POST UTME ABU 2023 Biology | Objective

Are you preparing for POST UTME ABU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
In the context of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
B. To produce NADH and FADH2
Correct C. To pump protons across the mitochondrial membrane
D. To reduce oxygen to water

Correct Answer: C

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Question 2
A researcher is studying the effect of pH on the activity of the enzyme lactase. Which of the following best describes the relationship between pH and enzyme activity?
A. pH has a direct, linear relationship with enzyme activity
Correct B. pH has an inverse, \logarithmic relationship with enzyme activity
C. pH has a direct, \logarithmic relationship with enzyme activity
D. pH has no effect on enzyme activity

Correct Answer: B

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Question 3
A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?
A. To synthesize proteins
Correct B. To store genetic information
C. To regulate cell growth
D. To transport materials across the cell membrane

Correct Answer: B

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Question 4
A diagram of a circuit is shown below. What is the function of the component labeled 'B'?
A. To increase the voltage across the circuit
B. To decrease the current through the circuit
Correct C. To regulate the flow of electrons
D. To store electrical energy

Correct Answer: C

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Question 5
A researcher is studying the effect of temperature on the growth of a microorganism. Which of the following best describes the relationship between temperature and growth rate?
Correct A. Temperature has a direct, linear relationship with growth rate
B. Temperature has an inverse, \logarithmic relationship with growth rate
C. Temperature has a direct, \logarithmic relationship with growth rate
D. Temperature has no effect on growth rate

Correct Answer: A

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Question 6
In a population of 1000 individuals, 200 are infected with a disease that has a 20% mortality rate. If the disease is caused by a bacterium that has a generation time of 2 hours, what is the expected number of new infections after 10 hours?
A. 160
B. 320
Correct C. 640
D. 1280

Correct Answer: C

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Question 7
A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, what is the maximum speed of the block?
A. 2.2 m/s
Correct B. 4.4 m/s
C. 6.6 m/s
D. 8.8 m/s

Correct Answer: B

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Question 8
A plant grows in a nutrient-poor soil. Which of the following adaptations would be most beneficial for the plant?
A. Deep roots to access water
B. Large leaves to increase photosynthesis
C. Small leaves to reduce transpiration
Correct D. Thick cuticle to prevent water loss

Correct Answer: D

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Question 9
A 0.5 M solution of NaCl is prepared by dissolving 25 g of NaCl in 100 mL of water. What is the concentration of Cl- ions in the solution?
A. 0.1 M
Correct B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: B

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Question 10
A 5 kg block is moving at a speed of 2 m/s on a horizontal surface. If the block is brought to rest in 2 seconds, what is the average force applied to the block?
A. 10 N
B. 20 N
Correct C. 30 N
D. 40 N

Correct Answer: C

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Question 11
In the context of cellular respiration, what is the primary function of the electron transport chain?
Correct A. To generate ATP from ADP and Pi
B. To produce NADH and FADH2
C. To reduce oxygen to water
D. To produce ATP from glu\cose

Correct Answer: A

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Question 12
A plant cell is placed in a solution containing 0.1 M glu\cose. If the cell membrane is permeable to glu\cose, what will happen to the concentration of glu\cose inside the cell?
A. The concentration of glu\cose will increase
Correct B. The concentration of glu\cose will decrease
C. The concentration of glu\cose will remain the same
D. The concentration of glu\cose will increase and then decrease

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 'X'?
A. To store water and nutrients
B. To produce ATP through cellular respiration
C. To synthesize proteins
Correct D. To regulate the cell's pH

Correct Answer: D

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Question 14
A diagram of a human respiratory system is shown below. What is the primary function of the structure labeled 'Y'?
Correct A. To exchange oxygen and carbon dioxide
B. To produce mucus
C. To regulate the body's temperature
D. To filter the blood

Correct Answer: A

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Question 15
A diagram of a human digestive system is shown below. What is the primary function of the structure labeled 'Z'?
A. To break down carbohydrates into simple sugars
B. To produce digestive enzymes
C. To regulate the body's pH
Correct D. To absorb nutrients into the bloodstream

Correct Answer: D

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Question 16
In a human body, the epithelial tissue is primarily responsible for forming the lining of the respiratory, gastrointestinal, and genitourinary tracts. Which of the following types of epithelial tissue is most likely to be found in the lining of the respiratory tract?
A. Simple Cuboidal Epithelium
B. Stratified Squamous Epithelium
Correct C. Pseudostratified Columnar Epithelium
D. Simple Columnar Epithelium

Correct Answer: C

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Question 17
A population of bacteria is growing in a culture medium. The initial population size is 100 bacteria, and the population doubles every 2 hours. If the population size at time t is denoted by P(t), which of the following equations represents the population growth of the bacteria?
A. (P(t) = 100 cdot 2^t)
Correct B. (P(t) = 100 cdot 2^{t/2})
C. (P(t) = 100 cdot 2^{t/4})
D. (P(t) = 100 cdot 2^{t/8})

Correct Answer: B

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Question 18
A diagram of the human brain is shown below. Which of the following structures is responsible for controlling voluntary movements?
Correct A. Cerebrum
B. Cerebellum
C. Brainstem
D. Spinal Cord

Correct Answer: A

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Question 19
A plant cell is shown below. Which of the following organelles is responsible for photosynthesis?
A. Mitochondria
Correct B. Chloroplast
C. Nucleus
D. Vacuole

Correct Answer: B

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Question 20
A diagram of the human eye is shown below. Which of the following structures is responsible for detecting light?
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 21
In a typical xylem vessel, what is the primary function of the lignin-rich secondary cell wall?
Correct A. To provide structural support to the vessel
B. To facilitate the transport of water and minerals
C. To regulate the rate of water flow
D. To store water and nutrients

Correct Answer: A

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

Correct Answer: B

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Question 23
The process of excretion in animals involves the removal of waste products from the body through the
A. Skin
B. Lungs
Correct C. Kidneys
D. Liver

Correct Answer: C

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Question 24
The diagram below shows a cross-section of a plant root. What is the function of the region labeled 'A'?
Correct A. To absorb water and minerals from the soil
B. To store food and nutrients
C. To produce hormones and growth regulators
D. To support the plant's structure

Correct Answer: A

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Question 25
In the e\cosystem shown below, what is the primary role of the decomposers?
A. To produce organic compounds from inorganic subs\tances
Correct B. To break down dead organisms and recycle nutrients
C. To produce energy from sunlight
D. To store energy in the form of ATP

Correct Answer: B

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