POST UTME COVENANT UNIVERSITY 2019 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A patient is diagnosed with a rare genetic disorder that affects the production of melanin. The pedigree chart below shows the inheri\tance pattern of the disorder.
A. The disorder is inherited in an autosomal dominant pattern.
B. The disorder is inherited in an autosomal recessive pattern.
C. The disorder is inherited in an X-linked dominant pattern.
D. The disorder is inherited in an X-linked recessive pattern.
Question 2
In a forest e\cosystem, the presence of a dominant species can lead to a phenomenon known as "keystone" predation. Which of the following best describes the role of a keystone predator in its e\cosystem?
A. A keystone predator is a species that has a disproportionate impact on its environment, often controlling prey populations and maintaining e\cosystem diversity.
B. A keystone predator is a species that is highly specialized and plays a crucial role in the survival of other species in its e\cosystem.
C. A keystone predator is a species that is highly adaptable and can thrive in a variety of environments.
D. A keystone predator is a species that is highly competitive and can outcompete other species for resources.
Question 3
In a closed e\cosystem, the rate of photosynthesis is directly proportional to the rate of respiration. If the rate of photosynthesis is 10 units per hour, and the rate of respiration is 8 units per hour, what is the net rate of oxygen production per hour?
A. 1 unit/hour
B. 2 units/hour
C. 3 units/hour
D. 4 units/hour
Question 4
A patient is diagnosed with a bacterial infection. Which of the following antibiotics is most likely to be prescribed?
A. Penicillin
B. Tetracycline
C. Ciprofloxacin
D. Vancomycin
Question 5
In the context of evolutionary theory, what is the term for the process by which a species becomes better adapted to its environment over time?
A. Natural selection
B. Genetic drift
C. Mutation
D. Gene flow
Question 6
The sense organ responsible for detecting changes in air pressure is the?
A. Eustachian tube
B. Middle ear
C. Inner ear
D. Labyrinth
Question 7
The genetic variation in a population is maintained by the Hardy-Weinberg principle, which states that the allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary forces. What is the primary assumption of the Hardy-Weinberg principle?
A. Random mating
B. No mutation
C. No gene flow
D. All of the above
Question 8
The xylem is a type of vascular tissue in plants that is responsible for transporting water and minerals from the roots to the leaves. Which of the following is a characteristic of xylem tissue?
A. It is composed of dead cells
B. It is composed of living cells
C. It is responsible for transporting sugars from the leaves to the roots
D. It is responsible for transporting water and minerals from the roots to the leaves
Question 9
A researcher is studying the effect of temperature on the growth of a microorganism. The graph below shows the growth of the microorganism at different temperatures.
A. The optimal temperature for growth is 25°C.
B. The optimal temperature for growth is 30°C.
C. The optimal temperature for growth is 35°C.
D. The optimal temperature for growth is 40°C.
Question 10
The process of excretion in humans involves the removal of waste products from the body. Which of the following is a critical component of the excretory system?
A. Kidneys
B. Liver
C. Pancreas
D. Small intestine
Question 11
The classification of living things is based on their characteristics and evolutionary relationships. Which of the following is a domain of life?
A. Archaea
B. Bacteria
C. Eukarya
D. All of the above
Question 12
A patient is diagnosed with a rare genetic disorder that affects the production of melanin. The pedigree chart below shows the inheri\tance pattern of the disorder.
A. The disorder is inherited in an autosomal dominant pattern.
B. The disorder is inherited in an autosomal recessive pattern.
C. The disorder is inherited in an X-linked dominant pattern.
D. The disorder is inherited in an X-linked recessive pattern.
Question 13
In a tropical rainforest e\cosystem, what is the primary role of the leafy canopy in the nutrient cycle?
A. To absorb and store nutrients from the soil
B. To release nutrients into the soil through leaf litter
C. To facilitate the movement of nutrients between trophic levels
D. To regulate the amount of sunlight reaching the forest floor
Question 14
A 50 g sample of a subs\tance is dissolved in 100 mL of water. If the subs\tance has a molar mass of 200 g/mol, and the concentration of the solution is 0.5 M, what is the number of moles of the subs\tance in the solution?
A. 0.025 mol
B. 0.05 mol
C. 0.075 mol
D. 0.1 mol
Question 15
A researcher is studying the effect of pH on the growth of E. coli. The graph below shows the growth of E. coli at different pH levels.
A. The optimal pH for growth is 7.
B. The optimal pH for growth is 9.
C. The optimal pH for growth is 11.
D. The optimal pH for growth is 13.

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