POST UTME ACHIEVERS UNIVERSITY 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A researcher is studying the effect of a new antibiotic on a bacterial culture. The culture is initially composed of 1000 bacteria, and the antibiotic reduces the population by 20% every hour. If the researcher wants to know the population after 3 hours, what is the expected number of bacteria?
A. 512
B. 640
C. 768
D. 896
Question 2
The process of respiration in animals involves the breakdown of which of the following?
A. Glu\cose
B. Proteins
C. Fats
D. Carbohydrates
Question 3
A 5% solution of glu\cose in water is isotonic with a 2% solution of urea in water. What is the molarity of the glu\cose solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 4
The hormone that regulates the level of glu\cose in the blood is?
A. Insulin
B. Glucagon
C. Adrenaline
D. Thyroxine
Question 5
In the context of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
B. To pump protons across the mitochondrial inner membrane
C. To produce NADH and FADH2
D. To reduce oxygen to water
Question 6
A cell is undergoing mitosis. If the cell has 32 chromosomes, how many chromosomes will each daughter cell have after mitosis?
A. 32
B. 64
C. 128
D. 256
Question 7
A certain species of plant has a growth rate of 20% per day. If the initial population is 100 plants, what is the population after 5 days?
A. 100
B. 120
C. 144
D. 160
Question 8
In a tropical rainforest, the presence of a large number of epiphytes such as orchids and ferns is an example of which eco\logical process?
A. Niche partitioning
B. Eco\logical succession
C. Symbiotic relationships
D. Competition for resources
Question 9
In a tropical rainforest, the primary consumers are primarily composed of which of the following?
A. Herbivorous insects
B. Fruit-eating bats
C. Large carnivorous mammals
D. Decomposers
Question 10
A diagram of a plant cell is shown below.
A. The cell membrane is the outermost layer of the cell.
B. The nucleus is the organelle that contains the cell's genetic material.
C. The mitochondria are the organelles responsible for generating energy for the cell.
D. The cell wall is the rigid layer that provides support and structure to the cell.
Question 11
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 12
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. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 13
A researcher is studying the genetic basis of a particular trait in a population. Which of the following is an example of a genetic variation?
A. A change in the frequency of a particular allele
B. A change in the expression of a particular gene
C. A change in the DNA sequence of a particular gene
D. A change in the environment that affects gene expression
Question 14
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 15
A certain species of bacteria has a generation time of 2 hours. If the initial population is 10^6 cells, what is the population after 5 generations?
A. 10^4
B. 10^5
C. 10^6
D. 10^7

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