POST UTME UNIOSUN 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is a by-product of this process?
A. Oxygen
B. Carbon dioxide
C. Water
D. Nitrogen
Question 2
A patient has been diagnosed with a bacterial infection caused by Staphylococcus aureus. Which of the following antibiotics would be most effective in treating this infection?
A. Penicillin
B. Erythromycin
C. Ciprofloxacin
D. Vancomycin
Question 3
In the process of mitosis, what is the stage where the chromosomes condense and become visible under a microscope?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 4
A diagram of a simple circuit is shown below. What is the value of the current flowing through the circuit?
A. 2A
B. 4A
C. 6A
D. 8A
Question 5
A population of bacteria is growing exponentially. If the initial population is 100 cells and the population doubles every 2 hours, what is the population after 6 hours?
A. 1000 cells
B. 2000 cells
C. 4000 cells
D. 8000 cells
Question 6
A diagram of a simple e\cosystem is shown below. What is the role of the organism labeled 'Y'?
A. Primary producer
B. Primary consumer
C. Decomposer
D. Secondary consumer
Question 7
The Hardy-Weinberg principle states that the frequency of alleles in a population remains cons\tant from generation to generation in the absence of certain factors. Which of the following is a factor that can lead to a change in allele frequency?
A. Mutation
B. Gene flow
C. Genetic drift
D. Natural selection
Question 8
A 5.0 L flask contains 2.0 mol of an ideal gas at a temperature of 300 K. What is the pressure of the gas?
A. 10.2 kPa
B. 20.4 kPa
C. 30.6 kPa
D. 40.8 kPa
Question 9
A cell in interphase is preparing for DNA replication. What is the stage of the cell cycle at which this occurs?
A. G1
B. G2
C. S
D. M
Question 10
In the xylem, what is the primary function of the tracheids?
A. Transport of water and minerals from roots to leaves
B. Transport of sugars and amino acids from leaves to roots
C. Storage of water and nutrients in the stem
D. Regulation of water potential in the plant
Question 11
In a population of 1000 individuals, 200 are heterozygous for a particular gene. If the gene is inherited in an autosomal dominant manner, what is the frequency of the dominant allele?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 12
What is the primary function of the mitochondria in a cell?
A. Protein synthesis
B. Cell signaling
C. Energy production
D. Cell division
Question 13
A 30-year-old woman is diagnosed with a rare disease characterized by an inability to synthesize a particular hormone. Which of the following is the most likely cause of this disease?
A. Mutation in the gene encoding the enzyme responsible for the hormone synthesis
B. Deletion of the gene encoding the enzyme responsible for the hormone synthesis
C. Inheri\tance of a recessive allele that codes for a non-functional enzyme
D. Infection with a virus that disrupts the gene encoding the enzyme
Question 14
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. 0.6
B. 0.4
C. 0.8
D. 0.2
Question 15
A plant is placed in a greenhouse with a temperature of 25°C and a relative humidity of 60%. The plant's stomata are open, and it is undergoing photosynthesis. What is the rate of transpiration in this plant?
A. 0.5 g/min
B. 1.0 g/min
C. 1.5 g/min
D. 2.0 g/min

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