POST UTME OAU 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the context of classification of living things, what is the primary characteristic used to distinguish between prokaryotic and eukaryotic cells?
A. Presence of a nucleus
B. Presence of mitochondria
C. Presence of a cell wall
D. Presence of chloroplasts
Question 2
In the context of evolutionary theories, what is the primary mechanism by which natural selection acts on populations?
A. Genetic drift
B. Gene flow
C. Mutation
D. Natural selection
Question 3
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'R'?
A. 0.8
B. 0.6
C. 0.4
D. 0.2
Question 4
The Hardy-Weinberg principle states that genetic variation in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a condition necessary for the Hardy-Weinberg principle to hold?
A. Random mating
B. No mutation
C. No gene flow
D. All of the above
Question 5
A diagram shows a neuron with a long axon and a large d\endrite. What is the most likely function of this neuron?
A. Sensory input
B. Motor output
C. Synaptic transmission
D. Neurotransmitter release
Question 6
A researcher is studying the effects of exercise on muscle growth and regulation. Which of the following statements is true regarding the role of myostatin in muscle hypertrophy?
A. Myostatin inhibits muscle growth by suppres\sing the expression of muscle-specific genes
B. Myostatin promotes muscle growth by increa\sing the production of muscle proteins
C. Myostatin has no effect on muscle growth or regulation
D. Myostatin is a growth factor that stimulates muscle hypertrophy
Question 7
A cell is placed in a solution with a high concentration of salt. What will happen to the cell?
A. The cell will swell and eventually burst.
B. The cell will shrink and lose water.
C. The cell will remain unchanged.
D. The cell will undergo mitosis.
Question 8
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'R'?
A. 0.8
B. 0.6
C. 0.4
D. 0.2
Question 9
The concept of natural selection was first proposed by Charles Darwin in his book 'On the Origin of Species'. Which of the following is a key component of natural selection?
A. Variation in population
B. Heritability of traits
C. Differential reproduction
D. All of the above
Question 10
A plant with the genotype 'RR' is crossed with a plant with the genotype 'Rr'. What is the probability that the offspring will have the genotype 'rr'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 11
A genetic trait is said to be dominant if it will be expressed in an individual even if the individual has one copy of the recessive allele. What is the genotype of an individual who is homozygous dominant for the trait?
A. AA
B. Aa
C. aa
D. Ab
Question 12
Which of the following tissues is primarily responsible for the production of digestive enzymes in the small intestine?
A. Stratified squamous epithelium
B. Simple columnar epithelium
C. Stratified cuboidal epithelium
D. Simple cuboidal epithelium
Question 13
A diagram of a plant's xylem tissue is shown below. Identify the structure labeled 'A'.
A. Xylem vessel
B. Tracheid
C. Phloem
D. Parenchyma
Question 14
The xylem is a type of vascular tissue found in plants that is responsible for transporting water and minerals from the roots to the leaves. What is the primary function of the xylem in the context of plant transport systems?
A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the roots
C. To provide structural support to the plant
D. To synthesize proteins
Question 15
A diagram of a human heart is shown below. Which of the following statements is true regarding the structure of the heart?
A. The heart has four chambers: two atria and two ventricles.
B. The heart has three chambers: two atria and one ventricle.
C. The heart has two chambers: one atrium and one ventricle.
D. The heart has no chambers.

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