POST UTME BELLS UNIVERSITY 2025 Biology | Objective

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Question 1
A species of plant has a life cycle that consists of two generations: a diploid generation (2n) and a haploid generation (n). The diploid generation produces haploid spores through meiosis, which then grow into the haploid generation. Which of the following is a characteristic of the haploid generation?
A. It is diploid
B. It is haploid
C. It produces gametes
D. It is sterile
Question 2
A researcher is studying the effect of temperature on the growth of a microorganism. Which of the following temperatures would be most likely to result in the highest growth rate?
A. 20°C
B. 30°C
C. 40°C
D. 50°C
Question 3
A 50-g sample of a mixture containing only sodium chloride and potassium nitrate is dissolved in 100 g of water. The resulting solution has a boiling point elevation of 0.5°C. What is the molar mass of the mixture?
A. 100 g/mol
B. 150 g/mol
C. 200 g/mol
D. 250 g/mol
Question 4
The diagram below shows a simplified representation of the human eye. What is the primary function of the structure labeled 'A'?
A. To focus light onto the retina
B. To re\fract light entering the eye
C. To produce tears that lubricate the eye
D. To regulate the amount of light entering the eye
Question 5
In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' for black body color is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'B'?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 6
In a population of 1000 individuals, 70% are heterozygous for the ABO blood group gene. If 20 individuals are randomly selected, what is the expected number of individuals who are homozygous recessive for the ABO blood group gene?
A. 0
B. 2
C. 5
D. 10
Question 7
The process of mitosis results in the production of two daughter cells that are genetically identical to the parent cell. Which of the following stages of mitosis is responsible for the condensation of chromosomes?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 8
The process of mitosis results in the production of two daughter cells that are genetically identical to the parent cell. Which of the following stages of mitosis is responsible for the separation of chromosomes?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 9
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth of E. coli at different pH levels and plots the data on a graph. Which of the following graphs best represents the relationship between pH and growth of E. coli?
A. \( y = \frac{1}{1+e^{-x}} \)
B. \( y = e^x \)
C. \( y = \sin\( x \ \))
D. \( y = \cos\( x \ \))
Question 10
The process of natural selection leads to the evolution of a population by favoring individuals with traits that enhance their ability to survive and reproduce in a given environment. Which of the following is a key consequence of this process?
A. Increased genetic variation within the population
B. Reduced genetic variation within the population
C. No change in genetic variation within the population
D. Increased genetic variation between populations
Question 11
A diagram of the human skeletal system is shown below. Which bone is labeled 'A'?
A. Femur
B. Humerus
C. Patella
D. Tibia
Question 12
The process of mitosis results in the production of two daughter cells that are genetically identical to the parent cell. Which of the following stages of mitosis is responsible for the alignment of chromosomes at the metaphase plate?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 13
In the context of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP from ADP and Pi
B. To produce NADH and FADH2
C. To oxidize glu\cose
D. To reduce oxygen
Question 14
The nervous system is responsible for transmitting signals throughout the body. Which of the following types of neurons is responsible for transmitting signals from sensory receptors to the central nervous system?
A. Motor neuron
B. Sensory neuron
C. Interneuron
D. Glia cell
Question 15
A plant has a genotype of 'Rr' for the flower color gene. What is the probability that a seed produced by this plant will have the genotype 'RR'?
A. 0.25
B. 0.5
C. 0.75
D. 1

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