POST UTME UNIOSUN 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the context of evolutionary theories, what is the primary driving force behind speciation?
A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation
Question 2
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 3
In the human body, the nervous system and the \endocrine system work together to regulate various bodily functions. Which of the following is an example of a hormone that is produced by the adrenal gland?
A. Adrenaline
B. Insulin
C. Thyroxine
D. Growth hormone
Question 4
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 5
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 6
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 7
Asexual reproduction in plants can occur through which of the following methods?
A. Budding
B. Fragmentation
C. Runners
D. All of the above
Question 8
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 9
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 20% per hour, what will be the population size after 3 hours?
A. 1000
B. 2000
C. 4000
D. 8000
Question 10
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 11
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 12
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 13
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'A'?
A. 0.8
B. 0.6
C. 0.4
D. 0.2
Question 14
Which of the following is an example of asexual reproduction in plants?
A. Budding
B. Fragmentation
C. Runners
D. Rhizome
Question 15
In a typical xylem vessel, what is the primary function of the lignin-rich secondary cell wall?
A. To provide structural support to the vessel
B. To facilitate the transport of water and minerals
C. To regulate the rate of transpiration
D. To store starch and other nutrients

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