POST UTME BSU 2018 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 2018 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In the context of eco\logical succession, what is the primary mechanism driving the transition from a pioneer community to a climax community?
A. Primary production
B. Nutrient cycling
Correct C. Predation and competition
D. Climate change

Correct Answer: C

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Question 2
A plant cell is placed in a solution with a high concentration of sucrose. What is the expected outcome?
A. The plant cell will undergo mitosis
B. The plant cell will undergo meiosis
Correct C. The plant cell will absorb water and swell
D. The plant cell will undergo programmed cell death

Correct Answer: C

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Question 3
A population of rabbits is introduced to a new island. What is the expected outcome in terms of population growth?
A. Exponential growth
Correct B. Logistic growth
C. Sigmoid growth
D. No growth

Correct Answer: B

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Question 4
A scientist is studying the effect of pH on enzyme activity. What is the expected outcome?
A. Enzyme activity increases with increa\sing pH
Correct B. Enzyme activity decreases with increa\sing pH
C. Enzyme activity remains cons\tant with changing pH
D. Enzyme activity is unaffected by pH

Correct Answer: B

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Question 5
A bio\logist is studying the effect of light intensity on plant growth. What is the expected outcome?
Correct A. Plant growth increases with increa\sing light intensity
B. Plant growth decreases with increa\sing light intensity
C. Plant growth remains cons\tant with changing light intensity
D. Plant growth is unaffected by light intensity

Correct Answer: A

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Question 6
The process of meiosis results in the production of four haploid cells from a diploid cell. Which of the following is a characteristic of the cells produced by meiosis?
A. They have the same number of chromosomes as the parent cell
Correct B. They have half the number of chromosomes as the parent cell
C. They have the same genetic makeup as the parent cell
D. They are genetically identical to each other

Correct Answer: B

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Question 7
The diagram below shows a cross-section of a plant root. What is the function of the cells labeled 'A'?
Correct A. To absorb water and minerals from the soil
B. To store food produced by photosynthesis
C. To produce hormones that regulate plant growth
D. To support the structure of the plant

Correct Answer: A

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Question 8
The graph below shows the relationship between the concentration of a substrate and the rate of enzyme activity. What is the type of enzyme kinetics represented by this graph?
Correct A. Michaelis-Menten kinetics
B. Lineweaver-Burk kinetics
C. Eadie-Hofstee kinetics
D. Hanes-Woolf kinetics

Correct Answer: A

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Question 9
The nervous system is responsible for transmitting signals between neurons. What is the name of the process by which a neuron generates an action potential?
A. Synaptic transmission
B. Neurotransmission
Correct C. Action potential
D. Resting potential

Correct Answer: C

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Question 10
The diagram below shows a cross-section of a cell. What is the function of the organelle labeled 'A'?
Correct A. To synthesize proteins
B. To store genetic information
C. To regulate cell growth
D. To transport materials across the cell membrane

Correct Answer: A

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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 size is 1000, what is the expected number of homozygous recessive individuals?
A. 0.4
B. 0.8
Correct C. 1.6
D. 2.0

Correct Answer: C

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Question 12
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. 1.0

Correct Answer: B

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Question 13
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
Correct A. Nucleus
B. Mitochondria
C. Cell wall
D. Chloroplast

Correct Answer: A

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Question 14
A diagram of a human respiratory system is shown below. Identify the part labeled 'B'.
A. Trachea
Correct B. Diaphragm
C. Lungs
D. Bronchi

Correct Answer: B

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Question 15
A diagram of a human skeletal system is shown below. Identify the part labeled 'C'.
A. Ribs
B. Skull
Correct C. Vertebrae
D. Pelvis

Correct Answer: C

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Question 16
In the context of xylem transport, what is the primary mechanism by which water and minerals are absorbed by the roots and transported to the leaves?
Correct A. Transpiration pull
B. Root pressure
C. Capillary action
D. Osmosis

Correct Answer: A

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Question 17
A plant cell is placed in a solution with a high concentration of sucrose. What is the expected outcome?
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 burst due to osmotic pressure

Correct Answer: B

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Question 18
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
Correct A. To focus light on the retina
B. To detect movement
C. To regulate pupil size
D. To produce tears

Correct Answer: A

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Question 19
A population of rabbits is introduced to a new island. What is the expected outcome in terms of population growth?
A. The population will remain cons\tant
B. The population will decrease due to predation
Correct C. The population will increase exponentially
D. The population will stabilize at a carrying capacity

Correct Answer: C

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Question 20
A diagram of the human digestive system is shown below. What is the function of the part labeled 'B'?
Correct A. To break down proteins
B. To absorb nutrients
C. To store waste
D. To regulate pH

Correct Answer: A

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Question 21
In a population of E. coli bacteria, the mutation rate is 10^-5 per generation. If the population size is 10^6, what is the expected number of mutations per generation?
Correct A. 10^-1
B. 10^0
C. 10^1
D. 10^2

Correct Answer: A

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Question 22
A cell is placed in a solution with a concentration of 0.1 M glu\cose. If the cell is 10^-3 m^3 in volume, what is the total amount of glu\cose in moles?
A. 10^-6
Correct B. 10^-5
C. 10^-4
D. 10^-3

Correct Answer: B

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Question 23
A person has a blood pressure of 120/80 mmHg. If the mean arterial pressure is 90 mmHg, what is the resis\tance of the systemic circulation?
A. 10^3
Correct B. 10^4
C. 10^5
D. 10^6

Correct Answer: B

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Question 24
A cell membrane has a surface area of 10^-4 m^2 and a thickness of 10^-8 m. If the membrane is made of a material with a Young's modulus of 10^9 Pa, what is the tension in the membrane?
A. 10^-1
B. 10^0
Correct C. 10^1
D. 10^2

Correct Answer: C

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Question 25
A person is given a dose of 100 mg of a drug with a volume of distribution of 10 L. If the drug is 90% bound to plasma proteins, what is the free \fraction of the drug?
A. 0.1
Correct B. 0.2
C. 0.3
D. 0.4

Correct Answer: B

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