POST UTME NOUN 2020 Biology | Objective

Are you preparing for POST UTME NOUN 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 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. 0.84

Correct Answer: B

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Question 2
A plant cell has a cell wall composed of cellulose, hemicellulose, and pectin. Which of the following is NOT a component of the cell wall?
A. cellulose
B. hemicellulose
C. pectin
Correct D. lipid bilayer

Correct Answer: D

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Question 3
A 2.5-liter solution contains 1.5 moles of glu\cose. What is the molarity of the solution?
Correct A. 0.6 M
B. 0.8 M
C. 1.2 M
D. 1.5 M

Correct Answer: A

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Question 4
A 5.0-gram sample of a compound is found to have a mass of 2.5 grams after being burned in air. If the oxygen consumed is 1.0 gram, what is the empirical formula of the compound?
Correct A. CH4
B. CO2
C. H2O
D. C6H12O6

Correct Answer: A

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Question 5
A solution contains 0.5 moles of sodium chloride (NaCl) in 2.0 liters of water. What is the concentration of the solution in terms of molarity?
A. 0.25 M
Correct B. 0.5 M
C. 1.0 M
D. 2.0 M

Correct Answer: B

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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 size is 1000, what is the expected number of homozygous recessive individuals?
Correct A. 180
B. 200
C. 220
D. 240

Correct Answer: A

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Question 7
A species of bird has a wing span of 1.5 meters. If the bird is flying at a speed of 50 km/h, what is the angular velocity of the bird's wing?
A. 10 rad/s
Correct B. 20 rad/s
C. 30 rad/s
D. 40 rad/s

Correct Answer: B

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Question 8
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth rate of the bacteria at different pH levels and plots the data on a graph. What type of graph would the researcher most likely use?
A. Bar graph
Correct B. Line graph
C. Scatter plot
D. Histogram

Correct Answer: B

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Question 9
A species of plant has a photosynthetic rate of 10 mg CO2/h. If the plant is exposed to light for 8 hours, how much CO2 is absorbed by the plant?
A. 80 mg
Correct B. 100 mg
C. 120 mg
D. 140 mg

Correct Answer: B

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Question 10
A researcher is studying the effect of temperature on the growth of a microorganism. The researcher measures the growth rate of the microorganism at different temperatures and plots the data on a graph. What type of graph would the researcher most likely use?
A. Bar graph
Correct B. Line graph
C. Scatter plot
D. Histogram

Correct Answer: B

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Question 11
In a forest e\cosystem, the presence of a keystone species can have a cascading effect on the entire food chain. Which of the following species is most likely to be a keystone species?
A. Lion
B. Giraffe
Correct C. Elephant
D. Hyena

Correct Answer: C

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Question 12
A cell is placed in a solution with a high concentration of sugar. What will happen to the cell?
A. The cell will shrink due to water loss.
Correct B. The cell will swell due to water gain.
C. The cell will remain unchanged.
D. The cell will burst due to osmotic pressure.

Correct Answer: B

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Question 13
A population of rabbits is introduced to an island with no natural predators. Which of the following will happen to the population?
A. The population will remain cons\tant.
B. The population will decrease due to lack of resources.
Correct C. The population will increase exponentially.
D. The population will stabilize at a carrying capacity.

Correct Answer: C

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Question 14
A genetic trait is inherited in an autosomal dominant pattern. What is the probability that a child will inherit the trait if one parent is affected and the other parent is not?
A. 25%
Correct B. 50%
C. 75%
D. 100%

Correct Answer: B

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Question 15
A plant is placed in a solution with a high concentration of salt. What will happen to the plant?
A. The plant will grow faster due to increased water uptake.
Correct B. The plant will grow slower due to decreased water uptake.
C. The plant will remain unchanged.
D. The plant will die due to salt toxicity.

Correct Answer: B

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Question 16
The process of gas exchange in the lungs is primarily facilitated by the movement of which of the following?
A. Oxygen
Correct B. Carbon dioxide
C. Nitrogen
D. Water vapor

Correct Answer: B

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Question 17
The diagram below represents a cross-section of a plant root. Which of the following structures is responsible for the absorption of water and minerals from the soil?
A. A
Correct B. B
C. C
D. D

Correct Answer: B

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Question 18
The diagram below represents a simple e\cosystem. Which of the following organisms is a primary consumer?
A. A
Correct B. B
C. C
D. D

Correct Answer: B

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Question 19
The process of respiration in humans involves the breakdown of glu\cose to produce energy. Which of the following equations represents this process?
Correct A. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O \)
B. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O_2 \)
C. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2 \)
D. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O \)

Correct Answer: A

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Question 20
The diagram below represents a simple circuit. Which of the following components is responsible for the flow of electrons?
A. A
Correct B. B
C. C
D. D

Correct Answer: B

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Question 21
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 inner membrane
C. To produce NADH and FADH2
D. To reduce oxygen to water

Correct Answer: B

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Question 22
A cell is placed in a hypotonic solution. What happens to the cell?
A. The cell shrinks due to water loss
Correct B. The cell swells due to water uptake
C. The cell remains unchanged
D. The cell bursts due to osmotic pressure

Correct Answer: B

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Question 23
What is the primary function of the Golgi apparatus in a cell?
A. To synthesize proteins
Correct B. To modify and package proteins for secretion
C. To degrade proteins
D. To synthesize lipids

Correct Answer: B

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Question 24
A plant cell is placed in a solution with a high concentration of sucrose. What happens to the cell?
A. The cell shrinks due to water loss
Correct B. The cell swells due to water uptake
C. The cell remains unchanged
D. The cell bursts due to osmotic pressure

Correct Answer: B

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Question 25
What is the primary function of the mitochondria in a cell?
A. To synthesize proteins
Correct B. To generate ATP through substrate-level phosphorylation
C. To produce NADH and FADH2
D. To reduce oxygen to water

Correct Answer: B

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