POST UTME NOUN 2024 Biology | Objective

Are you preparing for POST UTME NOUN exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2024 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 xylem transport, what is the primary function of the pit membrane?
Correct A. To regulate water flow between adjacent tracheids
B. To facilitate the passage of solutes between adjacent tracheids
C. To prevent the collapse of tracheids
D. To maintain the structural integrity of the xylem

Correct Answer: A

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Question 2
A 25-year-old woman presents with symptoms of hyperthyroidism. Which of the following hormones is most likely responsible for her condition?
A. Thyroid-stimulating hormone (TSH)
Correct B. Triiodothyronine (T3)
C. Thyroxine (T4)
D. Adrenocorticotropic hormone (ACTH)

Correct Answer: B

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Question 3
A geneticist is studying the inheri\tance of a particular trait in a population. The trait is determined by a \single gene with two alleles: A and a. The genotype of the population is 0.6Aa + 0.4aa. What is the expected frequency of the A allele in the population?
Correct A. 0.6
B. 0.4
C. 0.7
D. 0.8

Correct Answer: A

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Question 4
A 30-year-old man presents with symptoms of respiratory distress. His arterial blood gas (ABG) shows a pH of 7.35, PCO2 of 40 mmHg, and PO2 of 80 mmHg. What is the most likely diagnosis?
A. Asthma
Correct B. Chronic obstructive pulmonary disease (COPD)
C. Pneumonia
D. Pulmonary embolism

Correct Answer: B

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Question 5
A 20-year-old woman presents with symptoms of growth hormone deficiency. Her growth hormone levels are 0.5 ng/mL. What is the expected effect on her growth rate?
A. Increased growth rate
Correct B. Decreased growth rate
C. No effect on growth rate
D. Variable growth rate

Correct Answer: B

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Question 6
In the context of evolutionary theory, what is the primary mechanism by which species adapt to their environment?
Correct A. Natural Selection
B. Genetic Drift
C. Mutation
D. Gene Flow

Correct Answer: A

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Question 7
A diagram of the xylem and phloem tissues in a plant stem is shown below. Which of the following statements is true about the xylem tissue?
A. Xylem tissue is responsible for transporting sugars produced during photosynthesis.
Correct B. Xylem tissue is responsible for transporting water and minerals from the roots to the leaves.
C. Xylem tissue is responsible for transporting gases between the roots and the leaves.
D. Xylem tissue is responsible for transporting waste products from the leaves to the roots.

Correct Answer: B

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Question 8
A microorganism is isolated from a patient with a severe infection. The microorganism is found to be a Gram-positive, catalase-negative bacterium. Which of the following 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 9
A diagram of the reproductive system of a flowering plant is shown below. Which of the following structures is responsible for producing the male gametes?
Correct A. Anther
B. Filament
C. Stamen
D. Pistil

Correct Answer: A

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Question 10
A diagram of the classification of living things is shown below. Which of the following kingdoms is characterized by the presence of cell walls made of chitin?
A. Animalia
Correct B. Fungi
C. Plantae
D. Protista

Correct Answer: B

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Question 11
In asexual reproduction, what is the primary mechanism by which genetic variation is introduced?
A. Mutation
Correct B. Genetic recombination
C. Gene duplication
D. Gene deletion

Correct Answer: B

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Question 12
What is the primary function of the excretory system in humans?
A. To regulate body temperature
Correct B. To remove waste products from the body
C. To maintain fluid balance
D. To produce hormones

Correct Answer: B

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Question 13
Which of the following tissues is primarily composed of epithelial cells?
A. Connective tissue
B. Muscle tissue
C. Nervous tissue
Correct D. Epithelial tissue

Correct Answer: D

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Question 14
What is the process by which cells divide to produce two daughter cells?
Correct A. Mitosis
B. Meiosis
C. Binary fission
D. Endoreduplication

Correct Answer: A

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Question 15
Which of the following is an example of a multicellular organism?
A. Bacteria
B. Amoeba
Correct C. Human
D. Fungus

Correct Answer: C

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Question 16
In the context of hormonal coordination, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?
A. Regulation of body temperature
B. Maintenance of blood glu\cose levels
Correct C. Stress response and adaptation
D. Regulation of appetite and satiety

Correct Answer: C

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Question 17
A plant is placed in a solution with a high concentration of sucrose. What is the expected outcome in terms of photosynthesis?
Correct A. Increased rate of photosynthesis
B. Decreased rate of photosynthesis
C. No change in rate of photosynthesis
D. Inhibition of photosynthesis

Correct Answer: A

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Question 18
A diagram of the xylem and phloem tissues in a plant stem is shown below. What is the primary function of the xylem tissue?
Correct A. Transport of water and minerals
B. Transport of sugars and amino acids
C. Support and structure
D. Storage of food

Correct Answer: A

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Question 19
A population of rabbits is introduced to a new island with an abundance of food and no natural predators. What is the expected outcome in terms of population growth?
Correct A. Exponential growth
B. Linear growth
C. No change in population size
D. Decline in population size

Correct Answer: A

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Question 20
A diagram of the human digestive system is shown below. What is the primary function of the small intestine?
A. Mechanical digestion of food
B. Chemical digestion of proteins
Correct C. Absorption of nutrients
D. Storage of waste

Correct Answer: C

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Question 21
The Hardy-Weinberg principle states that allele frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?
A. Random mating
B. No mutation
C. No gene flow
Correct D. No natural selection

Correct Answer: D

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Question 22
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
Correct A. Nucleus
B. Mitochondria
C. Chloroplast
D. Vacuole

Correct Answer: A

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Question 23
The process of photosynthesis occurs in which of the following parts of a plant?
A. Roots
B. Stems
Correct C. Leaves
D. Flowers

Correct Answer: C

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Question 24
The following diagram shows a simple e\cosystem. Identify the producer in the e\cosystem.
Correct A. Grass
B. Fish
C. Bacteria
D. Fungi

Correct Answer: A

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Question 25
The following equation represents the rate of diffusion of a subs\tance across a membrane. Which of the following is a necessary condition for the equation to hold?
A. The subs\tance is in a state of equilibrium
Correct B. The subs\tance is in a state of non-equilibrium
C. The membrane is permeable
D. The membrane is impermeable

Correct Answer: B

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