POST UTME LAUTECH 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A population of E. coli is being studied for its genetic variation. Which of the following types of genetic variation would be most likely to result in a change in the population's phenotype?
A. Genetic drift
B. Mutation
C. Gene flow
D. Natural selection
Question 2
A researcher isolates a bacterium that exhibits the phenomenon of chemotaxis. Which of the following is a characteristic of chemotaxis?
A. The movement of bacteria towards a nutrient source
B. The movement of bacteria away from a toxic subs\tance
C. The movement of bacteria in response to temperature changes
D. The movement of bacteria in response to pH changes
Question 3
The sense organ responsible for detecting changes in sound pressure is the
A. Eye
B. Ear
C. Nose
D. Tongue
Question 4
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 produce NADH and FADH2 from the citric acid cycle
C. To pump protons across the mitochondrial inner membrane, creating a proton gradient
D. To reduce oxygen to water
Question 5
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. 0.2
D. 0.8
Question 6
A population of rabbits is growing exponentially in a controlled environment. If the initial population is 100 rabbits and the growth rate is 20% per year, what will be the population size after 5 years?
A. 1000
B. 2000
C. 4000
D. 8000
Question 7
In a tropical rainforest, the primary consumers are primarily herbivores that feed on the abundant vegetation. However, some species of insects and small mammals are known to be carnivorous. Which of the following best describes the trophic level of these carnivorous species?
A. Primary consumers
B. Secondary consumers
C. Tertiary consumers
D. Decomposers
Question 8
A diagram of a plant's xylem and phloem is shown below. Which of the following is a function of the xylem?
A. Transporting water and minerals from the roots to the leaves
B. Transporting sugars and other organic compounds from the leaves to the rest of the plant
C. Storing water and nutrients in the plant's cells
D. Regulating the plant's temperature
Question 9
A researcher studying the eco\logy of a freshwater lake observes that the water level fluctuates seasonally. What is the most likely explanation for this phenomenon?
A. Changes in precipitation patterns
B. Evaporation from the lake surface
C. Inflow from surrounding rivers
D. Outflow through the lake's outlet
Question 10
A microorganism that is capable of cau\sing disease in humans is called a pathogen. Which of the following types of microorganisms is a common cause of respiratory infections?
A. Bacteria
B. Viruses
C. Fungi
D. Protozoa
Question 11
The process of natural selection acts on
A. Genetic variation within a population
B. Genetic drift within a population
C. Gene flow between populations
D. Mutation within a population
Question 12
A diagram of the human respiratory system is shown below. Which of the following structures is responsible for the exchange of oxygen and carbon dioxide?
A. A
B. B
C. C
D. D
Question 13
In the context of evolutionary theories, what is the primary mechanism driving the adaptation of populations to changing environments?
A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation
Question 14
A plant cell has a large central vacuole that contains a high concentration of solutes. Which of the following statements is true about the movement of water into the cell?
A. Water will move out of the cell through osmosis
B. Water will move into the cell through osmosis
C. Water will move into the cell through diffusion
D. Water will move out of the cell through diffusion
Question 15
A diagram of a plant cell is shown below. Which of the following structures is responsible for photosynthesis?
A. A
B. B
C. C
D. D

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