POST UTME OAU 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A geneticist is studying the inheri\tance of a particular trait in a population. Which of the following is a characteristic of a dominant allele?
A. Expressed in the presence of a recessive allele
B. Not expressed in the presence of a dominant allele
C. Always expressed in a heterozygous individual
D. Never expressed in a homozygous individual
Question 2
In a desert e\cosystem, the primary consumers are mostly insects that feed on the primary producers. What is the likely effect of a decrease in the primary producer population on the primary consumer population?
A. Increased primary consumer population
B. Decreased primary consumer population
C. No effect on primary consumer population
D. Increased decomposition
Question 3
A patient has a genetic disorder caused by a mutation in the HBB gene. Which of the following is a possible consequence of this mutation?
A. Sickle cell anemia
B. Thalassemia
C. Hemophilia
D. Cystic fibrosis
Question 4
A chemist is studying the properties of a particular compound. Which of the following is a characteristic of a polar molecule?
A. Has a symmetrical distribution of electrons
B. Has a non-symmetrical distribution of electrons
C. Is always soluble in water
D. Is always insoluble in water
Question 5
A genetic cross is performed between two organisms with the following genotypes: F1 = AaBb and F2 = AaBb x aaBB. What is the probability of the offspring being homozygous recessive?
A. 1/4
B. 1/2
C. 3/4
D. 3/8
Question 6
A scientist is studying the effect of pH on the growth of E. coli bacteria. Which of the following is a likely outcome?
A. Increased growth at higher pH
B. Decreased growth at lower pH
C. No effect of pH on growth
D. Increased growth at lower pH
Question 7
In a human body, the circulatory system is responsible for transporting what?
A. Oxygen and carbon dioxide
B. Nutrients and waste products
C. Hormones and immune cells
D. All of the above
Question 8
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 homozygous dominant genotype 'AA'?
A. 0.36
B. 0.64
C. 0.8
D. 0.16
Question 9
In the context of hormonal coordination, what is the primary function of the hypothalamus?
A. To regulate body temperature
B. To regulate hunger and thirst
C. To regulate sleep and wakefulness
D. To regulate the pituitary gland
Question 10
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
A. Nucleus
B. Mitochondria
C. Chloroplast
D. Vacuole
Question 11
In a tropical rainforest, the primary producers are mostly "shade-tolerant" plants, which have adapted to the low light conditions. What is the likely effect of this adaptation on the overall e\cosystem?
A. Increased primary production
B. Decreased primary production
C. No effect on primary production
D. Increased decomposition
Question 12
A species of bird has a unique mating ritual where the male bird performs a complex dance to attract a female. What is the likely function of this dance?
A. To establish dominance
B. To attract a mate
C. To def\end territory
D. To communicate with other birds
Question 13
In a human lung, the alveoli are responsible for exchanging what?
A. Oxygen and carbon dioxide
B. Nitrogen and oxygen
C. Carbon dioxide and water
D. Oxygen and water
Question 14
In the context of asexual reproduction, what is the primary function of the zygote?
A. To form a new individual
B. To form a new cell
C. To form a new tissue
D. To form a new organ
Question 15
In a coral reef e\cosystem, the primary producers are mostly algae that live on the coral. What is the likely effect of a decrease in the coral population on the primary producer population?
A. Increased primary producer population
B. Decreased primary producer population
C. No effect on primary producer population
D. Increased decomposition

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