POST UTME BSU 2021 Biology | Objective

Are you preparing for POST UTME BSU 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.

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Question 1
In a closed system, what is the net effect of the reaction 2CO2 + 2H2O → C6H12O6 + 6O2 on the concentration of oxygen?
A. The concentration of oxygen increases.
Correct B. The concentration of oxygen decreases.
C. The concentration of oxygen remains the same.
D. The concentration of oxygen is not affected.

Correct Answer: B

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Question 2
What is the primary function of the Golgi apparatus in a plant cell?
A. Protein synthesis
B. Cell signaling
C. Lipid synthesis
Correct D. Protein modification and transport

Correct Answer: D

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Question 3
A diagram of the human respiratory system is shown below. What is the function of the alveoli?
Correct A. Gas exchange
B. Filtering of dust particles
C. Production of mucus
D. Regulation of breathing rate

Correct Answer: A

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Question 4
What is the process by which plants convert light energy into chemical energy?
A. Respiration
Correct B. Photosynthesis
C. Transpiration
D. Osmosis

Correct Answer: B

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Question 5
A diagram of the human digestive system is shown below. What is the function of the pancreas?
A. Production of bile
Correct B. Production of digestive enzymes
C. Absorption of nutrients
D. Storage of waste

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 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. 0.04

Correct Answer: A

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Question 7
A 2.5 L flask contains 0.5 M HCl. If 1.0 M NaOH is added to the flask, what is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
Correct C. 1.5 M
D. 2.0 M

Correct Answer: C

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Question 8
In a certain e\cosystem, the primary producers are phytoplankton, and the primary consumers are zooplankton. If the phytoplankton population is 1000 g/m^2 and the zooplankton population is 500 g/m^2, what is the ratio of primary producers to primary consumers?
A. 1:1
Correct B. 1:2
C. 2:1
D. 3:1

Correct Answer: B

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Question 9
A certain species of plant has a 50% chance of producing a flower. If 1000 plants are grown, how many are expected to produce flowers?
A. 250
Correct B. 500
C. 750
D. 1000

Correct Answer: B

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Question 10
A 10 kg block is attached to a horizontal spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.5 m and released, what is the maximum speed of the block?
A. 1.0 m/s
Correct B. 2.0 m/s
C. 3.0 m/s
D. 4.0 m/s

Correct Answer: B

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Question 11
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. 0.36
C. 0.64
D. 0.84

Correct Answer: A

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Question 12
A 2.5 L flask contains 0.5 M HCl. If 1.5 L of this solution is removed and replaced with 1.5 L of 0.5 M NaOH, what is the concentration of the resulting solution?
A. 0.25 M
Correct B. 0.5 M
C. 0.75 M
D. 1.0 M

Correct Answer: B

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Question 13
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'?
A. 1/4
Correct B. 1/2
C. 3/4
D. 1

Correct Answer: B

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Question 14
A 10 L flask contains 2.5 L of 0.5 M HCl. If 2 L of this solution is removed and replaced with 2 L of 0.5 M NaOH, what is the concentration of the resulting solution?
A. 0.25 M
Correct B. 0.5 M
C. 0.75 M
D. 1.0 M

Correct Answer: B

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Question 15
A population of Drosophila melanogaster has a frequency of the dominant allele 'A' of 0.8. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype 'aa'?
Correct A. 0.16
B. 0.36
C. 0.64
D. 0.84

Correct Answer: A

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Question 16
In the context of osmoregulation, what is the primary function of the kidneys in maintaining the balance of electrolytes and water in the body?
A. To regulate blood pressure
B. To remove waste products from the blood
Correct C. To maintain the balance of electrolytes and water
D. To regulate body temperature

Correct Answer: C

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Question 17
A population of Drosophila melanogaster is being studied for its evolutionary adaptation to a changing environment. Which of the following is a likely outcome of natural selection in this population?
A. The population will become more genetically diverse
Correct B. The population will adapt to the changing environment
C. The population will become less fit
D. The population will go extinct

Correct Answer: B

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Question 18
A cell is undergoing mitosis. Which of the following stages is characterized by the separation of sister chromatids?
A. Prophase
B. Metaphase
Correct C. Anaphase
D. Telophase

Correct Answer: C

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Question 19
A person is experiencing respiratory distress due to a severe asthma attack. Which of the following is a likely consequence of the increased airway resis\tance?
A. Increased oxygen levels in the blood
B. Decreased lung volume
Correct C. Increased airway pressure
D. Decreased respiratory rate

Correct Answer: C

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Question 20
A couple is trying to conceive a child. Which of the following is a likely cause of infertility in the male partner?
A. Low sperm count
B. Poor sperm motility
C. Abnormal sperm morpho\logy
Correct D. All of the above

Correct Answer: D

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Question 21
In a closed e\cosystem, the rate of respiration in a population of organisms is directly proportional to the concentration of oxygen in the atmosphere. If the concentration of oxygen decreases by 20% and the rate of respiration decreases by 15%, what is the ratio of the initial rate of respiration to the final rate of respiration?
Correct A. 1.25
B. 1.5
C. 1.75
D. 2.0

Correct Answer: A

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Question 22
A population of rabbits is introduced to a new habitat with an abundance of food and water. The population grows exponentially, with an initial population of 10 rabbits and a growth rate of 20% per month. After 6 months, the population has grown to 324 rabbits. What is the carrying capacity of the habitat?
A. 1000
B. 2000
Correct C. 3000
D. 4000

Correct Answer: C

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Question 23
A plant has a root system that absorbs water and nutrients from the soil. The root system is made up of a network of xylem and phloem tissues. What is the primary function of the xylem tissue in the root system?
Correct A. absorbing water and nutrients
B. transporting sugars and other organic compounds
C. supporting the plant's structure
D. regulating the plant's growth

Correct Answer: A

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Question 24
The process of natural selection acts on the variation in a population, leading to the adaptation of the population to its environment. What is the driving force behind this adaptation?
A. mutation
B. genetic drift
C. gene flow
Correct D. environmental pressure

Correct Answer: D

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Question 25
The nervous system is responsible for transmitting signals throughout the body. What is the primary function of the synapse in the nervous system?
Correct A. transmitting signals from one neuron to another
B. regulating the strength of the signal
C. supporting the structure of the neuron
D. controlling the release of neurotransmitters

Correct Answer: A

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