POST UTME SKYLINE UNIVERSITY 2020 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 2020 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 cellular respiration, what is the primary function of the mitochondria?
A. To synthesize ATP from glu\cose
B. To break down glu\cose into pyruvate
C. To produce NADH and FADH2
Correct D. To transport electrons in the electron transport chain

Correct Answer: D

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Question 2
A species of plant is found to have a diploid number of 14. What is the expected number of chromosomes in the gametes?
Correct A. 7
B. 14
C. 21
D. 28

Correct Answer: A

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

Correct Answer: A

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Question 4
A population of rabbits is growing at a rate of 20% per year. If the initial population is 100 rabbits, what will be the population after 5 years?
A. 1000
B. 5000
Correct C. 10000
D. 20000

Correct Answer: C

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Question 5
A diagram of a titration setup is shown below. What is the purpose of the burette?
Correct A. To measure the volume of the acid
B. To measure the volume of the base
C. To mix the acid and base
D. To measure the pH of the solution

Correct Answer: A

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Question 6
In a population of 1000 individuals, the frequency of the dominant allele is 0.6. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the recessive allele?
A. 0.3
Correct B. 0.4
C. 0.5
D. 0.6

Correct Answer: B

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Question 7
A cell in the G2 phase of the cell cycle has a DNA content of 8C. What is the stage of the cell cycle when the DNA content is 4C?
A. G1
B. G2
Correct C. S
D. M

Correct Answer: C

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Question 8
The xylem sap of a plant contains 0.5 M glu\cose and 0.2 M sucrose. What is the total osmotic pressure of the xylem sap?
A. 0.3
B. 0.5
Correct C. 0.7
D. 1.0

Correct Answer: C

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Question 9
A microorganism is placed in a medium containing 1% glu\cose and 0.5% peptone. What is the limiting factor for the growth of the microorganism?
A. Glu\cose
Correct B. Peptone
C. Both
D. Neither

Correct Answer: B

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Question 10
A plant has a root system with a radius of 10 cm and a height of 20 cm. What is the surface area of the root system?
A. 100
B. 200
Correct C. 314.16
D. 500

Correct Answer: C

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Question 11
In a typical terrestrial e\cosystem, what is the primary function of the xylem in plants?
Correct A. Transport of water and minerals from the roots to the leaves
B. Transport of sugars and amino acids from the leaves to the roots
C. Regulation of water potential in the plant
D. Production of ATP in the plant

Correct Answer: A

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Question 12
A 2.5-g sample of a subs\tance is dissolved in 25 mL of water. If the resulting solution has a concentration of 0.15 M, what is the molar mass of the subs\tance?
A. 10 g/mol
B. 20 g/mol
Correct C. 30 g/mol
D. 40 g/mol

Correct Answer: C

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Question 13
In a typical human cell, what is the primary function of the mitochondria?
Correct A. Production of ATP through cellular respiration
B. Regulation of cell growth and division
C. Transport of subs\tances across the cell membrane
D. Production of proteins through translation

Correct Answer: A

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Question 14
A population of rabbits is growing according to the \logistic growth model. If the initial population is 100 rabbits and the carrying capacity is 500 rabbits, what is the population after 5 years?
A. 200 rabbits
B. 300 rabbits
Correct C. 400 rabbits
D. 500 rabbits

Correct Answer: C

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Question 15
A 10-mL sample of a solution containing 0.5 M glu\cose is diluted to 50 mL. What is the concentration of the resulting solution?
A. 0.05 M
Correct B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: B

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Question 16
In the process of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
Correct B. To pump protons across the mitochondrial membrane, creating a proton gradient
C. To reduce NADH and FADH2 to NAD+ and FAD
D. To produce water and carbon dioxide as byproducts

Correct Answer: B

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Question 17
A patient is diagnosed with a rare genetic disorder that affects the production of melanin. Which of the following sense organs is most likely to be affected?
A. Eye
B. Ear
C. Nose
Correct D. Skin

Correct Answer: D

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Question 18
A 30-year-old athlete is experiencing shortness of breath and fatigue during exercise. Which of the following transport systems is most likely to be impaired?
A. Xylem
B. Phloem
Correct C. Blood
D. Lymphatic system

Correct Answer: C

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Question 19
A patient is experiencing kidney failure and is undergoing dialysis. Which of the following excretory organs is most likely to be affected?
A. Liver
Correct B. Kidneys
C. Lungs
D. Skin

Correct Answer: B

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Question 20
A 40-year-old patient is experiencing muscle weakness and fatigue. Which of the following tissue types is most likely to be affected?
A. Epithelial
B. Connective
Correct C. Muscle
D. Nervous

Correct Answer: C

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Question 21
In the context of evolutionary bio\logy, what is the primary mechanism driving the adaptation of populations to changing environments?
Correct A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation

Correct Answer: A

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Question 22
A cell undergoes mitosis, resulting in two daughter cells. What is the total number of chromosomes in the daughter cells?
Correct A. 2n
B. n
C. 2n + 1
D. n + 1

Correct Answer: A

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Question 23
In the human body, what is the primary function of the xylem tissue?
Correct A. Transport of oxygen and nutrients to the cells
B. Removal of waste products from the cells
C. Support and structure of the plant body
D. Production of hormones

Correct Answer: A

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Question 24
A population of birds is observed to have a mean height of 30 cm with a s\tandard deviation of 5 cm. What is the probability that a randomly selected bird will have a height greater than 35 cm?
Correct A. 0.05
B. 0.10
C. 0.15
D. 0.20

Correct Answer: A

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Question 25
In the context of cellular respiration, what is the primary function of the electron transport chain?
Correct A. Production of ATP
B. Production of NADH
C. Production of FADH2
D. Production of water

Correct Answer: A

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