POST UTME MADONNA UNIVERSITY 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of the human respiratory system is shown below. What is the function of the part labeled 'C'?
A. To exchange oxygen and carbon dioxide
B. To regulate breathing rate
C. To produce mucus
D. To detect odors
Question 2
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. 0.72
D. 0.84
Question 3
A 35-year-old woman presents to her gyneco\logist with a history of irregular menstrual cycles, infertility, and pelvic pain. What is the most likely diagnosis?
A. Polycystic ovary syndrome (PCOS)
B. Endometriosis
C. Fibroids
D. Ovarian cancer
Question 4
A diagram of the human circulatory system is shown below. What is the function of the part labeled 'B'?
A. To pump blood to the lungs
B. To pump blood to the body
C. To regulate blood pressure
D. To produce blood cells
Question 5
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype?
A. 0.36
B. 0.64
C. 0.16
D. 0.04
Question 6
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. 0.16
D. 0.04
Question 7
In the context of cellular respiration, what is the role of the electron transport chain?
A. To generate ATP
B. To produce NADH and FADH2
C. To oxidize glu\cose
D. To reduce oxygen
Question 8
A plant's root system is composed of a taproot and a network of smaller roots. What is the primary function of the taproot?
A. To anchor the plant in the soil
B. To absorb water and nutrients from the soil
C. To store food for the plant
D. To produce flowers and seeds
Question 9
In the xylem transport system, what is the primary function of the xylem parenchyma cells?
A. To store water and minerals
B. To produce xylem sap
C. To transport xylem sap
D. To regulate water potential
Question 10
A 45-year-old man is brought to the emergency room with a history of chest pain, shortness of breath, and a heart rate of 120 beats per minute. What is the most likely diagnosis?
A. Myocardial infarction
B. Pulmonary embolism
C. Aortic dissection
D. Cardiac tamponade
Question 11
What is the primary difference between the prokaryotic and eukaryotic cells?
A. The presence of a nucleus
B. The absence of a cell wall
C. The presence of mitochondria
D. The absence of a Golgi apparatus
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 50 g sample of a subs\tance has a mass of 25 g after being dried in an oven at 105°C for 24 hours. What is the percentage of water in the sample?
A. 25
B. 50
C. 75
D. 90
Question 14
A 5.0 L flask contains 0.2 M NaOH. What is the concentration of OH- ions in the solution?
A. 0.01
B. 0.02
C. 0.04
D. 0.08
Question 15
A researcher is studying the effect of temperature on the growth of a microorganism. The graph below shows the growth rate of the microorganism at different temperatures. What is the temperature at which the growth rate is maximum?
A. 25°C
B. 30°C
C. 35°C
D. 40°C

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