POST UTME UNIOSUN 2018 Biology | Objective

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Question 1
A researcher is studying the effect of pH on the growth of E. coli. The researcher finds that the growth rate of E. coli is maximum at a pH of 7. If the pH of the medium is 5, what is the growth rate of E. coli?
A. 0.5% per hour
B. 1% per hour
C. 2% per hour
D. 5% per hour
Question 2
A diagram of the human eye is shown below. Which of the following statements is true about the structure of the eye?
A. The cornea is the transparent part of the eye.
B. The iris is the colored part of the eye.
C. The retina is the light-sensitive part of the eye.
D. The lens is the part of the eye that changes shape to focus light.
Question 3
In the context of evolutionary theories, what is the primary mechanism by which species adapt to their environments?
A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation
Question 4
A diagram of the human respiratory system is shown below. Which part of the system is responsible for exchanging oxygen and carbon dioxide?
A. Lungs
B. Trachea
C. Diaphragm
D. Bronchi
Question 5
A diagram of the human nervous system is shown below. Which of the following statements is true about the structure of the nervous system?
Question 6
In a tropical rainforest e\cosystem, what is the primary role of the decomposers?
A. To produce organic compounds from inorganic subs\tances
B. To break down dead organisms and recycle nutrients
C. To synthesize complex molecules from simple subs\tances
D. To regulate the population of herbivores
Question 7
Which of the following is an example of asexual reproduction in plants?
A. Budding
B. Fragmentation
C. Runners
D. Rhizome
Question 8
The theory of evolution by natural selection proposes that species evolve over time through a process of variation, mutation, genetic drift, and gene flow. Which of the following is an example of a mechanism that contributes to genetic variation?
A. Mutation
B. Gene flow
C. Genetic drift
D. Artificial selection
Question 9
A diagram of the water cycle is shown below. What is the process labeled 'A'?
A. Evaporation
B. Condensation
C. Precipitation
D. Runoff
Question 10
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'Rr'?
A. 0.5
B. 0.75
C. 0.25
D. 0.33
Question 11
A diagram of the human skeletal system is shown below. Which of the following statements is true about the structure of the skeletal system?
A. The skull is the bony structure that protects the brain.
B. The ribcage is the bony structure that protects the heart and lungs.
C. The vertebrae are the bony structures that make up the spine.
D. The pelvis is the bony structure that supports the body's weight.
Question 12
A diagram of a plant cell is shown below. Identify the part labeled A.
A. Nucleus
B. Mitochondria
C. Chloroplast
D. Vacuole
Question 13
In the context of sense organs, what is the primary function of the olfactory epithelium?
A. To detect light
B. To detect sound
C. To detect smell
D. To detect taste
Question 14
What is the primary mechanism by which plants undergo photosynthesis?
A. Respiration
B. Transpiration
C. Photosynthesis
D. Translocation
Question 15
In the context of osmoregulation, what is the primary function of the hormone aldosterone?
A. To regulate blood pressure
B. To remove waste products from the blood
C. To maintain electrolyte balance
D. To regulate body temperature

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