POST UTME MADONNA UNIVERSITY 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 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 patient has a blood type of O and a Rh factor of negative. If the patient receives a blood transfusion from a donor with a blood type of A and a Rh factor of positive, what is the likelihood of an adverse reaction?
A. 0%
B. 25%
C. 50%
D. 75%
Question 4
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 5
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 6
A population of bacteria is growing exponentially. Which of the following is a characteristic of exponential growth?
A. A cons\tant rate of growth
B. A decrea\sing rate of growth
C. A increa\sing rate of growth
D. No growth
Question 7
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 recessive genotype 'aa'?
A. 0.04
B. 0.16
C. 0.36
D. 0.64
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 dominant allele 'A'?
A. 0.8
B. 0.6
C. 0.4
D. 0.2
Question 9
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 10
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 11
The process of natural selection leads to the evolution of a population of organisms over time. Which of the following is a consequence of this process?
A. Increased genetic variation
B. Decreased genetic variation
C. No change in genetic variation
D. Increased genetic drift
Question 12
A solution of 0.1 M NaCl is diluted to 0.01 M. What is the new concentration of Na+ ions?
A. 0.005
B. 0.01
C. 0.02
D. 0.05
Question 13
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 14
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 15
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

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