POST UTME BABCOCK UNIVERSITY 2025 Biology | Objective

Are you preparing for POST UTME BABCOCK UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2025 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
The process of osmoregulation in animals involves the regulation of water and salt balance in the body. Which of the following is a key mechanism used by the kidneys to excrete excess salt?
Correct A. Active transport of sodium ions
B. Passive diffusion of water molecules
C. Filtration of blood plasma
D. Secretion of antidiuretic hormone

Correct Answer: A

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Question 2
In the context of evolutionary theory, what is the term for the process by which a new species emerges from an existing one?
Correct A. Speciation
B. Adaptation
C. Mutation
D. Genetic drift

Correct Answer: A

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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

Correct Answer: B

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Question 4
In the context of respiration, what is the term for the process by which glu\cose is converted into energy in the presence of oxygen?
A. Glycolysis
B. Citric acid cycle
C. Electron transport chain
Correct D. Aerobic respiration

Correct Answer: D

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Question 5
A diagram of a human eye is shown below. What is the function of the structure labeled 'B'?
Correct A. To focus light on the retina
B. To regulate pupil size
C. To detect color
D. To produce tears

Correct Answer: A

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Question 6
A study on the genetic variation of a population found that the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'A'?
Correct A. 0.8
B. 0.6
C. 0.4
D. 0.2

Correct Answer: A

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Question 7
A diagram of the human body shows the following organs: heart, lungs, liver, stomach, and kidneys. Which of the following systems does NOT belong to the circulatory system?
A. liver
B. lungs
Correct C. stomach
D. kidneys

Correct Answer: C

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Question 8
A plant has a root system that consists of a taproot and a network of smaller roots. Which of the following types of roots is responsible for absorbing water and minerals from the soil?
A. taproot
Correct B. smaller roots
C. both
D. neither

Correct Answer: B

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Question 9
A diagram of the human circulatory system shows the following components: heart, arteries, veins, and capillaries. Which of the following is the primary function of the capillaries?
A. transporting oxygen to the body
B. transporting carbon dioxide from the body
C. regulating blood pressure
Correct D. exchanging oxygen and carbon dioxide with the body

Correct Answer: D

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Question 10
A study on the growth of a population found that the population size increased by 20% in the first year and by 15% in the second year. What is the total percentage increase in population size over the two-year period?
A. 35%
B. 40%
Correct C. 45%
D. 50%

Correct Answer: C

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Question 11
In the context of osmoregulation, what is the primary function of the kidneys in maintaining electrolyte balance?
A. To regulate blood pH levels
Correct B. To maintain electrolyte balance
C. To regulate water balance
D. To regulate blood pressure

Correct Answer: B

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Question 12
A diagram of the human eye is shown below. Identify the part labeled A.
Correct A. Cornea
B. Iris
C. Lens
D. Retina

Correct Answer: A

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Question 13
The graph below shows the relationship between the concentration of a solution and its osmotic pressure. What is the equation of the line of best fit?
Correct A. \( P = \frac{nRT}{V} \)
B. \( P = \frac{V}{nRT} \)
C. \( P = \frac{nRT}{V^2} \)
D. \( P = \frac{V^2}{nRT} \)

Correct Answer: A

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Question 14
A diagram of the human circulatory system is shown below. Identify the part labeled A.
Correct A. Aorta
B. Pulmonary artery
C. Coronary artery
D. Vein

Correct Answer: A

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Question 15
The equation of a curve is given by \( y = \frac{1}{x} \). What is the value of ( y ) when \( x = 2 \)?
Correct A. 0.5
B. 1
C. 2
D. 4

Correct Answer: A

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Question 16
The xylem tissue in plants is responsible for transporting water and minerals from the roots to the leaves. Which of the following statements about xylem tissue is correct?
Correct A. Xylem tissue is composed of dead cells.
B. Xylem tissue is responsible for transporting sugars and amino acids.
C. Xylem tissue is composed of living cells.
D. Xylem tissue is responsible for transporting water and minerals from the leaves to the roots.

Correct Answer: A

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Question 17
The nervous system is responsible for transmitting signals from the brain to the rest of the body. Which of the following structures is responsible for transmitting signals from the sensory receptors to the spinal cord?
Correct A. Dorsal root ganglion
B. Spinal cord
C. Cerebral cortex
D. Brainstem

Correct Answer: A

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Question 18
The blood vessels in the circulatory system are responsible for transporting blood throughout the body. Which of the following structures is responsible for regulating blood pressure?
A. Aorta
B. Pulmonary artery
C. Renal arteries
Correct D. Baroreceptors

Correct Answer: D

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Question 19
The sense organs in the human body are responsible for detecting stimuli from the environment. Which of the following sense organs is responsible for detecting light and color?
Correct A. Eye
B. Ear
C. Nose
D. Tongue

Correct Answer: A

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Question 20
The evolutionary theory of natural selection states that individuals with favorable traits are more likely to survive and reproduce. Which of the following is an example of a favorable trait?
A. Large body size
B. Strong immune system
Correct C. Ability to fly
D. Ability to swim

Correct Answer: C

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Question 21
In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' for black eyes is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'B'B'?
A. 0.36
Correct B. 0.64
C. 0.8
D. 0.92

Correct Answer: B

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Question 22
A 2.5-liter solution contains 1.8 moles of glu\cose (C6H12O6). What is the concentration of the glu\cose solution in g/L?
Correct A. 0.36
B. 0.64
C. 0.8
D. 0.92

Correct Answer: A

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Question 23
A bio\logist observes a population of rabbits in a forest. The population grows according to the \logistic growth model: dP/dt = rP\( 1-P/K \). If the initial population is 100, the carrying capacity is 1000, and the growth rate is 0.2, what is the population size after 5 years?
Correct A. 820.92
B. 850.92
C. 880.92
D. 910.92

Correct Answer: A

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Question 24
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
Correct A. Mitochondria
B. Chloroplast
C. Nucleus
D. Vacuole

Correct Answer: A

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Question 25
A 2.5-liter solution contains 1.8 moles of glu\cose (C6H12O6). What is the concentration of the glu\cose solution in g/L?
Correct A. 0.36
B. 0.64
C. 0.8
D. 0.92

Correct Answer: A

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