POST UTME OAU 2021 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 2021 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
A study on the structure of the human eye revealed that the cornea accounts for approximately 2/3 of the eye's total re\fractive power. If the eye's focal length is 1.8 cm, what is the focal length of the cornea?
Correct A. 1.2 cm
B. 1.5 cm
C. 2.4 cm
D. 3.6 cm

Correct Answer: A

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Question 2
The diagram below shows the structure of a plant cell. Which part of the cell is responsible for photosynthesis?
A. Vacuole
Correct B. Chloroplast
C. Mitochondria
D. Cell wall

Correct Answer: B

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Question 3
A population of bacteria is growing exponentially. If the initial population is 100 and the population doubles every 2 hours, what is the population after 6 hours?
A. 1600
B. 3200
Correct C. 6400
D. 12800

Correct Answer: C

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Question 4
The diagram below shows a simple circuit. If the battery is 9V and the resis\tance of the circuit is 10 ohms, what is the current flowing through the circuit?
Correct A. 0.9 A
B. 1.8 A
C. 2.7 A
D. 3.6 A

Correct Answer: A

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Question 5
The diagram below shows the structure of a human eye. Which part of the eye is responsible for adjusting the size of the pupil?
A. Cornea
Correct B. Iris
C. Lens
D. Retina

Correct Answer: B

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Question 6
In the context of photosynthesis, what is the role of the enzyme RuBisCO in the Calvin cycle?
Correct A. It catalyzes the conversion of CO2 to a 3-carbon molecule.
B. It is involved in the light-dep\endent reactions.
C. It is a key enzyme in the breakdown of starch.
D. It is responsible for the synthesis of ATP.

Correct Answer: A

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Question 7
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
Correct A. To focus light on the retina.
B. To re\fract light entering the eye.
C. To absorb excess light.
D. To produce tears.

Correct Answer: A

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Question 8
In the context of hormonal coordination, what is the primary function of the hormone insulin?
Correct A. To regulate blood glu\cose levels.
B. To stimulate the breakdown of glycogen.
C. To increase the rate of respiration.
D. To decrease the rate of digestion.

Correct Answer: A

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Question 9
A diagram of the human circulatory system is shown below. What is the function of the part labeled 'B'?
A. To pump blood to the lungs.
Correct B. To pump blood to the rest of the body.
C. To regulate blood pressure.
D. To filter waste products.

Correct Answer: B

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Question 10
In the context of gas exchange, what is the primary function of the alveoli in the lungs?
Correct A. To exchange oxygen and carbon dioxide.
B. To regulate body temperature.
C. To produce mucus.
D. To filter dust particles.

Correct Answer: A

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Question 11
In a typical e\cosystem, what is the primary role of xylem in plants?
Correct A. Transporting water and minerals from roots to leaves
B. Producing glu\cose through photosynthesis
C. Storing food in the form of starch
D. Regulating temperature in the plant body

Correct Answer: A

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Question 12
A researcher is studying the effects of pH on the growth of E. coli bacteria. Which of the following is a likely consequence of a high pH environment?
A. Increased growth rate
Correct B. Decreased growth rate
C. No effect on growth rate
D. Increased mortality rate

Correct Answer: B

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Question 13
A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?
Correct A. Cell wall
B. Chloroplast
C. Mitochondria
D. Nucleus

Correct Answer: A

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Question 14
A patient is diagnosed with a bacterial infection. Which of the following antibiotics is most likely to be effective against the infection?
Correct A. Penicillin
B. Erythromycin
C. Tetracycline
D. Ciprofloxacin

Correct Answer: A

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Question 15
A diagram of a human eye is shown below. What is the function of the structure labeled 'B'?
A. Cornea
Correct B. Iris
C. Lens
D. Retina

Correct Answer: B

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Question 16
In the context of respiratory physio\logy, what is the primary function of the parasympathetic nervous system in the regulation of breathing?
A. To increase the rate and depth of breathing
Correct B. To decrease the rate and depth of breathing
C. To regulate the volume of the lungs
D. To control the rate of gas exchange

Correct Answer: B

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Question 17
A patient with a severe case of tuberculosis is being treated with a combination of antibiotics. Which of the following is a common side effect of one of the antibiotics used in the treatment?
A. Nausea and vomiting
Correct B. Diarrhea and abdominal pain
C. Rash and itching
D. Hearing loss and tinnitus

Correct Answer: B

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Question 18
A diagram of the human circulatory system is shown below. What is the function of the tricuspid valve?
Correct A. To prevent backflow of blood into the right atrium
B. To regulate the pressure in the pulmonary artery
C. To control the rate of blood flow into the left ventricle
D. To facilitate the exchange of oxygen and carbon dioxide

Correct Answer: A

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Question 19
A patient with a severe case of diabetes is being treated with insulin. Which of the following is a common side effect of insulin therapy?
Correct A. Hypoglycemia
B. Hyperglycemia
C. Weight gain
D. Fatigue and weakness

Correct Answer: A

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Question 20
A diagram of the human respiratory system is shown below. What is the function of the alveoli?
A. To regulate the volume of the lungs
B. To control the rate of gas exchange
C. To regulate the pressure in the pulmonary artery
Correct D. To facilitate the exchange of oxygen and carbon dioxide

Correct Answer: D

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Question 21
In a population of 1000 individuals, the frequency of the dominant allele (A) is 0.6, and the frequency of the recessive allele (a) is 0.4. What is the expected frequency of the homozygous dominant genotype (AA)?
Correct A. 0.36
B. 0.48
C. 0.64
D. 0.72

Correct Answer: A

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Question 22
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth rate of the bacteria at different pH levels and plots the data on a graph. Which of the following best describes the relationship between pH and growth rate?
A. Directly proportional
Correct B. Inversely proportional
C. No relationship
D. U-shaped

Correct Answer: B

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Question 23
A plant has a photosynthetic rate of 10 μmol CO2 s-1. If the plant is exposed to light for 8 hours, how much CO2 will be fixed?
A. 80 μmol CO2
Correct B. 160 μmol CO2
C. 240 μmol CO2
D. 320 μmol CO2

Correct Answer: B

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Question 24
A patient has a blood pressure of 120/80 mmHg. If the patient's heart rate is 70 beats per minute, what is the cardiac output?
Correct A. 8400 mL min-1
B. 840 mL min-1
C. 84 mL min-1
D. 8.4 mL min-1

Correct Answer: A

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Question 25
A researcher is studying the effect of antibiotics on the growth of bacteria. The researcher measures the growth rate of the bacteria at different concentrations of antibiotics and plots the data on a graph. Which of the following best describes the relationship between antibiotic concentration and growth rate?
A. Directly proportional
Correct B. Inversely proportional
C. No relationship
D. U-shaped

Correct Answer: B

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