POST UTME SKYLINE UNIVERSITY 2023 Biology | Objective

Are you preparing for POST UTME SKYLINE UNIVERSITY 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
The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?
Correct A. Random mating
B. No mutation
C. No gene flow
D. No natural selection

Correct Answer: A

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Question 2
In the process of photosynthesis, which of the following is the primary function of the thylakoid membrane?
A. Light-dep\endent reactions
B. Light-indep\endent reactions
Correct C. Electron transport chain
D. ATP synthesis

Correct Answer: C

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Question 3
The hormone insulin plays a crucial role in regulating blood glu\cose levels. Which of the following is a direct effect of insulin on glu\cose metabolism?
A. Increased glu\cose uptake in muscles
B. Increased glu\cose release from liver
C. Increased gluconeogenesis
Correct D. Increased glycogen synthesis

Correct Answer: D

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Question 4
The process of excretion involves the removal of waste products from the body. Which of the following is a primary function of the kidneys in the excretory system?
Correct A. Filtering waste from blood
B. Regulating blood pressure
C. Maintaining electrolyte balance
D. Producing hormones

Correct Answer: A

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Question 5
The concept of homeostasis refers to the ability of the body to maintain a stable internal environment despite changes in external conditions. Which of the following is an example of a homeostatic mechanism?
Correct A. Thermoregulation
B. Osmoregulation
C. Electrolyte balance
D. Blood pressure regulation

Correct Answer: A

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Question 6
The process of osmoregulation in animals involves the regulation of water and electrolyte balance across cell membranes. Which of the following is a key mechanism involved in this process?
Correct A. Active transport of ions across cell membranes
B. Passive diffusion of water molecules across cell membranes
C. Excretion of excess water through the kidneys
D. Ingestion of electrolyte-rich foods

Correct Answer: A

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Question 7
A researcher is studying the classification of living organisms u\sing the Linnaean system. Which of the following is a characteristic of the kingdom Animalia?
A. Multicellular organisms with cell walls
Correct B. Multicellular organisms without cell walls
C. Cellular organisms with cell walls
D. Cellular organisms without cell walls

Correct Answer: B

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Question 8
A patient is diagnosed with a bacterial infection. Which of the following is a characteristic of the bacterial cell wall?
Correct A. Presence of a peptidoglycan layer
B. Presence of a polysaccharide layer
C. Presence of a protein layer
D. Absence of a cell wall

Correct Answer: A

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Question 9
A researcher is studying the growth and development of plants. Which of the following is a characteristic of the root system?
Correct A. Primary root is the main root of the plant
B. Secondary roots are smaller than primary roots
C. Root hairs are present on the surface of the root
D. Roots are absent in plants

Correct Answer: A

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Question 10
A patient is diagnosed with a kidney disease. Which of the following is a characteristic of the nephron?
Correct A. Presence of a glomerulus
B. Presence of a proximal convoluted tubule
C. Presence of a distal convoluted tubule
D. Absence of a nephron

Correct Answer: A

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Question 11
In a tropical rainforest e\cosystem, what is the primary role of the decomposer population in the nutrient cycle?
Correct A. To break down organic matter into simpler compounds
B. To synthesize complex organic compounds from inorganic nutrients
C. To regulate the population dynamics of other organisms
D. To produce antibiotics that inhibit the growth of other microorganisms

Correct Answer: A

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Question 12
A patient is diagnosed with a bacterial infection caused by Escherichia coli (E. coli). Which of the following antibiotics is most likely to be effective against this infection?
A. Penicillin
B. Amoxicillin
Correct C. Ciprofloxacin
D. Vancomycin

Correct Answer: C

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Question 13
In a human nervous system, what is the primary function of the myelin sheath surrounding the axon of a neuron?
Correct A. To transmit electrical signals along the axon
B. To provide structural support to the neuron
C. To regulate the release of neurotransmitters
D. To facilitate the repair of damaged neurons

Correct Answer: A

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Question 14
A plant tissue culture experiment involves the use of a nutrient medium to promote the growth of plant cells. What is the primary component of this medium that facilitates cell division?
A. Auxins
Correct B. Cytokinins
C. Ethylene
D. Abscisic acid

Correct Answer: B

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Question 15
A human reproductive system involves the fusion of a sperm cell with an egg cell to form a zygote. What is the primary mechanism by which the sperm cell penetrates the egg cell?
Correct A. Acrosome reaction
B. Zona pellucida binding
C. Sperm-egg fusion
D. Cortical reaction

Correct Answer: A

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Question 16
In the process of cellular respiration, what is the primary function of the electron transport chain?
A. To produce NADH and FADH2
Correct B. To generate ATP molecules
C. To synthesize glu\cose
D. To break down proteins

Correct Answer: B

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Question 17
A plant's xylem tissue is responsible for transporting what subs\tance?
A. Water and sugars
Correct B. Water and minerals
C. Sugars and amino acids
D. Proteins and lipids

Correct Answer: B

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Question 18
The human eye's retina contains specialized cells called rods and cones. What is the primary function of these cells?
A. To produce tears
Correct B. To detect light and color
C. To regulate pupil size
D. To focus images

Correct Answer: B

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Question 19
In the classification of living things, what is the primary characteristic used to distinguish between prokaryotic and eukaryotic cells?
A. Presence of a cell wall
Correct B. Presence of a true nucleus
C. Presence of mitochondria
D. Presence of chloroplasts

Correct Answer: B

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Question 20
In the process of mitosis, what is the primary function of the anaphase stage?
A. To condense chromosomes
Correct B. To separate sister chromatids
C. To form a spindle apparatus
D. To decondense chromosomes

Correct Answer: B

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Question 21
In the context of hormonal coordination, what is the primary function of the hypothalamus?
A. Regulation of body temperature
B. Regulation of hunger and thirst
Correct C. Regulation of hormone secretion
D. Regulation of sleep and wakefulness

Correct Answer: C

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Question 22
A cell is placed in a solution with a high concentration of glu\cose. Which of the following best describes the movement of water into the cell?
Correct A. Osmosis
B. Diffusion
C. Active transport
D. Passive transport

Correct Answer: A

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Question 23
In the context of sense organs, what is the primary function of the retina?
Correct A. To detect light and color
B. To detect sound and vibrations
C. To detect touch and pressure
D. To detect taste and smell

Correct Answer: A

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Question 24
A plant is placed in a greenhouse with a controlled temperature and humidity. Which of the following best describes the process of photosynthesis in this environment?
A. Light-dep\endent reactions
Correct B. Light-indep\endent reactions
C. Calvin cycle
D. Electron transport chain

Correct Answer: B

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Question 25
A person is diagnosed with a hormonal imbalance. Which of the following best describes the role of the pituitary gland in this condition?
Correct A. To regulate hormone secretion
B. To regulate body temperature
C. To regulate hunger and thirst
D. To regulate sleep and wakefulness

Correct Answer: A

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