
D. Low permeability to ions
Question 8
A diagram of a plant cell is shown below. What is the function of the vacuole?
A. To store water and nutrients
B. To synthesize proteins
C. To produce chlorophyll
D. To regulate the pH of the cell
Question 9
A diagram of a simple circuit is shown below.
A. The circuit is a series circuit
B. The circuit is a parallel circuit
C. The circuit is a combination of series and parallel circuits
D. The circuit is a closed circuit
Question 10
In the context of eco\logy, what is the primary function of a keystone species?
A. To regulate the population of other species
B. To provide a source of food for other species
C. To create a habitat for other species
D. To maintain the balance of the e\cosystem
Question 11
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. What is the expected frequency of the homozygous recessive genotype 'aa'?
A. 0.04
B. 0.08
C. 0.12
D. 0.16
Question 12
A patient is experiencing symptoms of dizziness, nausea, and vomiting after a meal. Which of the following nerves is most likely responsible for these symptoms?
A. Vagus nerve
B. Trigeminal nerve
C. Glossopharyngeal nerve
D. Vestibulocochlear nerve
Question 13
A 25-year-old patient presents with symptoms of fatigue, weakness, and shortness of breath. Laboratory tests reveal a hemoglobin level of 8 g/dL. Which of the following is the most likely diagnosis?
A. Iron deficiency anemia
B. Vitamin B12 deficiency anemia
C. Folate deficiency anemia
D. Sickle cell anemia
Question 14
In a population of E. coli bacteria, the average generation time is 30 minutes. If the initial population size is 1000 cells, what is the population size after 5 generations?
A. 5000
B. 10000
C. 20000
D. 50000
Question 15
The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?
A. Random mating
B. Large population size
C. No mutation
D. No genetic drift

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