POST UTME BELLS UNIVERSITY 2025 Biology | Objective

Are you preparing for POST UTME BELLS UNIVERSITY 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 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
Correct B. 2
C. 5
D. 10

Correct Answer: B

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Question 2
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?
Correct A. \( y = \frac{1}{1+e^{-x}} \)
B. \( y = e^x \)
C. \( y = \sin\( x \ \))
D. \( y = \cos\( x \ \))

Correct Answer: A

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Question 3
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
Correct B. It is haploid
C. It produces gametes
D. It is sterile

Correct Answer: B

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Question 4
A population of rabbits is growing at a rate of 20% per year. If the population is currently 1000 individuals, what will be the population size after 5 years?
A. 1000
B. 1200
C. 1600
Correct D. 2000

Correct Answer: D

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Question 5
A researcher is studying the effect of temperature on the rate of chemical reaction. The researcher measures the rate of reaction at different temperatures and plots the data on a graph. Which of the following graphs best represents the relationship between temperature and rate of reaction?
A. \( y = \frac{1}{1+e^{-x}} \)
Correct B. \( y = e^x \)
C. \( y = \sin\( x \ \))
D. \( y = \cos\( x \ \))

Correct Answer: B

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Question 6
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 expected frequency of the homozygous dominant genotype 'AA'?
A. 0.36
Correct B. 0.64
C. 0.72
D. 0.84

Correct Answer: B

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Question 7
A researcher is studying the effect of pH on the activity of the enzyme lactase. Which of the following pH values would be most likely to result in the highest activity of lactase?
A. pH 4.0
B. pH 6.0
Correct C. pH 7.0
D. pH 9.0

Correct Answer: C

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Question 8
A cell is placed in a hypotonic solution. What will happen to the cell?
A. The cell will shrink.
Correct B. The cell will swell.
C. The cell will remain the same size.
D. The cell will burst.

Correct Answer: B

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Question 9
A population of rabbits is growing according to the \logistic growth model. If the initial population size is 100, the carrying capacity is 1000, and the growth rate is 0.5, what is the population size after 5 years?
A. 500
Correct B. 714.286
C. 1000
D. 2000

Correct Answer: B

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Question 10
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
Correct C. 40°C
D. 50°C

Correct Answer: C

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Question 11
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
Correct B. Reduced genetic variation within the population
C. No change in genetic variation within the population
D. Increased genetic variation between populations

Correct Answer: B

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Question 12
In the context of cellular respiration, what is the primary function of the electron transport chain?
Correct A. To generate ATP from ADP and Pi
B. To produce NADH and FADH2
C. To oxidize glu\cose
D. To reduce oxygen

Correct Answer: A

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Question 13
The diagram below shows a cross-section of a plant root. What is the primary function of the tissue labeled 'A'?
Correct A. To transport water and minerals from the soil to the xylem
B. To produce auxins that promote cell elongation
C. To store starch and other nutrients
D. To regulate gas exchange between the root and the atmosphere

Correct Answer: A

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Question 14
The Hardy-Weinberg principle states that a population will be in genetic equilibrium if it meets certain conditions. Which of the following is NOT one of these conditions?
A. Random mating
B. No mutation
C. No gene flow
Correct D. No natural selection

Correct Answer: D

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Question 15
The diagram below shows a simplified representation of the human eye. What is the primary function of the structure labeled 'A'?
Correct 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

Correct Answer: A

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Question 16
In a typical xylem vessel, what is the primary function of the lignin-rich secondary cell wall?
Correct A. To provide structural support to the vessel
B. To facilitate water and mineral transport
C. To regulate water potential
D. To store starch and other nutrients

Correct Answer: A

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Question 17
What is the primary mechanism by which the hypothalamus regulates body temperature?
A. Through the release of hormones that stimulate sweating
B. Through the release of hormones that stimulate shivering
Correct C. Through the regulation of blood flow to the skin
D. Through the regulation of respiration rate

Correct Answer: C

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Question 18
In a typical e\cosystem, what is the primary function of decomposers?
A. To produce organic compounds from inorganic subs\tances
Correct B. To break down dead organisms and recycle nutrients
C. To produce oxygen through photosynthesis
D. To regulate water potential

Correct Answer: B

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Question 19
What is the primary mechanism by which the kidneys regulate acid-base balance?
Correct A. Through the excretion of hydrogen ions
B. Through the reabsorption of bicarbonate ions
C. Through the excretion of potassium ions
D. Through the regulation of respiration rate

Correct Answer: A

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Question 20
In a typical plant cell, what is the primary function of the vacuole?
Correct A. To store water and nutrients
B. To regulate water potential
C. To produce organic compounds from inorganic subs\tances
D. To break down dead organisms and recycle nutrients

Correct Answer: A

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Question 21
A population of Drosophila melanogaster is being studied for its genetic variation. The frequency of the recessive allele 'a' is 0.2, and the frequency of the dominant allele 'A' is 0.8. What is the expected frequency of the homozygous recessive genotype 'aa' in the next generation?
Correct A. 0.16
B. 0.24
C. 0.32
D. 0.40

Correct Answer: A

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Question 22
A researcher is studying the effect of antibiotics on the growth of E. coli bacteria. The bacteria are grown in a controlled environment, and their growth is measured over time. The data is shown below. What is the rate of growth of the bacteria?
Correct A. 0.5
B. 0.6
C. 0.7
D. 0.8

Correct Answer: A

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Question 23
A patient is suffering from a severe case of malaria. The patient's blood is being tested for the presence of the Plasmodium falciparum parasite. The test results show that the patient's blood contains 10^6 parasites per milliliter. What is the concentration of the parasite in the patient's blood?
A. 10^4
B. 10^5
Correct C. 10^6
D. 10^7

Correct Answer: C

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Question 24
A patient is suffering from a severe case of kidney failure. The patient's blood is being tested for the presence of waste products. The test results show that the patient's blood contains 10^3 milligrams per deciliter of urea. What is the concentration of the urea in the patient's blood?
A. 10^2
Correct B. 10^3
C. 10^4
D. 10^5

Correct Answer: B

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Question 25
A patient is suffering from a severe case of heart failure. The patient's blood is being tested for the presence of oxygen. The test results show that the patient's blood contains 10^2 milliliters per deciliter of oxygen. What is the concentration of the oxygen in the patient's blood?
A. 10^1
Correct B. 10^2
C. 10^3
D. 10^4

Correct Answer: B

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