POST UTME AFE BABALOLA UNIVERSITY 2024 Biology | Objective

Are you preparing for POST UTME AFE BABALOLA UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2024 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In a desert e\cosystem, what is the primary mechanism by which plants regulate water loss through their leaves?
Correct A. Transpiration
B. Respiration
C. Photosynthesis
D. Osmosis

Correct Answer: A

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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 no effect on enzyme activity
B. pH increases enzyme activity
Correct C. pH decreases enzyme activity
D. pH has a biphasic effect on enzyme activity

Correct Answer: C

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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. Mitochondria
B. Chloroplast
Correct C. Nucleus
D. Vacuole

Correct Answer: C

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Question 4
A population of rabbits is growing according to the \logistic growth model. What is the carrying capacity of the population?
A. 10
Correct B. 20
C. 30
D. 40

Correct Answer: B

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Question 5
A diagram of a simple harmonic motion is shown below. What is the amplitude of the motion?
A. 2
Correct B. 4
C. 6
D. 8

Correct Answer: B

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Question 6
The process of evolution by natural selection can be described by the following equation: \( Delta W = \frac{dW}{dt} \). What does this equation represent?
Correct A. The rate of change of fitness with respect to time
B. The rate of change of population size with respect to time
C. The rate of change of genetic variation with respect to time
D. The rate of change of environmental conditions with respect to time

Correct Answer: A

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Question 7
In the context of cell division, what is the primary function of the spindle fibers?
Correct A. To separate chromosomes during anaphase
B. To align chromosomes during prophase
C. To form the nuclear envelope during telophase
D. To condense chromosomes during prophase

Correct Answer: A

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Question 8
The following graph represents the growth of a population over time. What is the carrying capacity of the population?
A. 100
B. 200
Correct C. 300
D. 400

Correct Answer: C

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Question 9
The following equation represents the rate of diffusion of a subs\tance across a membrane: \( \frac{dC}{dt} = \frac{D cdot A cdot \( C_0 - C \ \)}{x} ). What is the unit of the cons\tant D?
Correct A. m^2/s
B. m/s
C. s^-1
D. m^3/s

Correct Answer: A

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Question 10
The following diagram represents a cross-section of a plant root. What is the function of the xylem tissue?
Correct A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the roots
C. To provide structural support to the plant
D. To regulate the plant's water balance

Correct Answer: A

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Question 11
A diagram of the human respiratory system is shown below. Identify the part labeled 'A' in the diagram.
A. Trachea
Correct B. Lungs
C. Diaphragm
D. Bronchi

Correct Answer: B

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Question 12
The diagram below represents a titration setup. Identify the subs\tance being titrated.
A. Acid
Correct B. Base
C. Solvent
D. Solute

Correct Answer: B

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Question 13
The following diagram represents a cross-section of the human eye. Identify the part labeled 'D' in the diagram.
A. Cornea
B. Iris
C. Retina
Correct D. Lens

Correct Answer: D

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Question 14
The following diagram represents a phy\logenetic tree. Identify the common ancestor of species A and B.
A. Species A
B. Species B
Correct C. Common Ancestor
D. Species C

Correct Answer: C

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Question 15
The following diagram represents a cross-section of a plant root. Identify the part labeled 'E' in the diagram.
A. Epidermis
B. Cortex
C. Endodermis
D. Stele
Correct E. Xylem

Correct Answer: E

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Question 16
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'R'?
Correct A. 0.8
B. 0.6
C. 0.4
D. 0.2

Correct Answer: A

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Question 17
A 2.5 cm long root hair cell has a surface area of 0.05 cm^2. If the root hair cell is 10 times longer than it is wide, what is its width?
A. 0.005 cm
Correct B. 0.01 cm
C. 0.02 cm
D. 0.05 cm

Correct Answer: B

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Question 18
A diagram of a plant's xylem is shown below. What is the function of the xylem in the plant?
Correct A. Transport of water and minerals from the roots to the leaves
B. Transport of sugars from the leaves to the roots
C. Transport of oxygen from the roots to the leaves
D. Transport of carbon dioxide from the leaves to the roots

Correct Answer: A

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Question 19
A population of 1000 rabbits is introduced to a new island. The population grows at a rate of 20% per year. What is the population size after 5 years?
Correct A. 1638
B. 2000
C. 2500
D. 3000

Correct Answer: A

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Question 20
A 5 cm long stem has a diameter of 0.5 cm. If the stem is 10 times longer than it is wide, what is its width?
A. 0.05 cm
Correct B. 0.1 cm
C. 0.2 cm
D. 0.5 cm

Correct Answer: B

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Question 21
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?
A. 0.36
Correct B. 0.64
C. 0.72
D. 0.80

Correct Answer: B

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Question 22
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will have the genotype 'TT'?
Correct A. 0.25
B. 0.50
C. 0.75
D. 1.00

Correct Answer: A

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Question 23
A cell is placed in a medium with a pH of 7.4. If the cell has a membrane potential of -70 mV, what is the concentration of hydrogen ions outside the cell?
A. 10^{-7.4}
B. 10^{-70}
C. 10^{-7.4} \times 10^{-70}
Correct D. 10^{-7.4} \div 10^{-70}

Correct Answer: D

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Question 24
A nerve cell is stimulated by an action potential. What is the sequence of events that occurs in the cell?
Correct A. depolarization, repolarization, hyperpolarization
B. repolarization, depolarization, hyperpolarization
C. hyperpolarization, depolarization, repolarization
D. depolarization, hyperpolarization, repolarization

Correct Answer: A

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Question 25
A kidney stone is formed in the kidney. What is the most likely cause of the stone?
Correct A. excess calcium in the urine
B. excess oxalate in the urine
C. excess uric acid in the urine
D. excess sodium in the urine

Correct Answer: A

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