POST UTME SUMMIT UNIVERSITY 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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?
A. 0.16
B. 0.36
C. 0.64
D. 0.84
Question 2
A population of bacteria is growing exponentially. If the initial population is 100 cells and the population doubles every 2 hours, what will be the population after 6 hours?
A. 1000
B. 2000
C. 4000
D. 8000
Question 3
In the context of osmoregulation, what is the primary function of the kidneys in the human body?
A. To regulate blood pressure through the renin-angioten\sin-aldosterone system.
B. To maintain electrolyte balance by reabsorbing or excreting ions.
C. To regulate blood pH by adjusting the concentration of hydrogen ions.
D. To control the concentration of glu\cose in the blood.
Question 4
A diagram shows a cell with a nucleus and a mitochondria. Which of the following is a function of the mitochondria?
A. It is the site of protein synthesis.
B. It is the site of cell division.
C. It is the site of cellular respiration.
D. It is the site of cell signaling.
Question 5
The following diagram shows a cross-section of a plant root. What is the primary function of the tissue labeled 'A'?
A. To absorb water and minerals from the soil.
B. To store starch and other nutrients.
C. To produce hormones that regulate plant growth.
D. To support the structure of the plant.
Question 6
In the context of osmoregulation, what is the primary function of the hypothalamus in regulating thirst?
A. To regulate pH levels in the blood
B. To maintain the balance of electrolytes in the body
C. To regulate thirst and hunger
D. To regulate blood pressure
Question 7
A 2.5 L flask contains 0.5 M NaOH. If 25 mL of 1.5 M HCl is slowly added to the flask, what is the concentration of the resulting solution?
A. 0.6 M
B. 0.8 M
C. 1.0 M
D. 1.2 M
Question 8
A plant cell has a vacuole that contains 0.5 M sucrose. If the cell membrane is permeable to sucrose, what will be the concentration of sucrose in the cytosol after 1 hour?
A. 0.5 M
B. 0.25 M
C. 1.0 M
D. 1.5 M
Question 9
A population of 1000 rabbits is introduced to an island with an unlimited food supply. The population grows \logistically according to the equation dP/dt = rP\( 1-P/K \), where r = 0.2 and K = 10,000. What is the carrying capacity of the island?
A. 5000
B. 10,000
C. 20,000
D. 50,000
Question 10
The process of cellular respiration in plants involves the breakdown of glu\cose to produce ATP, NADH, and FADH2. Which of the following is the correct sequence of events in the electron transport chain?
A. NADH → FADH2 → ATP
B. FADH2 → NADH → ATP
C. ATP → NADH → FADH2
D. NADH → ATP → FADH2
Question 11
A plant cell has a vacuole that contains 0.5 M sucrose. If the cell membrane is permeable to sucrose, what will be the concentration of sucrose in the cytosol after 1 hour?
A. 0.5 M
B. 0.25 M
C. 1.0 M
D. 1.5 M
Question 12
A 2.5 L flask contains 0.5 M NaOH. If 25 mL of 1.5 M HCl is slowly added to the flask, calculate the pH of the resulting solution.
A. 0.5
B. 1.0
C. 1.5
D. 2.0
Question 13
The diagram below shows the structure of a mitochondrion.
A. The mitochondrial membrane is the outermost layer of the mitochondrion.
B. The mitochondrial matrix is the region where cellular respiration occurs.
C. The cristae are the infoldings of the mitochondrial membrane.
D. The porin is the channel that allows molecules to pass through the mitochondrial membrane.
Question 14
A xylem vessel has a diameter of 100 μm. If the vessel is filled with water at a pressure of 1 atm, what is the force exerted on the vessel wall?
A. 0.01
B. 0.1
C. 1.0
D. 10.0
Question 15
The diagram below shows a cross-section of the human kidney. Identify the structure labeled 'X' in the diagram.
A. Renal cortex
B. Renal medulla
C. Renal pelvis
D. Ureter

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