POST UTME RSU 2021 Biology | Objective

Are you preparing for POST UTME RSU 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 is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'R'?
Correct A. 0.8
B. 0.6
C. 0.4
D. 0.2

Correct Answer: A

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Question 2
A plant with the genotype 'Aa' is crossed with a plant with the genotype 'aa'. What is the probability that the offspring will have the genotype 'AA'?
Correct A. 0.25
B. 0.5
C. 0.75
D. 0.9

Correct Answer: A

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Question 3
A solution of 0.1 M glu\cose is diluted to 0.01 M. What is the new volume of the solution?
A. 10 mL
Correct B. 100 mL
C. 1000 mL
D. 10 L

Correct Answer: B

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Question 4
A diagram of the human respiratory system is shown below. Identify the part labeled 'A'.
Correct A. Lungs
B. Trachea
C. Diaphragm
D. Bronchi

Correct Answer: A

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Question 5
A diagram of the human circulatory system is shown below. Identify the part labeled 'B'.
A. Heart
Correct B. Aorta
C. Pulmonary Veins
D. Coronary Arteries

Correct Answer: B

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Question 6
The process of cellular respiration in plants involves the breakdown of glu\cose to produce ATP, NADH, and FADH2. Which of the following statements is FALSE regarding the electron transport chain?
A. The electron transport chain occurs in the mitochondria.
B. The electron transport chain is the site of ATP synthesis.
C. The electron transport chain involves the transfer of electrons from NADH to oxygen.
Correct D. The electron transport chain is the site of glu\cose breakdown.

Correct Answer: D

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Question 7
In the context of evolutionary theory, what is the term for the process by which a population becomes reproductively isolated from other populations, leading to the formation of new species?
Correct A. Speciation
B. Adaptation
C. Natural Selection
D. Genetic Drift

Correct Answer: A

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Question 8
In a forest e\cosystem, what is the primary function of the decomposer community?
A. To produce organic compounds from inorganic subs\tances.
Correct B. To break down dead plant and animal matter.
C. To form symbiotic relationships with other organisms.
D. To regulate the population of herbivores.

Correct Answer: B

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Question 9
In a cell, what is the term for the process by which the cell membrane becomes more permeable to allow the movement of subs\tances into and out of the cell?
A. Endocytosis
B. Exocytosis
Correct C. Osmosis
D. Diffusion

Correct Answer: C

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Question 10
In the context of excretion, what is the term for the process by which the kidneys filter waste products from the blood and excrete them in the urine?
Correct A. Glomerular filtration
B. Tubular reabsorption
C. Tubular secretion
D. Ureteral peristalsis

Correct Answer: A

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Question 11
In a tropical rainforest e\cosystem, the primary consumers are primarily herbivores that feed on the abundant vegetation. Which of the following is a characteristic of these primary consumers?
A. They have a high metabolic rate
B. They have a low reproductive rate
Correct C. They have a long digestive tract
D. They have a large home range

Correct Answer: C

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Question 12
A neuron is a specialized cell that transmits signals through electrical and chemical means. What is the primary function of the axon hillock in a neuron?
Correct A. To generate action potentials
B. To synthesize neurotransmitters
C. To receive synaptic inputs
D. To regulate ion channels

Correct Answer: A

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Question 13
A population of rabbits is introduced to a new island with an abundance of food and no natural predators. According to the \logistic growth model, what will happen to the population size over time?
A. The population will increase exponentially
Correct B. The population will level off at a carrying capacity
C. The population will decrease over time
D. The population will remain cons\tant

Correct Answer: B

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Question 14
A genetic disorder is caused by a mutation in a \single gene that codes for a protein essential for proper development. What type of genetic variation is this an example of?
Correct A. Point mutation
B. Frameshift mutation
C. Deletion
D. Insertion

Correct Answer: A

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Question 15
A plant cell is placed in a solution with a high concentration of sucrose. What will happen to the cell's osmotic pressure?
Correct A. It will increase
B. It will decrease
C. It will remain the same
D. It will become negative

Correct Answer: A

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Question 16
In the process of osmoregulation, which of the following mechanisms is primarily responsible for the excretion of excess ions in the kidneys?
Correct A. Active transport
B. Passive transport
C. Osmosis
D. Diffusion

Correct Answer: A

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Question 17
Which of the following types of cells is primarily responsible for the production of melanin?
Correct A. Melanocytes
B. Keratinocytes
C. Fibroblasts
D. Epithelial cells

Correct Answer: A

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Question 18
In the context of evolutionary theory, which of the following mechanisms is responsible for the adaptation of a population to its environment?
Correct A. Natural selection
B. Genetic drift
C. Gene flow
D. Mutation

Correct Answer: A

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Question 19
Which of the following types of transport systems in plants is responsible for the movement of water and minerals from the roots to the leaves?
Correct A. Xylem
B. Phloem
C. Cortex
D. Endodermis

Correct Answer: A

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Question 20
In the context of cell division, which of the following stages is characterized by the separation of the sister chromatids?
A. Prophase
B. Metaphase
Correct C. Anaphase
D. Telophase

Correct Answer: C

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Question 21
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the expected 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 22
A researcher isolates a bacterium that exhibits a unique phenotype. The bacterium has a mutation in the gene encoding the enzyme responsible for the conversion of glu\cose to pyruvate. Which of the following enzymes is most likely affected by this mutation?
A. Pyruvate kinase
Correct B. Phosphofructokinase
C. Hexokinase
D. Glyceraldehyde-3-phosphate dehydrogenase

Correct Answer: B

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Question 23
A cell is placed in a solution with a pH of 7.4. If the cell membrane has a permeability coefficient of 10^-5 cm/s, what is the expected rate of diffusion of H+ ions into the cell?
A. 10^-3 M/s
B. 10^-4 M/s
Correct C. 10^-5 M/s
D. 10^-6 M/s

Correct Answer: C

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Question 24
A geneticist is studying the inheri\tance of a trait in a population of mice. The trait is determined by a \single gene with two alleles: 'B' and 'b'. The frequency of the 'B' allele is 0.8, and the frequency of the 'b' allele is 0.2. What is the expected frequency of the homozygous recessive genotype?
Correct A. 0.16
B. 0.36
C. 0.64
D. 0.04

Correct Answer: A

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Question 25
A researcher is studying the effect of temperature on the growth rate of a microorganism. The growth rate is measured in units of cells per minute, and the temperature is measured in degrees Celsius. The data is plotted on a graph, and the resulting curve is a sigmoidal curve. What is the name of the mathematical model that best describes this curve?
Correct A. Logistic growth model
B. Exponential growth model
C. Linear growth model
D. Quadratic growth model

Correct Answer: A

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