POST UTME UNN 2019 Biology | Objective

Are you preparing for POST UTME UNN exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2019 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In a typical terrestrial e\cosystem, what is the primary function of the xylem tissue in plants?
Correct A. Transport of water and minerals from the roots to the leaves
B. Production of glu\cose through photosynthesis
C. Storage of nutrients and water in the stem
D. Regulation of stomatal opening and clo\sing

Correct Answer: A

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Question 2
A patient presents with symptoms of fever, headache, and body aches. A blood smear reveals the presence of ring-shaped parasites. What is the most likely diagnosis?
Correct A. Malaria
B. Typhoid fever
C. Lyme disease
D. Leptospirosis

Correct Answer: A

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Question 3
A diagram of the human eye is shown below. What is the primary function of the lens?
Correct A. To focus light on the retina
B. To regulate the amount of light entering the eye
C. To detect movement and changes in the visual field
D. To produce tears to lubricate the eye

Correct Answer: A

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Question 4
A diagram of the human brain is shown below. What is the primary function of the cerebral cortex?
A. To regulate body temperature
B. To control voluntary movements
Correct C. To process sensory information
D. To produce hormones

Correct Answer: C

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Question 5
A diagram of a typical terrestrial e\cosystem is shown below. What is the primary function of the decomposers in this e\cosystem?
A. To produce glu\cose through photosynthesis
Correct B. To break down dead organic matter
C. To regulate the amount of light entering the e\cosystem
D. To detect movement and changes in the e\cosystem

Correct Answer: B

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Question 6
In the process of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
Correct B. To pump protons across the mitochondrial inner membrane
C. To reduce NADH and FADH2 to NAD+ and FAD
D. To produce water and carbon dioxide as byproducts

Correct Answer: B

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Question 7
A plant's xylem is responsible for transporting what type of subs\tance?
Correct A. Water and minerals from the roots to the leaves
B. Sugars and amino acids from the leaves to the roots
C. Hormones and other signaling molecules throughout the plant
D. Waste products and excess ions from the leaves to the roots

Correct Answer: A

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Question 8
In the human kidney, what is the primary function of the nephron?
Correct A. To filter waste products from the blood
B. To regulate the amount of water in the body
C. To produce hormones that stimulate the production of red blood cells
D. To store excess ions and minerals for later use

Correct Answer: A

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Question 9
What is the primary difference between a simple epithelium and a stratified epithelium?
Correct A. Simple epithelium has a \single layer of cells, while stratified epithelium has multiple layers
B. Simple epithelium is found in the skin, while stratified epithelium is found in the lining of the digestive tract
C. Simple epithelium is responsible for absorption, while stratified epithelium is responsible for secretion
D. Simple epithelium is found in the lining of the blood vessels, while stratified epithelium is found in the lining of the lungs

Correct Answer: A

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Question 10
In the process of mitosis, what is the primary function of the anaphase stage?
Correct A. To separate the sister chromatids and move them to opposite poles of the cell
B. To condense the chromosomes and prepare them for separation
C. To decondense the chromosomes and prepare them for cell division
D. To repair any damaged chromosomes before cell division

Correct Answer: A

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Question 11
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'?
A. 0.36
Correct B. 0.64
C. 0.8
D. 0.16

Correct Answer: B

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Question 12
A cell in interphase has a DNA content of 8.0 pg. If the cell enters mitosis and undergoes one round of DNA replication, what will be the DNA content of the daughter cells?
Correct A. 16.0 pg
B. 8.0 pg
C. 4.0 pg
D. 32.0 pg

Correct Answer: A

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Question 13
A 10% solution of glu\cose is diluted to 5% by adding water. What is the ratio of the initial volume to the final volume?
A. 1:2
Correct B. 1:3
C. 2:3
D. 3:4

Correct Answer: B

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Question 14
A plant grows in a region with a 12-hour day and an 8-hour night. What is the approximate duration of the photoperiod?
Correct A. 12 hours
B. 8 hours
C. 20 hours
D. 16 hours

Correct Answer: A

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Question 15
A 20-kg object is attached to a horizontal spring with a force cons\tant of 100 N/m. If the object is displaced by 0.2 m from its equilibrium position, what is the magnitude of the restoring force?
A. 20 N
B. 40 N
Correct C. 80 N
D. 100 N

Correct Answer: C

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Question 16
The process of osmoregulation in animals involves the regulation of water and electrolyte balance. Which of the following is a key mechanism involved in osmoregulation in the kidneys?
A. Reabsorption of glu\cose and amino acids
B. Excretion of excess sodium ions
Correct C. Production of antidiuretic hormone (ADH)
D. Regulation of blood pressure through the renin-angioten\sin-aldosterone system

Correct Answer: C

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Question 17
In the context of evolutionary theory, what is the term for the process by which a population becomes reproductively isolated from other populations, leading to the formation of new species?
Correct A. Speciation
B. Adaptation
C. Natural selection
D. Genetic drift

Correct Answer: A

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Question 18
The nervous system is responsible for transmitting signals between different parts of the body. Which of the following is a type of neuron that plays a key role in the transmission of signals?
A. Sensory neuron
B. Motor neuron
Correct C. Interneuron
D. Glia cell

Correct Answer: C

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Question 19
The process of excretion in animals involves the removal of waste products from the body. Which of the following is a key organ involved in the excretion of waste products?
Correct A. Kidneys
B. Liver
C. Lungs
D. Skin

Correct Answer: A

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Question 20
The process of osmoregulation in animals involves the regulation of water and electrolyte balance. Which of the following is a key mechanism involved in osmoregulation in the kidneys?
A. Reabsorption of glu\cose and amino acids
B. Excretion of excess sodium ions
Correct C. Production of antidiuretic hormone (ADH)
D. Regulation of blood pressure through the renin-angioten\sin-aldosterone system

Correct Answer: C

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Question 21
In a population of E. coli, the average generation time is 30 minutes. If the population size is 10^6 cells, and the growth rate is 0.5 h^-1, what is the expected population size after 2 hours?
A. 5.0 x 10^6
B. 1.0 x 10^7
Correct C. 2.5 x 10^7
D. 1.0 x 10^8

Correct Answer: C

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Question 22
A patient with a blood pH of 7.2 is administered a solution of 0.9% NaCl. If the patient's blood volume is 5 L, and the solution is administered at a rate of 100 mL/min, what is the expected change in blood pH after 30 minutes?
A. 7.1
Correct B. 7.3
C. 7.4
D. 7.5

Correct Answer: B

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Question 23
A 2-year-old child is diagnosed with acute otitis media. The child's tympanic membrane is bulging, and the middle ear is filled with fluid. What is the most likely cause of this condition?
A. Viral infection
Correct B. Bacterial infection
C. Fungal infection
D. Allergies

Correct Answer: B

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Question 24
A 35-year-old woman is diagnosed with hypertension. Her blood pressure is 160/100 mmHg. What is the most likely cause of her hypertension?
Correct A. Kidney disease
B. Heart disease
C. Liver disease
D. Obesity

Correct Answer: A

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Question 25
A 45-year-old man is diagnosed with type 2 diabetes. His fasting blood glu\cose level is 250 mg/dL. What is the most likely cause of his hyperglycemia?
Correct A. Insulin resis\tance
B. Pancreatic \beta-cell dysfunction
C. Liver disease
D. Obesity

Correct Answer: A

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