POST UTME REDEEMERS UNIVERSITY 2025 Biology | Objective

Are you preparing for POST UTME REDEEMERS 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 Drosophila melanogaster, the frequency of the recessive allele 'b' for black eyes is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'B'B'?
A. 0.16
B. 0.32
Correct C. 0.64
D. 0.8

Correct Answer: C

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Question 2
A diagram of a plant cell is shown below. Identify the structure labeled 'X'.
A. A
B. B
C. C
Correct D. D

Correct Answer: D

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Question 3
A 2.5-liter solution of 0.15 M NaCl is prepared by dissolving 0.375 g of NaCl in water. What is the molarity of the solution?
A. 0.06
B. 0.09
Correct C. 0.12
D. 0.15

Correct Answer: C

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Question 4
A diagram of a simple harmonic motion is shown below. Identify the phase angle.
A. 0
Correct B. \frac{\pi}{2}
C. \pi
D. 2\pi

Correct Answer: B

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Question 5
A 5.0-g sample of a compound is analyzed by combustion analysis. The mass of the carbon dioxide produced is 3.2 g. What is the percentage of carbon in the compound?
A. 40.0
B. 50.0
C. 60.0
Correct D. 64.0

Correct Answer: D

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Question 6
In the context of hormonal coordination, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?
A. Regulation of body temperature
B. Maintenance of blood pressure
C. Stimulation of the immune system
Correct D. Response to stress and anxiety

Correct Answer: D

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Question 7
A freshwater e\cosystem is characterized by a high concentration of dissolved oxygen. What is the primary source of this oxygen?
Correct A. Photosynthesis by aquatic plants
B. Respiration by aquatic animals
C. Decomposition of organic matter
D. Atmospheric diffusion

Correct Answer: A

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Question 8
A population of rabbits is introduced to a new island. Over time, the population grows exponentially. What is the primary factor driving this growth?
A. Availability of food
Correct B. Absence of predators
C. Genetic adaptation
D. Environmental factors

Correct Answer: B

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Question 9
A patient is diagnosed with a kidney disorder that affects the reabsorption of glu\cose in the renal tubules. What is the primary consequence of this disorder?
A. Hypoglycemia
Correct B. Hyperglycemia
C. Diabetes mellitus
D. Kidney failure

Correct Answer: B

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Question 10
A diagram of the human circulatory system is shown below. What is the primary function of the pulmonary artery?
A. Transportation of oxygenated blood
Correct B. Transportation of deoxygenated blood
C. Regulation of blood pressure
D. Maintenance of blood pH

Correct Answer: B

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Question 11
In the process of osmoregulation, what is the primary function of the kidneys in a hypertonic environment?
A. To excrete excess water
Correct B. To reabsorb excess ions
C. To regulate blood pH
D. To maintain electrolyte balance

Correct Answer: B

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Question 12
A diagram of the xylem and phloem in a plant stem is shown below. What is the primary function of the xylem?
Correct A. To transport water and minerals
B. To transport sugars and amino acids
C. To regulate plant growth
D. To maintain plant temperature

Correct Answer: A

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Question 13
In the human eye, what is the primary function of the retina?
A. To focus light on the lens
Correct B. To detect light and transmit signals to the brain
C. To regulate eye movement
D. To maintain eye pressure

Correct Answer: B

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Question 14
A diagram of the human respiratory system is shown below. What is the primary function of the diaphragm?
Correct A. To expand and contract the chest cavity
B. To regulate blood pressure
C. To maintain lung function
D. To regulate body temperature

Correct Answer: A

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Question 15
In the human body, what is the primary function of the pancreas?
A. To produce digestive enzymes
Correct B. To regulate blood sugar levels
C. To maintain kidney function
D. To regulate body temperature

Correct Answer: B

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Question 16
The bacterium Escherichia coli (E. coli) is a Gram-negative, rod-shaped bacterium that is commonly found in the human gut. Which of the following is a characteristic of E. coli that contributes to its pathogenicity?
Correct A. Its ability to produce virulence factors such as Shiga toxin
B. Its ability to adhere to host cells
C. Its ability to invade host cells
D. Its ability to resist antibiotics

Correct Answer: A

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Question 17
The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation in the absence of certain factors. Which of the following is NOT a factor that can cause a change in allele frequency?
A. Mutation
B. Gene flow
C. Genetic drift
Correct D. Natural selection

Correct Answer: D

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Question 18
The process of photosynthesis in plants involves the conversion of light energy into chemical energy. Which of the following is a byproduct of photosynthesis?
Correct A. Oxygen
B. Carbon dioxide
C. Water
D. Glu\cose

Correct Answer: A

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Question 19
The concept of symbiosis refers to the close and often long-term relationship between different bio\logical species. Which of the following is an example of mutualism, a type of symbiosis?
A. Commensalism
B. Parasitism
Correct C. Mutualism
D. Amensalism

Correct Answer: C

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Question 20
The process of mitosis is a type of cell division that results in two daughter cells that are genetically identical to the parent cell. Which of the following stages of mitosis is characterized by the condensation of chromosomes?
Correct A. Prophase
B. Metaphase
C. Anaphase
D. Telophase

Correct Answer: A

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Question 21
In a eukaryotic cell, the process of cell division that results in the production of four daughter cells is known as
Correct A. Mitosis
B. Meiosis
C. Binary Fission
D. Endoreduplication

Correct Answer: A

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Question 22
The process by which plants convert light energy into chemical energy is known as
A. Respiration
Correct B. Photosynthesis
C. Transpiration
D. Osmosis

Correct Answer: B

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Question 23
The transport of water and minerals from the roots to the leaves of a plant is known as
A. Transpiration
B. Osmosis
C. Diffusion
Correct D. Translocation

Correct Answer: D

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Question 24
The process by which cells become specialized to perform specific functions is known as
Correct A. Differentiation
B. Mitosis
C. Meiosis
D. Endoreduplication

Correct Answer: A

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Question 25
The movement of molecules from an area of high concentration to an area of low concentration is known as
A. Osmosis
Correct B. Diffusion
C. Active Transport
D. Passive Transport

Correct Answer: B

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