POST UTME OSUSTECH 2025 Biology | Objective

Are you preparing for POST UTME OSUSTECH 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.

Practice these randomly selected questions to test your readiness.

Question 1
In the xylem transport system, what is the primary function of the xylem parenchyma cells?
A. To produce xylem sap
Correct B. To store water and minerals
C. To transport xylem sap
D. To regulate xylem sap flow

Correct Answer: B

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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?
Correct A. The cell will swell and burst
B. The cell will shrink and die
C. The cell will remain unchanged
D. The cell will grow and divide

Correct Answer: A

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Question 3
In the process of mitosis, what is the function of the spindle fibers?
A. To separate the chromosomes
B. To attach the chromosomes to the spindle fibers
Correct C. To move the chromosomes to the poles
D. To regulate the cell cycle

Correct Answer: C

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Question 4
A population of rabbits is growing exponentially. If the initial population is 100 and the growth rate is 20% per year, what will be the population after 5 years?
A. 1000
B. 2000
C. 5000
Correct D. 10000

Correct Answer: D

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Question 5
In the process of cellular respiration, what is the function of the electron transport chain?
Correct A. To generate ATP
B. To produce NADH and FADH2
C. To regulate the cell cycle
D. To transport electrons

Correct Answer: A

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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 frequency of the homozygous dominant genotype 'AA'?
Correct A. 0.64
B. 0.36
C. 0.16
D. 0.84

Correct Answer: A

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Question 7
A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. What is the pressure of the gas, assuming it behaves like an ideal gas?
Correct A. 1.01 x 10^5 Pa
B. 2.01 x 10^5 Pa
C. 3.01 x 10^5 Pa
D. 4.01 x 10^5 Pa

Correct Answer: A

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Question 8
A plant has a photosynthetic rate of 10 μmol CO2 s^-1. If the light intensity is 500 μmol m^-2 s^-1, what is the quantum yield of photosynthesis?
A. 0.02
Correct B. 0.04
C. 0.06
D. 0.08

Correct Answer: B

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Question 9
A 50 kg person is s\tanding on a scale in a lift. If the lift is accelerating upwards at 2 m s^-2, what is the reading on the scale?
A. 500 N
Correct B. 550 N
C. 600 N
D. 650 N

Correct Answer: B

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Question 10
A 1.0 L flask contains 0.5 mol of an ideal gas at 27°C. What is the volume of the gas, assuming it behaves like an ideal gas?
Correct A. 2.5 L
B. 1.5 L
C. 0.5 L
D. 0.25 L

Correct Answer: A

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Question 11
The process by which the nervous system coordinates the body's response to a stimulus is known as
Correct A. Reflex Arc
B. Homeostasis
C. Neurotransmission
D. Synaptic Plasticity

Correct Answer: A

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Question 12
The hormone responsible for regulating the body's water balance is
Correct A. ADH
B. Insulin
C. Thyroid Hormone
D. Growth Hormone

Correct Answer: A

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Question 13
The process by which an organism's genetic information is passed from one generation to the next is known as
Correct A. Heritability
B. Evolution
C. Mutation
D. Genetic Drift

Correct Answer: A

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Question 14
The classification of living things into five kingdoms is based on
A. Cell Structure
B. Metabolism
C. Genetic Material
Correct D. Cellular Organization

Correct Answer: D

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Question 15
The process by which an organism's body size increases is known as
Correct A. Growth
B. Development
C. Maturation
D. Differentiation

Correct Answer: A

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Question 16
A study on the genetic variation of a population found that the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'A'?
Correct A. 0.8
B. 0.6
C. 0.4
D. 0.2

Correct Answer: A

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Question 17
A patient is diagnosed with a bacterial infection caused by a strain of Escherichia coli (E. coli) that is resis\tant to multiple antibiotics. Which of the following is a likely mechanism of resis\tance?
A. Efflux pumps
B. Enzymatic degradation of antibiotics
Correct C. Target modification
D. Outer membrane porin loss

Correct Answer: C

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Question 18
A 30-year-old male patient is experiencing symptoms of kidney failure. His serum creatinine level is elevated at 3.5 mg/dL. Which of the following is the most likely cause of his condition?
A. Diabetic nephropathy
Correct B. Hypertensive nephrosclerosis
C. Chronic interstitial nephritis
D. Acute tubular necrosis

Correct Answer: B

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Question 19
A patient is experiencing symptoms of a neuro\logical disorder characterized by involuntary muscle contractions and spasms. Which of the following is the most likely cause of his condition?
A. Multiple sclerosis
B. Amyotrophic lateral sclerosis
Correct C. Huntington's disease
D. Parkinson's disease

Correct Answer: C

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Question 20
A patient is experiencing symptoms of a visual disorder characterized by blurred vision and sensitivity to light. Which of the following is the most likely cause of his condition?
Correct A. Cataract
B. Glaucoma
C. Macular degeneration
D. Diabetic retinopathy

Correct Answer: A

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Question 21
In a population of E. coli, the average generation time is 30 minutes. If the initial population size is 100 cells, and the population doubles every 30 minutes, what is the population size after 2 hours?
A. 1000 cells
Correct B. 2000 cells
C. 4000 cells
D. 8000 cells

Correct Answer: B

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Question 22
A cell membrane is selectively permeable because it contains
A. lipid bilayer
B. protein channels
C. carbohydrate molecules
Correct D. all of the above

Correct Answer: D

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Question 23
The process by which cells become specialized to perform specific functions is called
A. mitosis
B. meiosis
Correct C. differentiation
D. mutation

Correct Answer: C

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Question 24
The main function of the excretory system is to remove
A. waste products
B. excess water
C. excess salts
Correct D. all of the above

Correct Answer: D

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Question 25
The process by which plants make their own food from sunlight is called
Correct A. photosynthesis
B. respiration
C. transpiration
D. translocation

Correct Answer: A

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