POST UTME REDEEMERS UNIVERSITY 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 L flask contains 0.5 M HCl. If 1.0 M NaOH is added to the flask, what is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 2
In a desert e\cosystem, what is the primary mechanism by which plants regulate their water loss through transpiration?
A. Stomatal closure
B. Cuticular transpiration
C. Transpiration pull
D. Root pressure
Question 3
In asexual reproduction, what is the term for the process by which a \single cell divides to produce two daughter cells?
A. Mitosis
B. Meiosis
C. Binary fission
D. Budding
Question 4
A 20-year-old man is diagnosed with a rare disease that affects his ability to regulate his blood sugar levels. Which of the following is the most likely cause of his condition?
A. Genetic mutation in the HNF1A gene
B. Genetic mutation in the HNF4A gene
C. Genetic mutation in the PDX1 gene
D. Genetic mutation in the INS gene
Question 5
A species of bird is found in a specific type of forest. If the forest is cleared for agriculture, what is the likely effect on the bird population?
A. The population will increase
B. The population will decrease
C. The population will remain the same
D. The population will migrate to a different forest
Question 6
A diagram of a human eye is shown below. Identify the part labeled A.
A. Cornea
B. Iris
C. Retina
D. Optic nerve
Question 7
In a population of 1000 individuals, the frequency of the dominant allele is 0.6. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the recessive allele?
A. 0.2
B. 0.3
C. 0.4
D. 0.5
Question 8
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
A. To focus light on the retina
B. To detect movement
C. To regulate the amount of light entering the eye
D. To produce tears
Question 9
A plant cell has a vacuole that contains 0.5 M KCl. If the cell is placed in a solution with a pH of 7.0, what is the concentration of Cl- ions outside the cell?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 10
A 50-year-old man is diagnosed with a rare genetic disorder that affects his sense of smell. Which of the following is the most likely cause of his condition?
A. Genetic mutation in the OR6A2 gene
B. Genetic mutation in the TAS2R38 gene
C. Genetic mutation in the TRPV1 gene
D. Genetic mutation in the P2RY8 gene
Question 11
In the process of osmoregulation, the kidneys play a crucial role in maintaining the balance of electrolytes and water in the body. Which of the following best describes the mechanism by which the kidneys regulate the concentration of sodium ions in the blood?
A. The kidneys reabsorb sodium ions from the filtrate back into the bloodstream.
B. The kidneys secrete sodium ions into the filtrate, which are then excreted in the urine.
C. The kidneys regulate the amount of sodium ions in the blood by adjusting the rate of filtration.
D. The kidneys do not play a direct role in regulating the concentration of sodium ions in the blood.
Question 12
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. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 13
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
A. 5
B. 6
C. 7
D. 8
Question 14
A 10-year-old girl is diagnosed with a rare disease that affects her ability to regulate her body temperature. Which of the following is the most likely cause of her condition?
A. Genetic mutation in the TRPV1 gene
B. Genetic mutation in the TRPM8 gene
C. Genetic mutation in the KCNQ1 gene
D. Genetic mutation in the SCN9A gene
Question 15
A 40-year-old man is diagnosed with a rare disease that affects his ability to regulate his body temperature. Which of the following is the most likely cause of his condition?
A. Genetic mutation in the TRPV1 gene
B. Genetic mutation in the TRPM8 gene
C. Genetic mutation in the KCNQ1 gene
D. Genetic mutation in the SCN9A gene

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