POST UTME BELLS UNIVERSITY 2021 Biology | Objective

Are you preparing for POST UTME BELLS UNIVERSITY 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 'r' 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 2
A plant cell has a vacuole that contains 0.5 M sucrose solution. If the cell membrane is permeable to water but not to sucrose, what will happen to the cell?
A. The cell will shrink.
Correct B. The cell will swell.
C. The cell will remain unchanged.
D. The cell will burst.

Correct Answer: B

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Question 3
A species of bird has a beak length of 5 cm. If the beak length is directly proportional to the square root of the bird's body weight, and the bird's body weight is 100 g, what is the beak length?
A. 2.5 cm
Correct B. 5 cm
C. 7.5 cm
D. 10 cm

Correct Answer: B

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Question 4
A population of rabbits is growing at a rate of 20% per year. If the initial population size is 100, what will be the population size after 3 years?
A. 324
B. 360
C. 400
Correct D. 450

Correct Answer: D

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Question 5
A plant has a root system that absorbs water and nutrients from the soil. If the plant is placed in a solution with a concentration of 0.5 M sucrose, what will happen to the plant?
A. The plant will grow faster.
Correct B. The plant will grow slower.
C. The plant will remain unchanged.
D. The plant will die.

Correct Answer: B

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Question 6
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 generate ATP through oxidative phosphorylation
C. To generate NADH and FADH2
D. To generate ATP through glycolysis

Correct Answer: B

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Question 7
What is the term for the movement of water from a region of high concentration to a region of low concentration across a semipermeable membrane?
Correct A. Osmosis
B. Diffusion
C. Active transport
D. Passive transport

Correct Answer: A

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Question 8
In a eukaryotic cell, what is the primary function of the Golgi apparatus?
A. To synthesize proteins
B. To synthesize lipids
Correct C. To modify and package proteins and lipids for transport
D. To synthesize carbohydrates

Correct Answer: C

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Question 9
What is the term for the process by which bacteria become resis\tant to antibiotics?
A. Mutation
B. Gene expression
Correct C. Horizontal gene transfer
D. Antibiotic resis\tance

Correct Answer: C

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Question 10
In the process of photosynthesis, what is the primary function of the light-dep\endent reactions?
Correct A. To generate ATP and NADPH
B. To generate glu\cose and oxygen
C. To generate ATP and oxygen
D. To generate NADPH and glu\cose

Correct Answer: A

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Question 11
The structure of the human eye is adapted to focus light onto the retina. Which part of the eye is responsible for changing the shape of the lens to achieve this focus?
A. Cornea
B. Iris
Correct C. Ciliary muscles
D. Retina

Correct Answer: C

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Question 12
The xylem tissue in plants is responsible for transporting water and minerals from the roots to the leaves. Which of the following is a characteristic of xylem tissue?
Correct A. It is composed of dead cells
B. It is responsible for transporting sugars from the leaves to the roots
C. It has a high concentration of starch grains
D. It is composed of living cells

Correct Answer: A

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Question 13
The theory of evolution by natural selection was first proposed by Charles Darwin in his book 'On the Origin of Species'. What is the main mechanism by which evolution occurs?
A. Genetic drift
B. Mutation
C. Gene flow
Correct D. Natural selection

Correct Answer: D

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Question 14
The e\cosystem of a coral reef is characterized by a diverse array of species. What is the primary source of energy for this e\cosystem?
Correct A. Photosynthesis
B. Decomposition
C. Detritivory
D. Herbivory

Correct Answer: A

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Question 15
The bacterium Escherichia coli (E. coli) is a common inhabi\tant of the human gut. What is the primary function of the flagella in E. coli?
A. To produce ATP
Correct B. To move the bacterium through the gut
C. To synthesize proteins
D. To degrade carbohydrates

Correct Answer: B

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Question 16
The process of natural selection can be described as a mechanism that favors the survival and reproduction of individuals with traits that are better suited to their environment. Which of the following is a key consequence of this process?
A. Increased genetic variation within a population
Correct B. Reduced genetic variation within a population
C. No change in genetic variation within a population
D. Increased genetic variation between populations

Correct Answer: B

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Question 17
In the context of hormonal coordination, what is the primary function of the hypothalamus?
A. To regulate body temperature
B. To control hunger and thirst
Correct C. To stimulate the release of hormones
D. To regulate sleep and wakefulness

Correct Answer: C

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Question 18
Asexual reproduction involves the production of offspring without the involvement of gametes. Which of the following is an example of asexual reproduction?
A. Budding in yeast
B. Binary fission in bacteria
C. Spore formation in fungi
Correct D. All of the above

Correct Answer: D

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Question 19
The xylem tissue in plants is responsible for transporting water and minerals from the roots to the leaves. Which of the following is a key feature of xylem tissue?
Correct A. It is composed of dead cells
B. It is responsible for transporting sugars
C. It is composed of living cells
D. It is responsible for transporting gases

Correct Answer: A

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Question 20
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 21
In a population of 1000 individuals, the Hardy-Weinberg principle predicts that the frequency of the recessive allele (q) is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele (p)?
Correct A. 0.8
B. 0.6
C. 0.4
D. 0.2

Correct Answer: A

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Question 22
A diagram of the human brain is shown below. Which part of the brain is responsible for proces\sing visual information?
A. Cerebellum
Correct B. Cerebrum
C. Brainstem
D. Spinal Cord

Correct Answer: B

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Question 23
A 2.0 L flask contains 0.5 mol of an ideal gas at 300 K. What is the pressure of the gas?
A. 1.5 atm
Correct B. 2.0 atm
C. 3.0 atm
D. 4.0 atm

Correct Answer: B

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Question 24
A diagram of the water cycle is shown below. Which process is responsible for the formation of clouds?
A. Evaporation
Correct B. Condensation
C. Precipitation
D. Runoff

Correct Answer: B

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Question 25
A 5.0 g sample of a compound is analyzed by combustion analysis and found to contain 3.0 g of carbon and 1.5 g of hydrogen. What is the empirical formula of the compound?
Correct A. CH2O
B. C2H4O
C. C3H6O
D. C4H8O

Correct Answer: A

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