POST UTME UNN 2018 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 2018 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, which of the following is the primary electron acceptor in the light-dep\endent reactions?
Correct A. P680
B. P700
C. Pheophytin
D. Plastocyanin

Correct Answer: A

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Question 2
A 20-year-old male patient presents with symptoms of fatigue, weakness, and shortness of breath. His hemoglobin level is 8.5 g/dL. Which of the following is the most likely cause of his anemia?
A. Iron deficiency anemia
Correct B. Vitamin B12 deficiency anemia
C. Folate deficiency anemia
D. Sickle cell anemia

Correct Answer: B

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Question 3
A researcher is studying the population dynamics of a rabbit population. The population grows \logistically according to the equation dP/dt = rP\( 1-P/K \). If the carrying capacity K is 1000 and the initial population size is 100, what is the population size after 5 years?
A. 500
B. 750
Correct C. 1000
D. 1250

Correct Answer: C

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Question 4
A 30-year-old female patient presents with symptoms of abdominal pain, nausea, and vomiting. Her blood pressure is 120/80 mmHg. Which of the following is the most likely cause of her condition?
A. Gastroesophageal reflux disease (GERD)
Correct B. Peptic ulcer disease (PUD)
C. Irritable bowel syndrome (IBS)
D. Inflammatory bowel disease (IBD)

Correct Answer: B

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Question 5
A researcher is studying the effect of pH on the activity of the enzyme lactase. The enzyme is most active at a pH of 7.0. Which of the following is the most likely reason for this pH dep\endence?
A. The enzyme has a high pKa value
Correct B. The enzyme has a low pKa value
C. The enzyme is highly sensitive to pH
D. The enzyme is highly resis\tant to pH

Correct Answer: B

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Question 6
In a photosynthetic organism, the light-dep\endent reactions occur in the thylakoid membranes of the chloroplasts. Which of the following is a key component of the light-dep\endent reactions?
A. ATP synthase
Correct B. Photosystem II
C. Rubisco
D. Cytochrome b6f complex

Correct Answer: B

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Question 7
A person with a damaged pituitary gland may experience a deficiency in which hormone, leading to a decrease in growth and development?
Correct A. Growth hormone
B. Thyroid-stimulating hormone
C. Adrenocorticotropic hormone
D. Follicle-stimulating hormone

Correct Answer: A

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Question 8
The process of digestion in the small intestine involves the breakdown of proteins into peptides and amino acids. Which of the following enzymes is responsible for this process?
A. Pep\sin
Correct B. Tryp\sin
C. Chymotryp\sin
D. Lactase

Correct Answer: B

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Question 9
The respiratory system is responsible for the exchange of gases between the body and the environment. Which of the following structures is responsible for the exchange of oxygen and carbon dioxide?
A. Trachea
B. Bronchi
Correct C. Alveoli
D. Diaphragm

Correct Answer: C

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Question 10
The nervous system is responsible for the transmission of signals between different parts of the body. Which of the following structures is responsible for the transmission of signals from sensory receptors to the central nervous system?
A. D\endrites
Correct B. Axons
C. Synapses
D. Neuroglia

Correct Answer: B

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Question 11
In the context of osmoregulation, what is the primary function of the kidneys in a desert-dwelling organism?
Correct A. To conserve water by reabsorbing water from the filtrate
B. To excrete excess salt and water through the urine
C. To regulate electrolyte balance by reabsorbing or excreting ions
D. To produce antidiuretic hormone (ADH) to reduce water loss

Correct Answer: A

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Question 12
A cell is placed in a solution with a higher concentration of glu\cose. What happens 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 lyse due to osmotic shock

Correct Answer: B

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Question 13
What is the primary function of the mitochondria in a cell?
A. To synthesize proteins
B. To store genetic information
Correct C. To generate energy for the cell
D. To regulate cell growth and division

Correct Answer: C

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Question 14
Asexual reproduction in plants can occur through what process?
A. Budding
B. Fragmentation
Correct C. Runners
D. Spores

Correct Answer: C

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Question 15
What is the term for the process by which an organism's genetic information is passed from one generation to the next?
A. Mutation
B. Genetic drift
C. Natural selection
Correct D. Heritability

Correct Answer: D

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Question 16
In a eukaryotic cell, the process of cell division that results in the production of four daughter cells, each with the same number of chromosomes as the parent cell, is known as
Correct A. Mitosis
B. Meiosis
C. Binary Fission
D. Endosymbiosis

Correct Answer: A

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Question 17
The sense organ responsible for detecting changes in sound waves is the
Correct A. Ear
B. Eye
C. Nose
D. Tongue

Correct Answer: A

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Question 18
The process by which plants convert light energy into chemical energy is known as
Correct A. Photosynthesis
B. Respiration
C. Transpiration
D. Osmosis

Correct Answer: A

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Question 19
The hormone responsible for regulating blood sugar levels is
Correct A. Insulin
B. Glucagon
C. Adrenaline
D. Thyroxine

Correct Answer: A

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Question 20
The classification of living things based on cell structure is known as
A. Binomial Nomenclature
B. Phy\logenetic Classification
Correct C. Cellular Classification
D. Morpho\logical Classification

Correct Answer: C

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Question 21
In the process of osmoregulation, what is the primary mechanism by which the kidney regulates the concentration of ions in the blood?
Correct A. Active transport of ions across the renal tubules
B. Passive diffusion of ions across the renal tubules
C. Excretion of excess ions through the urine
D. Reabsorption of ions from the filtrate

Correct Answer: A

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Question 22
Asexual reproduction in plants can occur through the formation of
A. Seeds
Correct B. Spores
C. Buds
D. Rhizomes

Correct Answer: B

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Question 23
In the process of respiration, what is the primary function of the mitochondria?
Correct A. To synthesize ATP from glu\cose
B. To break down glu\cose to produce energy
C. To regulate the concentration of ions in the cell
D. To synthesize proteins from amino acids

Correct Answer: A

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Question 24
In the process of digestion, what is the primary function of the pancreas?
Correct A. To secrete digestive enzymes into the small intestine
B. To secrete hormones that regulate blood sugar levels
C. To regulate the pH of the stomach
D. To secrete mucus that protects the stomach lining

Correct Answer: A

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Question 25
In the process of osmoregulation, what is the primary mechanism by which the kidney regulates the concentration of water in the blood?
A. Active transport of water across the renal tubules
B. Passive diffusion of water across the renal tubules
C. Excretion of excess water through the urine
Correct D. Reabsorption of water from the filtrate

Correct Answer: D

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