POST UTME UNN 2021 Biology | Objective

Are you preparing for POST UTME UNN 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 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'?
Correct A. 0.16
B. 0.32
C. 0.36
D. 0.64

Correct Answer: A

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Question 2
A 2.5-metre tall man is s\tanding 15 metres away from a 5-metre tall lamppost. How far is the top of the lamppost from the man's eye level?
A. 1.5
B. 2.5
Correct C. 3.5
D. 4.5

Correct Answer: C

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Question 3
The diagram below shows a titration setup. If 25 cm^3 of 0.1 M NaOH is required to neutralize 25 cm^3 of HCl, what is the concentration of the HCl solution?
A. 0.05 M
Correct B. 0.1 M
C. 0.2 M
D. 0.5 M

Correct Answer: B

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Question 4
A population of bacteria doubles every 2 hours. If the initial population is 1000, what is the population after 6 hours?
A. 16000
B. 32000
Correct C. 64000
D. 128000

Correct Answer: C

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Question 5
A 10 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, what is its maximum speed?
A. 2 m/s
B. 4 m/s
Correct C. 6 m/s
D. 8 m/s

Correct Answer: C

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Question 6
In a population of 1000 bacteria, 80% are susceptible to a particular antibiotic. If 200 bacteria are exposed to the antibiotic, what is the expected number of resis\tant bacteria?
Correct A. 160
B. 240
C. 320
D. 400

Correct Answer: A

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Question 7
A diagram of a plant's xylem and phloem tissues is shown below. Which of the following is a function of the xylem?
Correct A. Transporting water and minerals from the roots to the leaves
B. Transporting sugars and other organic compounds from the leaves to the rest of the plant
C. Supporting the plant's structure
D. Regulating the plant's temperature

Correct Answer: A

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Question 8
A diagram of the human eye is shown below. Which of the following is a function of the retina?
A. Focu\sing light onto the retina
Correct B. Detecting light and converting it into electrical signals
C. Regulating the amount of light that enters the eye
D. Supporting the eye's structure

Correct Answer: B

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Question 9
A diagram of a cell's structure is shown below. Which of the following is a function of the mitochondria?
Correct A. Generating energy for the cell through cellular respiration
B. Regulating the cell's growth and division
C. Supporting the cell's structure
D. Detecting light and converting it into electrical signals

Correct Answer: A

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Question 10
A diagram of a plant's root system is shown below. Which of the following is a function of the root hairs?
Correct A. Absorbing water and minerals from the soil
B. Supporting the plant's structure
C. Regulating the plant's growth and development
D. Detecting light and converting it into electrical signals

Correct Answer: A

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Question 11
In the context of cell division, what is the primary function of the spindle fibers during anaphase?
Correct A. To attach to the kinetochore and pull sister chromatids apart
B. To form a cleavage furrow and separate the cytoplasm
C. To condense the chromosomes and prepare for metaphase
D. To repair damaged DNA during the cell cycle

Correct Answer: A

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Question 12
Which of the following biomes is characterized by a high level of rainfall and a dense, evergreen forest?
Correct A. Tropical rainforest
B. Temperate rainforest
C. Desert
D. Grassland

Correct Answer: A

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Question 13
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 14
In the context of cell structure, what is the primary function of the mitochondria?
A. To synthesize proteins
B. To store genetic information
Correct C. To generate energy for the cell
D. To regulate cell growth

Correct Answer: C

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Question 15
What is the process by which an organism's genetic information is passed from one generation to the next?
Correct A. Heritability
B. Mutation
C. Genetic drift
D. Natural selection

Correct Answer: A

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Question 16
In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'BB'?
Correct A. 0.36
B. 0.64
C. 0.72
D. 0.84

Correct Answer: A

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Question 17
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'rr'?
Correct A. 0.25
B. 0.5
C. 0.75
D. 0.9

Correct Answer: A

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Question 18
A solution of glu\cose (C6H12O6) is placed in a beaker and left to s\tand for several days. What is the expected outcome?
Correct A. The glu\cose will decompose into carbon dioxide and water.
B. The glu\cose will react with the air to form a brown precipitate.
C. The glu\cose will remain unchanged.
D. The glu\cose will dissolve in the beaker.

Correct Answer: A

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Question 19
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will have the genotype 'TT'?
A. 0.25
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

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Question 20
A solution of sodium hydroxide (NaOH) is placed in a beaker and left to s\tand for several days. What is the expected outcome?
A. The sodium hydroxide will decompose into sodium and oxygen.
B. The sodium hydroxide will react with the air to form a brown precipitate.
Correct C. The sodium hydroxide will remain unchanged.
D. The sodium hydroxide will dissolve in the beaker.

Correct Answer: C

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Question 21
In a forest e\cosystem, the primary producers are plants that undergo photosynthesis to produce glu\cose and oxygen. Which of the following is a byproduct of the light-dep\endent reactions in photosynthesis?
A. ATP
B. NADPH
Correct C. Oxygen
D. Glu\cose

Correct Answer: C

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Question 22
The diagram below shows a cross-section of the human eye. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 23
The classification of living things is based on the following characteristics. Which of the following is a characteristic of the domain Archaea?
A. Cell wall
B. Chloroplasts
Correct C. No true nucleus
D. Mitochondria

Correct Answer: C

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Question 24
The human body is composed of various systems that work together to maintain homeostasis. Which of the following systems is responsible for regulating body temperature?
A. Nervous system
B. Circulatory system
C. Respiratory system
Correct D. Integumentary system

Correct Answer: D

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Question 25
The diagram below shows a simple food chain. Which of the following is a producer in the food chain?
A. Herbivore
B. Carnivore
C. Decomposer
Correct D. Plant

Correct Answer: D

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