POST UTME OAU 2019 Biology | Objective

Are you preparing for POST UTME OAU 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 the context of gas exchange, what is the primary function of the alveolar-capillary membrane?
A. To regulate the pH of the blood
Correct B. To facilitate the diffusion of oxygen into the blood
C. To remove carbon dioxide from the blood
D. To regulate the temperature of the blood

Correct Answer: B

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Question 2
A patient is diagnosed with a condition that affects the regulation of blood pressure. Which of the following hormones is primarily responsible for this regulation?
A. Adrenaline
B. Insulin
C. Aldosterone
Correct D. Angioten\sin II

Correct Answer: D

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Question 3
A species of bird has a unique adaptation that allows it to survive in a desert environment. Which of the following evolutionary theories best explains this adaptation?
Correct A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation

Correct Answer: A

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Question 4
A plant has a root system that is adapted to absorb water from a dry soil. Which of the following transport systems is responsible for this adaptation?
Correct A. Xylem
B. Phloem
C. Cortex
D. Endodermis

Correct Answer: A

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Question 5
A diagram of a nervous system is shown below. Identify the part labeled A.
Correct A. Cerebrum
B. Cerebellum
C. Brainstem
D. Spinal Cord

Correct Answer: A

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Question 6
In a photosynthetic pathway, which of the following pigments is primarily responsible for absorbing light energy in the blue-violet region of the visible spectrum?
A. Chlorophyll a
B. Chlorophyll b
C. Carotenoids
Correct D. Phycobiliproteins

Correct Answer: D

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Question 7
A 40-year-old male patient presents with symptoms of polyuria, polydipsia, and weight loss. His blood glu\cose level is 250 mg/dL. Which of the following is the most likely diagnosis?
Correct A. Type 1 Diabetes Mellitus
B. Type 2 Diabetes Mellitus
C. MODY \( Maturity-Onset Diabetes of the Young \)
D. Secondary Diabetes

Correct Answer: A

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Question 8
A researcher is studying the evolution of a particular species. She collects data on the morpho\logy of the species over a period of 10,000 years. Which of the following is the most likely explanation for the observed changes?
Correct A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation

Correct Answer: A

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Question 9
A 25-year-old female patient presents with symptoms of shortness of breath, fatigue, and palpitations. Her ECG shows a heart rate of 120 beats per minute. Which of the following is the most likely diagnosis?
A. Atrial Fibrillation
B. Ventricular Tachycardia
Correct C. Supraventricular Tachycardia
D. Sinus Tachycardia

Correct Answer: C

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Question 10
A researcher is studying the effect of pH on the activity of an enzyme. She measures the activity of the enzyme at different pH levels and plots the data on a graph. Which of the following is the most likely shape of the graph?
A. Bell-shaped curve
B. U-shaped curve
Correct C. S-shaped curve
D. Linear curve

Correct Answer: C

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Question 11
In a eukaryotic cell, the process of photosynthesis occurs in the mitochondria.
A. True
Correct B. False
C. Photosynthesis occurs in the chloroplasts
D. Photosynthesis occurs in the nucleus

Correct Answer: B

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Question 12
A diagram of the human digestive system is shown below. Identify the part labeled A.
A. Esophagus
Correct B. Stomach
C. Small intestine
D. Large intestine

Correct Answer: B

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Question 13
In the equation \( Delta G = Delta H - TDelta S \), what is the unit of ( Delta G )?
Correct A. Joules
B. Kilocalories
C. Kilowatts
D. Meters

Correct Answer: A

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Question 14
A diagram of the human excretory system is shown below. Identify the part labeled B.
A. Liver
Correct B. Kidney
C. Spleen
D. Pancreas

Correct Answer: B

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Question 15
In a population of 1000 individuals, 70% are homozygous dominant, 20% are homozygous recessive, and 10% are heterozygous. What is the frequency of the recessive allele?
A. 0.2
Correct B. 0.3
C. 0.4
D. 0.5

Correct Answer: B

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Question 16
The diagram below shows the structure of a human eye. Which part of the eye is responsible for detecting light?
A. Cornea
B. Lens
Correct C. Retina
D. Iris

Correct Answer: C

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Question 17
In the classification of living things, which of the following is an example of a domain?
A. Kingdom
B. Phylum
Correct C. Domain
D. Species

Correct Answer: C

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Question 18
The process of asexual reproduction in which an organism produces offspring that are genetically identical to itself is called?
A. Mitosis
B. Meiosis
Correct C. Binary Fission
D. Budding

Correct Answer: C

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Question 19
The diagram below shows the structure of a human kidney. Which part of the kidney is responsible for filtering waste products from the blood?
Correct A. Renal Cortex
B. Renal Medulla
C. Renal Pelvis
D. Ureter

Correct Answer: A

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Question 20
The process of excretion in which the kidneys filter waste products from the blood and excrete them in the form of urine is called?
A. Ureteral Peristalsis
B. Renal Peristalsis
Correct C. Nephron Function
D. Urine Formation

Correct Answer: C

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Question 21
In a closed e\cosystem, the rate of photosynthesis is directly proportional to the rate of respiration. If the rate of photosynthesis is 100 units and the rate of respiration is 80 units, what is the net rate of gas exchange?
A. 20 units
Correct B. 40 units
C. 60 units
D. 80 units

Correct Answer: B

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Question 22
A 2-year-old child is diagnosed with a rare genetic disorder that affects the development of the pancreas. Which of the following is a likely consequence of this disorder?
Correct A. Diabetes mellitus
B. Pancreatitis
C. Pancreatic cancer
D. Pancreatic cysts

Correct Answer: A

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Question 23
A researcher is studying the evolution of a population of birds. She collects data on the beak shape and size of 100 birds. Which of the following statistical tests would be most appropriate to use?
A. t-test
Correct B. ANOVA
C. Regression analysis
D. Chi-square test

Correct Answer: B

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Question 24
A 35-year-old woman is diagnosed with a rare form of cancer that affects the ovaries. Which of the following is a likely consequence of this cancer?
Correct A. Infertility
B. Ovarian torsion
C. Ovarian cysts
D. Ovarian hyperstimulation syndrome

Correct Answer: A

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Question 25
A researcher is studying the effect of a new medication on the growth of a population of bacteria. She collects data on the growth rate of the bacteria over a period of 24 hours. Which of the following statistical tests would be most appropriate to use?
A. t-test
B. ANOVA
Correct C. Regression analysis
D. Chi-square test

Correct Answer: C

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