POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2021 Biology | Objective

Are you preparing for POST UTME JOSEPH AYO BABALOLA UNIVERSITY 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
In the process of osmoregulation, what is the primary mechanism by which the kidneys regulate the concentration of ions in the blood?
A. Hormonal regulation
Correct B. Renal tubular reabsorption
C. Glomerular filtration
D. Hemodialysis

Correct Answer: B

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Question 2
A 25-year-old male patient is diagnosed with a pituitary tumor that is secreting excess growth hormone. Which of the following symptoms is most likely to occur?
Correct A. Acromegaly
B. Cushing's syndrome
C. Hyperthyroidism
D. Hypothyroidism

Correct Answer: A

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Question 3
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 detect movement
C. To regulate pupil size
D. To produce tears

Correct Answer: A

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Question 4
A 30-year-old female patient is diagnosed with a genetic disorder that affects her ability to synthesize melanin. Which of the following symptoms is most likely to occur?
Correct A. Albinism
B. Vitiligo
C. Melasma
D. Erythema

Correct Answer: A

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Question 5
A diagram of the human nervous system is shown below. What is the function of the part labeled 'B'?
A. To transmit sensory information
B. To regulate body temperature
Correct C. To control voluntary movements
D. To produce hormones

Correct Answer: C

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Question 6
In the xylem, what is the primary function of the tracheids?
Correct A. Transport of water and minerals from roots to leaves
B. Production of ethylene gas for plant growth
C. Storage of starch and other nutrients
D. Regulation of stomatal opening and clo\sing

Correct Answer: A

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Question 7
What is the primary mechanism of gas exchange in plants?
Correct A. Diffusion through the cell membrane
B. Active transport across the stomata
C. Passive transport through the xylem
D. Osmosis through the cuticle

Correct Answer: A

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Question 8
Which of the following is an example of a biome?
A. A coral reef
B. A desert e\cosystem
Correct C. A tropical rainforest
D. A freshwater lake

Correct Answer: C

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Question 9
What is the primary function of the hypothalamus in the regulation of body temperature?
A. To increase body temperature
B. To decrease body temperature
Correct C. To maintain a stable body temperature
D. To regulate circadian rhythms

Correct Answer: C

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Question 10
What is the process by which plants convert light energy into chemical energy?
Correct A. Photosynthesis
B. Respiration
C. Transpiration
D. Osmosis

Correct Answer: A

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Question 11
In the context of evolutionary theory, what is the primary mechanism by which genetic drift can lead to the fixation of a deleterious mutation?
A. Natural selection
B. Genetic hitchhiking
Correct C. Genetic drift
D. Gene flow

Correct Answer: C

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Question 12
A plant cell is placed in a solution with a high concentration of sucrose. What is the expected change in the cell's turgor pressure?
Correct A. Increase
B. Decrease
C. No change
D. Variable

Correct Answer: A

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Question 13
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 0.2 per hour, what is the population size after 5 hours?
A. 1000
Correct B. 2000
C. 5000
D. 10000

Correct Answer: B

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Question 14
A neuron is stimulated by an action potential. What is the expected change in the neuron's membrane potential?
Correct A. Depolarization
B. Hyperpolarization
C. No change
D. Variable

Correct Answer: A

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Question 15
A gene is located on the X chromosome. What is the expected effect on the gene's expression if a mutation occurs in the gene?
A. Increased expression
Correct B. Decreased expression
C. No change
D. Variable

Correct Answer: B

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Question 16
In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope. What is the name of the stage during which the nuclear envelope breaks down?
Correct A. Prophase
B. Metaphase
C. Anaphase
D. Telophase

Correct Answer: A

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Question 17
The diagram below shows the structure of a plant cell. What is the function of the cell wall?
Correct A. Provides structural support
B. Regulates the movement of materials in and out of the cell
C. Produces energy for the cell
D. Stores genetic information

Correct Answer: A

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Question 18
In a population of rabbits, the frequency of the dominant allele for brown fur is 0.6, and the frequency of the recessive allele for black fur is 0.4. What is the expected frequency of the heterozygous genotype?
A. 0.2
Correct B. 0.4
C. 0.6
D. 0.8

Correct Answer: B

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Question 19
The diagram below shows the water cycle. What is the process called when water evaporates from the surface of the ocean and forms clouds?
Correct A. Evaporation
B. Condensation
C. Precipitation
D. Runoff

Correct Answer: A

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Question 20
In a e\cosystem, the population of a species is limited by the availability of food. What is the term for this type of limitation?
A. Competition
B. Predation
C. Mutualism
Correct D. Resource limitation

Correct Answer: D

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Question 21
The process of meiosis in a diploid cell results in the production of four haploid daughter cells. What is the primary function of the synaptonemal complex in meiosis?
A. To facilitate the exchange of genetic material between homo\logous chromosomes
B. To ensure the accurate separation of sister chromatids during anaphase I
C. To regulate the progression of meiosis from prophase I to metaphase I
Correct D. To promote the formation of chiasmata between non-sister chromatids

Correct Answer: D

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Question 22
A researcher is studying the evolution of a particular species of bird. Which of the following is an example of a convergent evolution?
Correct A. The development of wings in birds and insects
B. The evolution of the eye in different species
C. The adaptation of the human nose to breathe in cold climates
D. The development of the human brain to process complex information

Correct Answer: A

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Question 23
A bio\logist is studying the structure of a plant cell. What is the primary function of the cell wall in plant cells?
Correct A. To provide structural support to the cell
B. To regulate the movement of materials in and out of the cell
C. To facilitate the exchange of gases between the cell and the environment
D. To store nutrients and water within the cell

Correct Answer: A

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Question 24
A researcher is studying the impact of climate change on e\cosystems. Which of the following is an example of a biotic factor that affects the distribution of species?
A. Temperature
B. Humidity
C. Predation
Correct D. Competition for resources

Correct Answer: D

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Question 25
A bio\logist is studying the structure of a prokaryotic cell. What is the primary function of the cell membrane in prokaryotic cells?
Correct A. To regulate the movement of materials in and out of the cell
B. To provide structural support to the cell
C. To facilitate the exchange of gases between the cell and the environment
D. To store nutrients and water within the cell

Correct Answer: A

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