POST UTME LAUTECH 2025 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 2025 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
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. 0.64
B. 0.36
C. 0.16
D. 0.04

Correct Answer: A

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Question 2
A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.25 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, what is the maximum speed of the block?
A. 0.5 m/s
B. 1.0 m/s
C. 1.5 m/s
Correct D. 2.0 m/s

Correct Answer: D

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Question 3
A plant cell has a vacuole that contains 0.5 M sucrose. If the cell membrane is permeable to sucrose, what is the concentration of sucrose in the cytosol after 10 minutes?
A. 0.2 M
Correct B. 0.3 M
C. 0.4 M
D. 0.5 M

Correct Answer: B

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Question 4
A 5.0 μm diameter bacterium is placed in a 1.0 μm diameter capillary tube. Assuming the bacterium is spherical, what is the ratio of the volume of the bacterium to the volume of the capillary tube?
A. 1:100
Correct B. 1:1000
C. 1:10000
D. 1:100000

Correct Answer: B

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Question 5
A 10.0 g sample of a subs\tance is dissolved in 100.0 mL of water. If the concentration of the subs\tance is 0.5 M, what is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
Correct D. 0.4 M

Correct Answer: D

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Question 6
In the context of evolutionary theories, what is the primary mechanism driving the adaptation of species to their environments?
Correct A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation

Correct Answer: A

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Question 7
Describe the process of mitosis in a eukaryotic cell, highlighting the key stages and their functions.
Correct A. Interphase, Prophase, Metaphase, Anaphase, Telophase
B. Prophase, Metaphase, Anaphase, Telophase, Cytokinesis
C. Interphase, Prophase, Metaphase, Anaphase, Cytokinesis
D. Prophase, Metaphase, Anaphase, Telophase, Interphase

Correct Answer: A

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Question 8
A plant has a xylem sap concentration of 2.5 M. If the plant's transpiration rate is 0.5 L/min, what is the rate of water uptake by the roots?
Correct A. 0.125 L/min
B. 0.25 L/min
C. 0.5 L/min
D. 1 L/min

Correct Answer: A

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Question 9
A patient is diagnosed with a bacterial infection caused by Escherichia coli. Which of the following antibiotics is most likely to be effective against this infection?
A. Penicillin
B. Amoxicillin
Correct C. Ciprofloxacin
D. Vancomycin

Correct Answer: C

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Question 10
A 35-year-old woman has been experiencing symptoms of malnutrition, including fatigue and weakness. Her diet consists mainly of refined carbohydrates and processed foods. What is the primary nutritional deficiency that she is likely to experience?
A. Vitamin B12 deficiency
Correct B. Iron deficiency
C. Folate deficiency
D. Vitamin D deficiency

Correct Answer: B

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Question 11
In a tropical rainforest, the leaf litter layer is composed of decaying plant material that supports a diverse array of microorganisms. Which of the following microorganisms is most likely to be involved in the decomposition of cellulose in this e\cosystem?
A. Bacteria
Correct B. Fungi
C. Protozoa
D. Algae

Correct Answer: B

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Question 12
A population of rabbits is growing \logistically in a closed e\cosystem. The initial population size is 100 rabbits, and the carrying capacity is 1000 rabbits. If the growth rate is 0.2 per year, what is the population size after 5 years?
A. 200
B. 500
Correct C. 800
D. 1000

Correct Answer: C

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Question 13
A patient is diagnosed with a bacterial infection caused by Staphylococcus aureus. The patient is prescribed a course of antibiotics that consists of a combination of penicillin and gentamicin. Which of the following is the most likely mechanism of action of gentamicin in this scenario?
Correct A. Inhibition of protein synthesis
B. Inhibition of cell wall synthesis
C. Inhibition of DNA replication
D. Inhibition of RNA synthesis

Correct Answer: A

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Question 14
A plant is placed in a controlled environment with a cons\tant temperature of 25°C and a photoperiod of 12 hours light and 12 hours darkness. The plant is grown in a medium with a pH of 6.5 and a nutrient solution that provides all essential nutrients. After 30 days, the plant has reached a height of 10 cm. What is the most likely reason for the limited growth of this plant?
A. Lack of light
B. Lack of water
Correct C. Lack of nutrients
D. Lack of CO2

Correct Answer: C

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Question 15
A species of bird has a beak shape that is adapted for cracking open nuts. The beak shape is determined by a \single gene with two alleles: B (beak shape) and b (normal beak shape). The frequency of the B allele in the population is 0.2. What is the expected frequency of the B allele in the next generation?
A. 0.16
Correct B. 0.24
C. 0.32
D. 0.40

Correct Answer: B

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Question 16
In a population of 1000 individuals, 70% have the dominant allele for brown eye color (B) and 30% have the recessive allele (b). If two individuals with brown eye color are randomly selected for marriage, what is the probability that their offspring will have blue eyes?
Correct A. 0.25
B. 0.30
C. 0.35
D. 0.40

Correct Answer: A

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Question 17
A 25-year-old woman has been diagnosed with a rare genetic disorder that affects her ability to digest lactose. Which of the following enzymes is most likely deficient in her body?
Correct A. Lactase
B. Amylase
C. Tryp\sin
D. Pep\sin

Correct Answer: A

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Question 18
A researcher is studying the effects of antibiotics on bacterial growth. She observes that the bacteria grow in a \logarithmic pattern, with a doubling time of 30 minutes. If the initial population is 1000 cells, how many cells will be present after 2 hours?
A. 16000
B. 32000
C. 64000
Correct D. 128000

Correct Answer: D

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Question 19
A 35-year-old man has been experiencing symptoms of irritable bowel syndrome (IBS). His doctor recomm\ends a diet rich in fiber and probiotics. Which of the following foods is a good source of probiotics?
Correct A. Yogurt
B. Cheese
C. Bread
D. Meat

Correct Answer: A

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Question 20
A researcher is studying the effects of climate change on plant growth. She observes that the plants grow in a pattern that can be described by the equation \( y = 2x^2 + 3x - 4 \). If the initial population is 100 cells, how many cells will be present after 2 hours?
A. 16000
B. 32000
C. 64000
Correct D. 128000

Correct Answer: D

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Question 21
In the context of classification of living things, what is the primary function of the kingdom level?
A. To group organisms based on their cell structure
Correct B. To group organisms based on their genetic makeup
C. To group organisms based on their body structure
D. To group organisms based on their habitat

Correct Answer: B

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Question 22
A patient is diagnosed with a bacterial infection. Which of the following is a characteristic of the bacterial cell wall?
Correct A. It is composed of peptidoglycan
B. It is composed of chitin
C. It is composed of cellulose
D. It is composed of keratin

Correct Answer: A

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Question 23
A couple is trying to conceive a child. What is the primary function of the hypothalamus in the reproductive process?
A. To regulate body temperature
B. To regulate hunger and thirst
Correct C. To stimulate the release of gonadotropin-relea\sing hormone
D. To stimulate the release of growth hormone

Correct Answer: C

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Question 24
A patient is diagnosed with a viral infection. Which of the following is a characteristic of the viral genome?
A. It is composed of DNA
Correct B. It is composed of RNA
C. It is composed of both DNA and RNA
D. It is composed of proteins

Correct Answer: B

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Question 25
A patient is experiencing kidney failure. Which of the following is a characteristic of the renal corpuscle?
A. It is composed of nephrons
Correct B. It is composed of glomeruli
C. It is composed of renal tubules
D. It is composed of blood vessels

Correct Answer: B

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