POST UTME ESUT 2024 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of the human eye is shown below. What is the function of the part labeled A?
A. To focus light on the retina
B. To detect movement
C. To regulate pupil size
D. To produce tears
Question 2
In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype 'bb'?
A. 0.04
B. 0.16
C. 0.24
D. 0.36
Question 3
A researcher is studying the effect of pH on the growth of E. coli bacteria. She measures the growth of the bacteria in a controlled environment with varying pH levels. The data is as follows: pH Growth (OD600) 4 0.2 5 0.5 6 1.0 7 2.0 8 4.0 What is the pKa of the buffer system?
A. 4.5
B. 5.5
C. 6.5
D. 7.5
Question 4
The process by which an organism's genetic information is passed from one generation to the next is
A. Mutation
B. Genetic drift
C. Natural selection
D. Heritability
Question 5
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 6
In the context of eco\logy, what is the primary function of a keystone species in a given e\cosystem?
A. To occupy a unique eco\logical niche
B. To regulate the population of other species
C. To maintain the structure of the e\cosystem
D. To facilitate the flow of energy through the e\cosystem
Question 7
A diagram of a photosynthesis equation is shown below. What is the role of the enzyme RuBisCO in this process?
A. Fixes CO2 into a 3-carbon molecule
B. Reduces CO2 into a 3-carbon molecule
C. Fixes CO2 into a 4-carbon molecule
D. Reduces CO2 into a 4-carbon molecule
Question 8
A cell is placed in a solution with a pH of 5.5. What is the concentration of hydrogen ions in the solution?
A. 10^{-5}
B. 10^{-5.5}
C. 10^{-6}
D. 10^{-7}
Question 9
In a typical plant cell, what is the primary function of the mitochondria?
A. Protein synthesis
B. Cell signaling
C. Energy production
D. Cell division
Question 10
In a tropical rainforest, the presence of a large number of epiphytes such as orchids and ferns on tree trunks is an example of which type of symbiotic relationship?
A. Mutualism
B. Commensalism
C. Parasitism
D. Neutralism
Question 11
A plant hormone that promotes cell elongation and cell division is
A. Auxin
B. Gibberellin
C. Cytokinin
D. Ethylene
Question 12
A plant is crossed with a plant that has a mutation in the 'R' gene. What is the probability that the offspring will have the 'Rr' genotype?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 13
A researcher isolates a bacterium that exhibits both lactose fermentation and gelatin hydrolysis. Which of the following is a possible genus for this bacterium?
A. Escherichia
B. Salmonella
C. Klebsiella
D. Proteus
Question 14
A researcher is studying the genetic variation of a population of rabbits. Which of the following genetic concepts would best explain the observed variation in fur color?
A. Genetic drift
B. Gene flow
C. Mutation
D. Natural selection
Question 15
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 homozygous dominant genotype?
A. 0.2
B. 0.4
C. 0.6
D. 0.8

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