POST UTME LAUTECH 2023 Biology | Objective

Are you preparing for POST UTME LAUTECH exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
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
Correct B. Secondary consumers
C. Tertiary consumers
D. Decomposers

Correct Answer: B

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Question 2
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
Correct 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

Correct Answer: B

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Question 3
A species of bird has a unique mating ritual where the male bird builds a complex nest and performs a specific dance to attract a female. Which of the following best describes the reproductive strategy of this species?
Correct A. Monogamy
B. Polygyny
C. Polyandry
D. Asexual reproduction

Correct Answer: A

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Question 4
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
Correct D. 8000

Correct Answer: D

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Question 5
A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?
A. To synthesize proteins
Correct B. To store genetic information
C. To regulate cell growth
D. To transport materials

Correct Answer: B

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Question 6
In the context of osmoregulation, what is the primary function of the kidneys in maintaining electrolyte balance?
A. To regulate pH levels in the blood
Correct B. To maintain the balance of electrolytes in the body
C. To regulate the concentration of glu\cose in the blood
D. To remove waste products from the body

Correct Answer: B

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Question 7
A population of Drosophila melanogaster 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
Correct B. Mutation
C. Gene flow
D. Natural selection

Correct Answer: B

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Question 8
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?
Correct A. A
B. B
C. C
D. D

Correct Answer: A

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Question 9
A diagram of a plant cell is shown below. Which of the following structures is responsible for photosynthesis?
Correct A. A
B. B
C. C
D. D

Correct Answer: A

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Question 10
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
Correct B. Mutation
C. Gene flow
D. Natural selection

Correct Answer: B

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Question 11
In a typical xylem vessel, what is the primary function of the lignin?
Correct A. To provide structural support to the vessel
B. To facilitate the transport of water and minerals
C. To regulate the rate of transpiration
D. To prevent the collapse of the vessel

Correct Answer: A

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Question 12
A patient is diagnosed with a fungal infection caused by Aspergillus fumigatus. Which of the following is a characteristic feature of this fungus?
Correct A. It produces conidia in a slime droplet
B. It produces asexual spores in a chain
C. It produces a \single, large conidium
D. It produces a large, multicellular conidiophore

Correct Answer: A

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Question 13
In a tropical rainforest e\cosystem, what is the primary role of the decomposer community?
A. To produce organic compounds from inorganic subs\tances
Correct B. To break down complex organic molecules into simpler compounds
C. To synthesize new organic compounds from inorganic subs\tances
D. To absorb and store energy from the sun

Correct Answer: B

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Question 14
A cell is in the G2 phase of the cell cycle. What is the primary function of the cyclin-dep\endent kinase (CDK) in this phase?
A. To regulate the progression from G1 to S phase
Correct B. To regulate the progression from G2 to M phase
C. To regulate the progression from S to G2 phase
D. To regulate the progression from M to G1 phase

Correct Answer: B

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Question 15
A species of plant is undergoing asexual reproduction through the production of adventitious roots. What is the primary advantage of this method of reproduction?
Correct A. It allows for the production of genetically identical offspring
B. It allows for the production of offspring with increased genetic diversity
C. It allows for the production of offspring with increased vigor
D. It allows for the production of offspring with increased resis\tance to disease

Correct Answer: A

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Question 16
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'?
Correct A. 0.6
B. 0.4
C. 0.2
D. 0.8

Correct Answer: A

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Question 17
A researcher isolates a bacterium that exhibits the phenomenon of chemotaxis. Which of the following is a characteristic of chemotaxis?
Correct 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

Correct Answer: A

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Question 18
A diagram of a plant's xylem and phloem is shown below. Which of the following is a function of the xylem?
Correct 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

Correct Answer: A

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Question 19
A geneticist is studying the inheri\tance of a trait in a population of mice. The trait is controlled by a \single gene with two alleles: 'B' and 'b'. The geneticist finds that the frequency of the 'B' allele is 0.7. What is the frequency of the homozygous recessive genotype 'bb'?
Correct A. 0.3
B. 0.4
C. 0.5
D. 0.6

Correct Answer: A

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Question 20
A diagram of a human blood vessel is shown below. Which of the following is a function of the blood vessel?
Correct A. Transporting oxygen from the lungs to the rest of the body
B. Transporting carbon dioxide from the rest of the body to the lungs
C. Regulating the body's temperature
D. Storing blood cells

Correct Answer: A

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Question 21
In the context of evolutionary theories, what is the primary mechanism driving the adaptation of populations to changing environments?
Correct A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation

Correct Answer: A

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Question 22
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
Correct B. Evaporation from the lake surface
C. Inflow from surrounding rivers
D. Outflow through the lake's outlet

Correct Answer: B

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Question 23
A patient with kidney disease is experiencing symptoms of fluid overload. What is the primary function of the kidneys that is impaired in this condition?
A. Excretion of waste products
B. Regulation of electrolyte balance
C. Maintenance of acid-base balance
Correct D. Osmoregulation

Correct Answer: D

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Question 24
A bio\logist studying the structure of a plant cell observes that the cell wall is composed of a rigid layer of cellulose. What is the primary function of this layer?
Correct A. Support and maintain cell shape
B. Regulate water uptake and transport
C. Facilitate cell division
D. Protect the cell from pathogens

Correct Answer: A

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Question 25
A nutritionist is studying the process of photosynthesis in a plant. What is the primary reac\tant that is converted into glu\cose during this process?
Correct A. Carbon dioxide
B. Water
C. Glu\cose
D. Oxygen

Correct Answer: A

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