POST UTME OAU 2025 Biology | Objective

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Question 1 View Details
In the context of evolutionary theories, what is the primary mechanism by which natural selection acts on genetic variation?
A. Genetic drift
B. Gene flow
C. Mutation
Correct D. Selection pressure

Correct Answer: D

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Question 2 View Details
Which of the following tissues is primarily responsible for the production of digestive enzymes in the small intestine?
A. Stratified squamous epithelium
Correct B. Simple columnar epithelium
C. Stratified cuboidal epithelium
D. Simple cuboidal epithelium

Correct Answer: B

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Question 3 View Details
A diagram of the human circulatory system is shown below. Identify the structure labeled 'A'.
Correct A. Aorta
B. Pulmonary artery
C. Coronary artery
D. Femoral artery

Correct Answer: A

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Question 4 View Details
A cell is placed in a solution with a high concentration of salt. What will happen to the cell?
A. The cell will swell and eventually burst.
Correct B. The cell will shrink and lose water.
C. The cell will remain unchanged.
D. The cell will undergo mitosis.

Correct Answer: B

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Question 5 View Details
A diagram of a plant's xylem tissue is shown below. Identify the structure labeled 'A'.
A. Xylem vessel
Correct B. Tracheid
C. Phloem
D. Parenchyma

Correct Answer: B

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Question 6 View Details
In the context of evolutionary bio\logy, what is the primary mechanism driving the process of speciation in a population of organisms?
A. Genetic drift
Correct B. Natural selection
C. Gene flow
D. Mutation

Correct Answer: B

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Question 7 View Details
A diagram of a plant's xylem and phloem tissues is shown below. Which of the following statements is true regarding the transport of water and nutrients in this plant?
A. Water and nutrients are transported through the xylem and phloem, respectively.
B. Water and nutrients are transported through the phloem and xylem, respectively.
Correct C. Water is transported through the xylem, while nutrients are transported through the phloem.
D. Water and nutrients are transported through both the xylem and phloem.

Correct Answer: C

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Question 8 View Details
A diagram of a human heart is shown below. Which of the following statements is true regarding the structure of the heart?
Correct A. The heart has four chambers: two atria and two ventricles.
B. The heart has three chambers: two atria and one ventricle.
C. The heart has two chambers: one atrium and one ventricle.
D. The heart has no chambers.

Correct Answer: A

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Question 9 View Details
A diagram of a plant's reproductive structure is shown below. Which of the following statements is true regarding the process of pollination?
Correct A. Pollination occurs when pollen is transferred from the stamen to the pistil.
B. Pollination occurs when pollen is transferred from the pistil to the stamen.
C. Pollination occurs when the stamen and pistil are separate.
D. Pollination occurs when the stamen and pistil are combined.

Correct Answer: A

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Question 10 View Details
A diagram of a human cell is shown below. Which of the following statements is true regarding the structure of the cell?
Correct A. The cell has a nucleus and mitochondria.
B. The cell has a nucleus but no mitochondria.
C. The cell has no nucleus but has mitochondria.
D. The cell has no nucleus or mitochondria.

Correct Answer: A

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Question 11 View Details
In the context of classification of living things, what is the primary function of the kingdom level?
Correct A. To group organisms based on their cell structure
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: A

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Question 12 View Details
A plant cell has a cell wall, chloroplasts, and a large vacuole. What is the primary function of the cell wall?
Correct A. To provide structural support to the cell
B. To regulate the movement of materials in and out of the cell
C. To produce energy for the cell
D. To synthesize proteins

Correct Answer: A

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Question 13 View Details
A genetic trait is said to be dominant if it will be expressed in an individual even if the individual has one copy of the recessive allele. What is the genotype of an individual who is homozygous dominant for the trait?
Correct A. AA
B. Aa
C. aa
D. Ab

Correct Answer: A

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Question 14 View Details
A microorganism is said to be anaerobic if it can survive and grow in the absence of oxygen. What is the primary source of energy for anaerobic microorganisms?
A. Glu\cose
B. Glycolysis
Correct C. Fermentation
D. Respiration

Correct Answer: C

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Question 15 View Details
The xylem is a type of vascular tissue found in plants that is responsible for transporting water and minerals from the roots to the leaves. What is the primary function of the xylem in the context of plant transport systems?
Correct A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the roots
C. To provide structural support to the plant
D. To synthesize proteins

Correct Answer: A

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Question 16 View Details
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'R'?
Correct A. 0.8
B. 0.6
C. 0.4
D. 0.2

Correct Answer: A

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Question 17 View Details
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will have the genotype 'TT'?
Correct A. 0.25
B. 0.5
C. 0.75
D. 0.9

Correct Answer: A

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Question 18 View Details
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 20% per hour, what will be the population size after 3 hours?
A. 1600
B. 1800
Correct C. 2000
D. 2200

Correct Answer: C

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Question 19 View Details
A plant with the genotype 'RR' is crossed with a plant with the genotype 'Rr'. What is the probability that the offspring will have the genotype 'rr'?
Correct A. 0.25
B. 0.5
C. 0.75
D. 0.9

Correct Answer: A

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Question 20 View Details
A population of rabbits is growing exponentially. If the initial population size is 50 and the growth rate is 15% per month, what will be the population size after 6 months?
A. 1100
B. 1200
Correct C. 1300
D. 1400

Correct Answer: C

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Question 21 View Details
In the context of evolutionary theories, what is the primary mechanism by which natural selection acts on populations?
A. Genetic drift
B. Gene flow
C. Mutation
Correct D. Natural selection

Correct Answer: D

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Question 22 View Details
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
Correct A. To focus light on the retina
B. To detect movement
C. To regulate pupil size
D. To produce tears

Correct Answer: A

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Question 23 View Details
In the context of osmoregulation, what is the primary mechanism by which the kidneys regulate the concentration of ions in the blood?
Correct A. Active transport
B. Passive transport
C. Osmosis
D. Diffusion

Correct Answer: A

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Question 24 View Details
A diagram of the human skeletal system is shown below. What is the function of the part labeled 'B'?
Correct A. To protect the brain
B. To produce blood cells
C. To store fat
D. To support the body

Correct Answer: A

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Question 25 View Details
In the context of classification of living things, what is the primary characteristic used to distinguish between prokaryotic and eukaryotic cells?
Correct A. Presence of a nucleus
B. Presence of mitochondria
C. Presence of a cell wall
D. Presence of chloroplasts

Correct Answer: A

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