POST UTME OAU 2020 Biology | Objective

Are you preparing for POST UTME OAU 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 context of photosynthesis, what is the role of the enzyme RuBisCO?
Correct A. It catalyzes the conversion of CO2 to glu\cose
B. It regulates the amount of ATP produced during photosynthesis
C. It is responsible for the light-dep\endent reactions
D. It is involved in the Calvin cycle

Correct Answer: A

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Question 2
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
Correct A. It is responsible for detecting light
B. It is involved in the regulation of pupil size
C. It is responsible for the accommodation of the eye
D. It is involved in the production of tears

Correct Answer: A

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Question 3
In the context of cell division, what is the role of the spindle fibers?
Correct A. They are responsible for the separation of chromosomes during anaphase
B. They are involved in the regulation of the cell cycle
C. They are responsible for the movement of the centrioles
D. They are involved in the production of the mitotic spindle

Correct Answer: A

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Question 4
A diagram of the human digestive system is shown below. What is the function of the part labeled 'B'?
A. It is responsible for the absorption of nutrients
B. It is involved in the regulation of blood sugar levels
Correct C. It is responsible for the digestion of proteins
D. It is involved in the production of digestive enzymes

Correct Answer: C

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Question 5
In the context of eco\logy, what is the term for the movement of organisms from one region to another?
A. Migration
B. Emigration
C. Immigration
Correct D. Dispersal

Correct Answer: D

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Question 6
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?
Correct A. 0.36
B. 0.64
C. 0.16
D. 0.84

Correct Answer: A

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Question 7
A diagram of a plant's root system is shown below. Which of the following structures is responsible for the absorption of water and minerals from the soil?
A. Stomata
B. Xylem
C. Phloem
Correct D. Root hairs

Correct Answer: D

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Question 8
A diagram of the human respiratory system is shown below. Which of the following structures is responsible for the exchange of oxygen and carbon dioxide?
A. Trachea
B. Bronchi
Correct C. Alveoli
D. Diaphragm

Correct Answer: C

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Question 9
A diagram of the human circulatory system is shown below. Which of the following structures is responsible for the transport of oxygenated blood from the lungs to the heart?
A. Pulmonary arteries
Correct B. Pulmonary veins
C. Left atrium
D. Right ventricle

Correct Answer: B

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Question 10
A diagram of the human nervous system is shown below. Which of the following structures is responsible for the transmission of nerve impulses from the sensory receptors to the central nervous system?
A. Sensory receptors
Correct B. Axon
C. D\endrite
D. Synapse

Correct Answer: B

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Question 11
In the context of evolutionary theories, 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 12
A plant's xylem tissue is responsible for transporting water and minerals from the roots to the leaves. What is the primary mechanism by which water is transported through the xylem?
Correct A. Transpiration Pull
B. Root Pressure
C. Capillary Action
D. Osmosis

Correct Answer: A

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Question 13
The excretory system in humans is responsible for removing waste products from the body. Which of the following organs plays a crucial role in the excretion of urea?
Correct A. Kidneys
B. Liver
C. Lungs
D. Skin

Correct Answer: A

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Question 14
The growth and development of an organism is regulated by a complex interplay of genetic and environmental factors. What is the primary mechanism by which cells in a developing organism communicate with each other?
Correct A. Hormones
B. Signaling Molecules
C. Cell-Cell Contact
D. Genetic Regulation

Correct Answer: A

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Question 15
The nervous system in humans is responsible for transmitting and proces\sing information. Which of the following types of neurons is responsible for transmitting sensory information from the periphery to the central nervous system?
A. Motor Neurons
Correct B. Sensory Neurons
C. Interneurons
D. Glial Cells

Correct Answer: B

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Question 16
In the xylem, water and minerals are transported from the roots to the leaves through the process of
Correct A. Transpiration Pull
B. Root Pressure
C. Transpiration Push
D. Capillary Action

Correct Answer: A

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Question 17
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of
Correct A. Glu\cose and Oxygen
B. Starch and Carbon Dioxide
C. Protein and Water
D. Fat and Nitrogen

Correct Answer: A

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Question 18
The excretory system in humans consists of the kidneys, ureters, bladder, and urethra, which work together to remove waste and excess fluids from the body through the process of
A. Osmoregulation
Correct B. Excretion
C. Respiration
D. Circulation

Correct Answer: B

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Question 19
The sense organ responsible for detecting changes in light intensity is the
Correct A. Eye
B. Ear
C. Nose
D. Tongue

Correct Answer: A

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Question 20
The process of digestion in the human body involves the breakdown of food into smaller molecules through the action of enzymes, which are produced by the
A. Salivary Glands
Correct B. Pancreas
C. Small Intestine
D. Liver

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 size is 1000, calculate the number of homozygous recessive individuals.
A. 20
Correct B. 40
C. 60
D. 80

Correct Answer: B

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Question 22
The diagram below represents a cross between two true-breeding lines of Drosophila melanogaster. What is the probability that a progeny will be homozygous dominant?
A. 0.25
B. 0.5
C. 0.75
Correct D. 1

Correct Answer: D

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Question 23
The following graph represents the relationship between the concentration of a substrate and the rate of enzyme activity. What is the order of the reaction?
A. First order
B. Second order
Correct C. Zero order
D. Third order

Correct Answer: C

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Question 24
The following diagram represents a cross between two true-breeding lines of Drosophila melanogaster. What is the probability that a progeny will be homozygous recessive?
Correct A. 0.25
B. 0.5
C. 0.75
D. 1

Correct Answer: A

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Question 25
The following graph represents the relationship between the concentration of a substrate and the rate of enzyme activity. What is the order of the reaction?
A. First order
Correct B. Second order
C. Zero order
D. Third order

Correct Answer: B

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