POST UTME NILE UNIVERSITY 2017 Biology | Objective

Are you preparing for POST UTME NILE UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2017 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
In the context of evolutionary theory, what is the primary mechanism by which natural selection acts on a population?
A. Genetic drift
B. Mutation
C. Gene flow
Correct D. Differential reproduction

Correct Answer: D

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Question 2
A plant cell is placed in a solution with a high concentration of sucrose. What will happen to the cell's turgor pressure?
A. Increase
Correct B. Decrease
C. Remain the same
D. Become negative

Correct Answer: B

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Question 3
What is the primary function of the xylem in a plant?
Correct A. Transport of water and minerals
B. Transport of sugars and amino acids
C. Support and structure
D. Storage of nutrients

Correct Answer: A

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Question 4
A cell is placed in a hypotonic solution. What will happen to the cell?
A. Shrink
Correct B. Swell
C. Remain the same
D. Become rigid

Correct Answer: B

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Question 5
What is the primary function of the mitochondria in a cell?
Correct A. Generate energy for the cell
B. Synthesize proteins
C. Store nutrients
D. Regulate cell growth

Correct Answer: A

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Question 6
In the context of evolutionary theories, what is the primary mechanism by which genetic drift leads to the loss of genetic variation in a population?
Correct A. Genetic drift is a random process that leads to the loss of genetic variation in a population.
B. Genetic drift is a deterministic process that leads to the loss of genetic variation in a population.
C. Genetic drift is a neutral process that does not affect the loss of genetic variation in a population.
D. Genetic drift is a selective process that leads to the loss of genetic variation in a population.

Correct Answer: A

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Question 7
A patient is diagnosed with a bacterial infection that is resis\tant to multiple antibiotics. Which of the following is the most likely mechanism of resis\tance?
A. The bacteria have developed a mutation in the target enzyme that makes it less susceptible to the antibiotic.
Correct B. The bacteria have developed a efflux pump that removes the antibiotic from the cell.
C. The bacteria have developed a modified target that makes it less accessible to the antibiotic.
D. The bacteria have developed a mechanism to inactivate the antibiotic.

Correct Answer: B

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Question 8
In the context of coordination, what is the primary function of the hypothalamus in regulating body temperature?
Correct A. The hypothalamus regulates body temperature by controlling the rate of heat loss from the body.
B. The hypothalamus regulates body temperature by controlling the rate of heat production in the body.
C. The hypothalamus regulates body temperature by controlling the rate of sweating.
D. The hypothalamus regulates body temperature by controlling the rate of shivering.

Correct Answer: A

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Question 9
A researcher is studying the growth and development of a plant. Which of the following is the primary mechanism by which auxins promote cell elongation?
A. Auxins promote cell elongation by increa\sing the rate of cell division.
B. Auxins promote cell elongation by increa\sing the rate of cell wall synthesis.
Correct C. Auxins promote cell elongation by increa\sing the rate of cell wall relaxation.
D. Auxins promote cell elongation by increa\sing the rate of cell wall deposition.

Correct Answer: C

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Question 10
A patient is diagnosed with a genetic disorder that affects the production of a specific enzyme. Which of the following is the primary consequence of this disorder?
Correct A. The patient will experience a deficiency in the production of the enzyme.
B. The patient will experience an overproduction of the enzyme.
C. The patient will experience a mutation in the gene that codes for the enzyme.
D. The patient will experience a deletion of the gene that codes for the enzyme.

Correct Answer: A

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Question 11
In the context of eco\logical succession, what is the primary mechanism driving the shift from a pioneer community to a climax community?
A. Competition for resources
B. Predation and herbivory
C. Mutualism and symbiotic relationships
Correct D. Nutrient cycling and decomposition

Correct Answer: D

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Question 12
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 x 10^5 Pa
Correct B. 2.02 x 10^5 Pa
C. 3.03 x 10^5 Pa
D. 4.04 x 10^5 Pa

Correct Answer: B

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Question 13
A population of rabbits is growing \logistically according to the equation \( \frac{dP}{dt} = rPleft\( 1 - \frac{P}{K}\right \ \) ). If the initial population is 100 and the carrying capacity is 1000, find the population at time t = 5.
A. 500
B. 750
Correct C. 900
D. 950

Correct Answer: C

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Question 14
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 7
Correct D. 14

Correct Answer: D

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Question 15
A 50-g sample of a subs\tance is found to have a mass of 25 g after being placed in a vacuum. What is the density of the subs\tance?
A. 0.5 g/cm^3
Correct B. 1.0 g/cm^3
C. 1.5 g/cm^3
D. 2.0 g/cm^3

Correct Answer: B

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Question 16
In the process of osmoregulation, what is the primary mechanism by which the kidneys regulate the concentration of ions in the blood?
Correct A. Active transport of ions across the renal tubules
B. Passive diffusion of ions across the renal tubules
C. Excretion of excess ions through the urine
D. Reabsorption of ions from the filtrate

Correct Answer: A

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Question 17
Asexual reproduction in plants can occur through the production of
A. seeds
Correct B. spores
C. buds
D. runners

Correct Answer: B

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Question 18
The process of digestion in the small intestine involves the breakdown of proteins into
Correct A. sugars and amino acids
B. fats and carbohydrates
C. proteins and nucleic acids
D. glycogen and starch

Correct Answer: A

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Question 19
The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation if there is no
A. mutation
B. genetic drift
Correct C. natural selection
D. gene flow

Correct Answer: C

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Question 20
The diagram below shows a cross-section of a plant root. Which of the following structures is responsible for the absorption of water and minerals from the soil?
A. A
Correct B. B
C. C
D. Both B and C

Correct Answer: B

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Question 21
In a population of 1000 individuals, 80% are heterozygous for the ABO blood group gene, 15% are homozygous dominant, and 5% are homozygous recessive. What is the genotype and phenotype of the individual with the highest frequency?
Correct A. Genotype: AA, Phenotype: Type A
B. Genotype: AO, Phenotype: Type A
C. Genotype: OO, Phenotype: Type O
D. Genotype: AO, Phenotype: Type O

Correct Answer: A

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Question 22
A plant with the genotype RrSs is crossed with a plant with the genotype RRSS. What is the probability that the offspring will have the genotype RrSs?
A. 1/4
Correct B. 1/2
C. 3/4
D. 1

Correct Answer: B

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Question 23
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. What is the maximum speed of the block?
A. 0.5 m/s
B. 1.0 m/s
Correct C. 1.5 m/s
D. 2.0 m/s

Correct Answer: C

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Question 24
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the pH of the resulting solution?
Correct A. 7
B. 8
C. 9
D. 10

Correct Answer: A

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Question 25
A 10 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 5 mL of NaOH has been added?
A. 2
B. 3
Correct C. 4
D. 5

Correct Answer: C

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