POST UTME ABU 2024 Biology | Objective

Are you preparing for POST UTME ABU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2024 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In a photosynthetic pathway, what is the primary function of the enzyme RuBisCO?
Correct A. Fixation of CO2
B. Reduction of NADP+
C. Regeneration of RuBP
D. Oxidation of NADPH

Correct Answer: A

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Question 2
A diagram of the human respiratory system is shown below. Identify the structure labeled 'A'?
A. Trachea
Correct B. Lungs
C. Diaphragm
D. Bronchi

Correct Answer: B

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Question 3
A plant cell is shown below. Identify the structure labeled 'X'?
Correct A. Cell Wall
B. Vacuole
C. Chloroplast
D. Mitochondria

Correct Answer: A

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Question 4
A diagram of the human circulatory system is shown below. Identify the structure labeled 'Z'?
Correct A. Heart
B. Aorta
C. Pulmonary Artery
D. Coronary Artery

Correct Answer: A

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Question 5
A diagram of the human digestive system is shown below. Identify the structure labeled 'V'?
Correct A. Stomach
B. Small Intestine
C. Large Intestine
D. Liver

Correct Answer: A

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Question 6
In a photosynthetic pathway, what is the primary function of the enzyme RuBisCO?
Correct A. Fixing CO2 into a 3-carbon molecule
B. Converting RuBP into 2 PGA molecules
C. Regenerating RuBP from 3 PGA molecules
D. Reducing NADP+ to NADPH

Correct Answer: A

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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 would be the most appropriate buffer to use in this experiment?
A. Phosphate buffer
B. Citrate buffer
Correct C. Tris buffer
D. Borate buffer

Correct Answer: C

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Question 8
A plant cell is placed in a solution with a high concentration of sucrose. What would be the effect on the cell's turgor pressure?
Correct A. Increase
B. Decrease
C. No change
D. Variable

Correct Answer: A

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Question 9
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: A and a. The geneticist wants to determine the genotype and phenotype of the offspring of a cross between two heterozygous parents. What would be the expected genotype and phenotype of the offspring?
A. Genotype: AA, Phenotype: A
Correct B. Genotype: Aa, Phenotype: A
C. Genotype: aa, Phenotype: a
D. Genotype: AA, Phenotype: a

Correct Answer: B

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Question 10
A cell is placed in a solution with a high concentration of glu\cose. What would be the effect on the cell's membrane potential?
A. Hyperpolarization
Correct B. Depolarization
C. No change
D. Variable

Correct Answer: B

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Question 11
In a typical e\cosystem, what is the primary function of the digestive system in a herbivorous mammal?
Correct A. To break down and absorb nutrients from the consumed plant material
B. To excrete waste products of metabolism
C. To regulate body temperature
D. To produce digestive enzymes

Correct Answer: A

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Question 12
A plant cell is placed in a solution with a high concentration of sucrose. What will happen to the cell?
A. The cell will shrink due to water loss
Correct B. The cell will swell due to water uptake
C. The cell will remain unchanged
D. The cell will burst due to osmotic pressure

Correct Answer: B

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Question 13
A species of bird has a beak shape that is well-suited for cracking open nuts. What is an example of this adaptation?
Correct A. Natural selection
B. Genetic drift
C. Gene flow
D. Genetic variation

Correct Answer: A

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Question 14
A human kidney is filtering waste products from the blood. What is the primary function of the nephrons in the kidney?
A. To produce urine
Correct B. To filter waste products from the blood
C. To regulate blood pressure
D. To produce hormones

Correct Answer: B

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Question 15
A species of fish has a unique adaptation that allows it to survive in low-oxygen environments. What is an example of this adaptation?
Correct A. Lamellate gills
B. Branchial respiration
C. Cu\taneous respiration
D. Branchial respiration

Correct Answer: A

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Question 16
The process of meiosis in a diploid cell results in the production of four haploid cells. Which of the following statements is true regarding the genetic variation in these cells?
A. The four haploid cells have the same genetic makeup as the parent cell.
Correct B. The four haploid cells have a 50% chance of inheriting the dominant allele and a 50% chance of inheriting the recessive allele.
C. The four haploid cells have a 25% chance of inheriting the dominant allele and a 75% chance of inheriting the recessive allele.
D. The four haploid cells have a 75% chance of inheriting the dominant allele and a 25% chance of inheriting the recessive allele.

Correct Answer: B

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Question 17
A population of rabbits is growing exponentially. If the initial population size is 100 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 18
A geneticist is studying the inheri\tance of a particular trait in a family. The trait is determined by a \single gene with two alleles: A and a. The geneticist finds that the offspring of two heterozygous parents (Aa x Aa) have a 25% chance of inheriting the dominant allele A and a 75% chance of inheriting the recessive allele a. What is the genotype of the parents?
Correct A. Aa x Aa
B. AA x aa
C. Aa x AA
D. aa x aa

Correct Answer: A

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Question 19
A bacterium is growing in a culture medium. The growth rate of the bacterium is proportional to the amount of food available in the medium. If the initial population size is 100 and the growth rate is 0.5 per hour, what will be the population size after 2 hours?
A. 200
B. 400
Correct C. 600
D. 800

Correct Answer: C

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Question 20
A population of birds is declining due to habitat loss. If the initial population size is 1000 and the decline rate is 10% per year, what will be the population size after 5 years?
Correct A. 500
B. 750
C. 1000
D. 1250

Correct Answer: A

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