POST UTME OSUSTECH 2023 Biology | Objective

Are you preparing for POST UTME OSUSTECH exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
In a closed e\cosystem, the rate of respiration in a population of rabbits is directly proportional to the square root of the population size. If the initial population size is 1000 and the rate of respiration is 10 units per day, what is the rate of respiration when the population size reaches 1600?
A. 6 units per day
Correct B. 8 units per day
C. 12 units per day
D. 16 units per day

Correct Answer: B

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Question 2
A 2.0 g sample of a subs\tance is dissolved in 100 mL of water. If the osmotic pressure of the solution is 2.5 atm at 25°C, what is the molar mass of the subs\tance?
A. 50 g/mol
B. 75 g/mol
C. 100 g/mol
Correct D. 125 g/mol

Correct Answer: D

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Question 3
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
A. Mitochondria
B. Chloroplast
Correct C. Nucleus
D. Vacuole

Correct Answer: C

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Question 4
A 5.0 L sample of a gas at 2.0 atm and 25°C is compressed to 10.0 L at cons\tant temperature. What is the new pressure?
A. 4.0 atm
B. 6.0 atm
C. 8.0 atm
Correct D. 10.0 atm

Correct Answer: D

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Question 5
A diagram of a titration setup is shown below. Identify the part labeled 'B'.
A. Titration flask
Correct B. Burette
C. Pipette
D. Erlenmeyer flask

Correct Answer: B

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Question 6
A study on the effects of hormonal coordination on the reproductive system of a certain species revealed that the administration of a specific hormone resulted in a significant increase in the number of offspring. However, the same hormone had no effect on the reproductive system of another species. What can be concluded about the hormonal coordination in these species?
A. The hormonal coordination in the first species is more complex than in the second species.
B. The hormonal coordination in the second species is more sensitive to the hormone.
Correct C. The hormone has a different effect on the reproductive system of the first species compared to the second species.
D. The hormonal coordination in both species is the same.

Correct Answer: C

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Question 7
A cell is placed in a solution with a pH of 4. The cell membrane is permeable to hydrogen ions. What will happen to the cell?
Correct A. The cell will swell and eventually burst.
B. The cell will shrink and eventually die.
C. The cell will remain unchanged.
D. The cell will undergo mitosis.

Correct Answer: A

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Question 8
A species of plant has a unique characteristic where its leaves are able to change color in response to changes in temperature. What type of adaptation is this?
A. Camouflage adaptation
B. Warning coloration adaptation
Correct C. Thermoregulatory adaptation
D. Photoperiodic adaptation

Correct Answer: C

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Question 9
A microorganism is able to break down a complex organic compound into simpler compounds. What type of metabolic process is this?
A. Photosynthesis
B. Respiration
Correct C. Decomposition
D. Fermentation

Correct Answer: C

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Question 10
A species of animal has a unique characteristic where its body temperature remains cons\tant despite changes in the environment. What type of thermoregulation is this?
Correct A. Endothermy
B. Ectothermy
C. Heterothermy
D. Poikilothermy

Correct Answer: A

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Question 11
In the context of classification of living things, what is the primary function of the kingdom level?
Correct A. To group organisms based on their genetic makeup
B. To categorize organisms based on their physical characteristics
C. To identify organisms based on their metabolic processes
D. To classify organisms based on their eco\logical niches

Correct Answer: A

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Question 12
A plant 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 uptake
C. The cell will remain unchanged
D. The cell will undergo osmosis

Correct Answer: B

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Question 13
A microorganism is isolated from a patient with a severe infection. The microorganism is found to be a gram-positive, catalase-negative bacterium. What is the most likely cause of the infection?
A. Staphylococcus aureus
Correct B. Streptococcus pneumoniae
C. Escherichia coli
D. Pseudomonas aeruginosa

Correct Answer: B

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Question 14
A patient is diagnosed with a disease caused by a virus that replicates in the host cell's cytoplasm. What is the primary mechanism of viral replication?
A. Transcription and translation
B. Replication and transcription
C. Translation and replication
Correct D. Transcription and replication

Correct Answer: D

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Question 15
A plant's xylem tissue is responsible for transporting what subs\tance?
Correct A. Water and minerals
B. Sugars and amino acids
C. Hormones and waste products
D. Gases and ions

Correct Answer: A

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Question 16
In a population of 1000 individuals, 20% are heterozygous for a disease-cau\sing allele. If the allele is recessive, what is the probability that a randomly selected individual will be affected by the disease?
A. 0.2
Correct B. 0.4
C. 0.6
D. 0.8

Correct Answer: B

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Question 17
A diagram of the human eye is shown below. Identify the part labeled 'A'.
Correct A. Cornea
B. Iris
C. Retina
D. Lens

Correct Answer: A

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Question 18
A 2.0 L flask contains 0.050 M NaCl at 25°C. If 0.100 M HCl is slowly added to the solution, what is the resulting concentration of NaCl?
A. 0.050 M
Correct B. 0.075 M
C. 0.100 M
D. 0.125 M

Correct Answer: B

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Question 19
A diagram of the human respiratory system is shown below. Identify the part labeled 'B'.
A. Trachea
Correct B. Lungs
C. Diaphragm
D. Bronchi

Correct Answer: B

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Question 20
A population of 1000 individuals has a mean height of 170 cm and a s\tandard deviation of 10 cm. If a random sample of 50 individuals is taken, what is the probability that the sample mean height is greater than 175 cm?
A. 0.1
B. 0.2
C. 0.3
Correct D. 0.4

Correct Answer: D

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Question 21
In a closed e\cosystem, the rate of photosynthesis is directly proportional to the rate of respiration. Which of the following best describes the relationship between the two processes?
A. The rate of photosynthesis is always greater than the rate of respiration.
B. The rate of photosynthesis is always equal to the rate of respiration.
C. The rate of photosynthesis is inversely proportional to the rate of respiration.
Correct D. The rate of photosynthesis is directly proportional to the rate of respiration.

Correct Answer: D

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Question 22
A population of rabbits is introduced to a new island with an abundance of food and no natural predators. Which of the following best describes the expected change in the population size over time?
A. The population size will remain cons\tant.
B. The population size will decrease over time.
Correct C. The population size will increase exponentially over time.
D. The population size will fluctuate randomly over time.

Correct Answer: C

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Question 23
A bio\logist is studying the classification of living organisms. Which of the following is a characteristic of the kingdom Animalia?
A. Multicellularity
B. Cell wall presence
Correct C. Heterotrophy
D. Photosynthesis

Correct Answer: C

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Question 24
A patient is experiencing symptoms of dehydration. Which of the following is a primary function of the xylem in the transport of water and minerals in plants?
A. Transport of sugars and amino acids
Correct B. Transport of water and minerals
C. Transport of hormones and other signaling molecules
D. Transport of waste products

Correct Answer: B

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Question 25
A researcher is studying the process of digestion in the human body. Which of the following enzymes is responsible for breaking down proteins into smaller peptides?
A. Amylase
B. Lipase
Correct C. Tryp\sin
D. Pep\sin

Correct Answer: C

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