POST UTME EKSU 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A plant has a genetic trait that is controlled by a \single gene with two alleles. The dominant allele 'A' codes for tall plants, while the recessive allele 'a' codes for short plants. If a plant with tall plants is crossed with a plant with short plants, what is the probability that the offspring will have short plants?
A. 0.25
B. 0.50
C. 0.75
D. 0.90
Question 2
A 40-year-old man presents with a 10-year history of progressive shortness of breath. His physical examination reveals a loud, harsh, and mid-systolic ejection murmur. What is the most likely diagnosis?
A. Aortic stenosis
B. Mitral stenosis
C. Tricuspid stenosis
D. Pulmonary stenosis
Question 3
A patient presents with symptoms of a bacterial infection. Which of the following microorganisms is most likely responsible for the infection, given that the patient has a compromised immune system?
A. Staphylococcus aureus
B. Escherichia coli
C. Pseudomonas aeruginosa
D. Klebsiella pneumoniae
Question 4
A cell in interphase has a DNA content of 2C. If the cell undergoes mitosis, what will be the DNA content of the daughter cells?
A. 2C
B. 4C
C. 6C
D. 8C
Question 5
The process of digestion involves the breakdown of food into smaller molecules that can be absorbed and utilized by the body. Which of the following enzymes is responsible for breaking down proteins?
A. Amylase
B. Lipase
C. Protease
D. Lactase
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. 0.72
D. 0.80
Question 7
A diagram of the human digestive system is shown below. What is the primary function of the pancreas?
A. Digestion of carbohydrates
B. Digestion of proteins
C. Digestion of fats
D. Production of digestive enzymes
Question 8
The process of cellular respiration involves the breakdown of glu\cose to produce ATP, which is then used to power the cell's various activities. Which of the following statements about the electron transport chain is FALSE?
A. The electron transport chain is the site of oxidative phosphorylation.
B. The electron transport chain is located in the mitochondria.
C. The electron transport chain is responsible for generating the proton gradient.
D. The electron transport chain is the site of substrate-level phosphorylation.
Question 9
A patient is experiencing respiratory distress due to a severe case of pneumonia. Which of the following medications would be most effective in relieving the symptoms?
A. Antibiotics
B. Corti\costeroids
C. Antihistamines
D. Expectorants
Question 10
A diagram of a human eye is shown below. What is the primary function of the lens in this eye?
A. To focus light on the retina
B. To scatter light and reduce glare
C. To absorb excess light and prevent damage
D. To transmit signals to the brain
Question 11
A plant has a genetic trait that is controlled by a \single gene with two alleles. The dominant allele 'A' codes for red flowers, while the recessive allele 'a' codes for white flowers. If a plant with red flowers is crossed with a plant with white flowers, what is the probability that the offspring will have red flowers?
A. 0.25
B. 0.50
C. 0.75
D. 0.90
Question 12
A 35-year-old man presents with a 5-year history of progressive dysphagia. His physical examination reveals a large, hard, and fixed mass in the upper esophagus. What is the most likely diagnosis?
A. Esophageal carcinoma
B. Esophageal stricture
C. Esophageal diverticulum
D. Esophageal varices
Question 13
A diagram of the human respiratory system is shown below. What is the primary function of the alveoli?
A. Gas exchange
B. Air filtration
C. Humidity regulation
D. Temperature regulation
Question 14
In a tropical rainforest e\cosystem, what is the primary role of the emergent layer in relation to the forest's energy balance?
A. To absorb and store excess energy from the sun
B. To reflect and scatter sunlight to maintain a stable temperature
C. To facilitate the exchange of gases between the forest and the atmosphere
D. To provide structural support for the forest canopy
Question 15
In the context of osmoregulation, what is the primary function of the kidneys in a desert-dwelling organism?
A. To conserve water by reabsorbing water from the filtrate
B. To excrete excess salt by producing a highly concentrated urine
C. To regulate electrolyte balance by adjusting the amount of ions in the urine
D. To maintain acid-base balance by adjusting the pH of the urine

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