POST UTME UNN 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the context of osmoregulation, what is the primary function of the kidneys in maintaining electrolyte balance?
A. To regulate the concentration of ions in the blood
B. To excrete excess water and maintain blood pressure
C. To reabsorb glu\cose and amino acids from the filtrate
D. To produce hormones that stimulate thirst
Question 2
A researcher is studying the genetic variation in a population of Drosophila melanogaster. Which of the following genetic principles best explains the observed variation in wing shape?
A. Natural selection acting on a pre-existing variation.
B. Genetic drift resulting from a small population size.
C. Mutation introducing a new allele for wing shape.
D. Gene flow from a neighboring population.
Question 3
A geneticist is studying the inheri\tance of a trait in a family. The trait is caused by a dominant allele. Which of the following genotypes would be expected to express the trait?
A. Homozygous recessive (rr)
B. Homozygous dominant (RR)
C. Heterozygous (Rr)
D. Neither RR nor rr
Question 4
A species of bird is evolving to adapt to a changing environment. Which of the following traits would be most beneficial for survival?
A. Increased beak size
B. Increased wing span
C. Increased webbed feet
D. Increased body size
Question 5
The diagram below shows a simplified representation of the human circulatory system. What is the function of the heart?
A. To pump blood from the heart to the rest of the body
B. To regulate the amount of oxygen in the blood
C. To produce hormones that stimulate growth and development
D. To filter waste products from the blood
Question 6
The diagram below shows a simplified representation of the human nervous system. What is the function of the spinal cord?
A. To transmit signals from the brain to the rest of the body
B. To regulate the autonomic nervous system
C. To provide structural support to the body
D. To produce hormones that stimulate growth and development
Question 7
A study on the effects of hormonal coordination in the human body revealed that the hypothalamus plays a crucial role in regulating body temperature. Which of the following statements best describes the relationship between the hypothalamus and body temperature?
A. The hypothalamus acts as a thermostat to maintain a cons\tant body temperature.
B. The hypothalamus produces hormones that increase body temperature in response to cold stress.
C. The hypothalamus produces hormones that decrease body temperature in response to heat stress.
D. The hypothalamus has no role in regulating body temperature.
Question 8
A diagram of the xylem and phloem tissues in a plant stem is shown below. What is the function of the xylem tissue?
A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the rest of the plant
C. To provide structural support to the plant
D. To regulate the opening and clo\sing of stomata
Question 9
A bio\logist is studying the evolution of a species over time. Which of the following mechanisms best explains the observed adaptation to a changing environment?
A. Natural selection acting on a pre-existing variation.
B. Genetic drift resulting from a small population size.
C. Mutation introducing a new allele for adaptation.
D. Gene flow from a neighboring population.
Question 10
In a tropical rainforest biome, which of the following organisms is most likely to be a primary consumer?
A. A large predatory snake
B. A small insectivorous bird
C. A herbivorous sloth
D. A carnivorous jaguar
Question 11
The diagram below shows a simplified representation of the human digestive system. What is the function of the pancreas?
A. To produce hormones that stimulate digestion
B. To produce enzymes that break down proteins
C. To produce bile that emulsifies fats
D. To absorb nutrients from the small intestine
Question 12
A diagram of a plant cell is shown below. What is the function of the organelle labeled 'A'?
A. Photosynthesis
B. Cell signaling
C. Protein synthesis
D. Cell division
Question 13
A population of rabbits is growing according to the \logistic growth model. If the carrying capacity is 1000 and the initial population is 100, what is the population after 5 generations?
A. 500
B. 750
C. 900
D. 950
Question 14
A patient is diagnosed with a bacterial infection caused by Staphylococcus aureus. Which of the following antibiotics is most likely to be effective against this bacterium?
A. Penicillin G
B. Ciprofloxacin
C. Vancomycin
D. Tetracycline
Question 15
A diagram of a human respiratory system is shown below. What is the function of the organelle labeled 'B'?
A. Gas exchange
B. Oxygen transport
C. Carbon dioxide transport
D. Nitrogen transport

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