POST UTME MOUNTAIN TOP UNIVERSITY 2018 Biology | Objective

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Question 1
In a typical e\cosystem, what is the term for the process by which dead organisms are broken down and recycled?
A. Decomposition
B. Nutrient cycling
C. Primary production
D. Secondary production
Question 2
What is the primary function of the lysosomes in eukaryotic cells?
A. Protein synthesis
B. Cell signaling
C. Lipid synthesis
D. Cellular digestion and recycling
Question 3
What is the primary function of the mitochondria in eukaryotic cells?
A. Protein synthesis
B. Cell signaling
C. Lipid synthesis
D. Cellular respiration
Question 4
In a typical human diet, what is the primary source of energy?
A. Carbohydrates
B. Proteins
C. Fats
D. Fiber
Question 5
What is the primary function of the Golgi apparatus in eukaryotic cells?
A. Protein synthesis
B. Cell signaling
C. Lipid synthesis
D. Protein modification and transport
Question 6
In a typical xylem vessel, what is the primary function of the lignin component?
A. To provide structural support to the vessel
B. To facilitate the transport of water and minerals
C. To regulate the rate of transpiration
D. To prevent water loss through the cuticle
Question 7
In the context of respiration, what is the primary function of the mitochondria in the process of cellular respiration?
A. To produce ATP through the citric acid cycle
B. To generate NADH and FADH2 through glycolysis
C. To produce ATP through oxidative phosphorylation
D. To generate ATP through substrate-level phosphorylation
Question 8
A 10% solution of sodium chloride is prepared by dissolving 10 g of sodium chloride in 90 g of water. What is the concentration of the solution in terms of the number of moles of sodium chloride per liter of solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 5 M
Question 9
A plant with a C4 photosynthetic pathway has a higher water-use efficiency than a plant with a C3 photosynthetic pathway. What is the primary reason for this difference?
A. Higher stomatal density in C4 plants
B. Lower stomatal density in C4 plants
C. Higher CO2 fixation rates in C4 plants
D. Lower CO2 fixation rates in C4 plants
Question 10
A population of rabbits is growing exponentially. If the initial population size is 100 rabbits and the growth rate is 0.2 per year, what is the population size after 5 years?
A. 1000
B. 2000
C. 5000
D. 10000
Question 11
A diagram of the human heart is shown below. Identify the part labeled 'B'.
A. Atrium
B. Ventricle
C. Septum
D. Valve
Question 12
The classification of living organisms is based on which of the following characteristics?
A. Cell structure and function
B. Metabolism and energy production
C. Genetic makeup and evolution
D. All of the above
Question 13
A 30-year-old patient presents with symptoms of chronic kidney disease. Which of the following hormones is most likely to be deficient?
A. Erythropoietin (EPO)
B. Thyroid-stimulating hormone (TSH)
C. Adrenaline
D. Insulin
Question 14
In a typical e\cosystem, what is the primary role of decomposers in the nutrient cycle?
A. To synthesize organic compounds from inorganic subs\tances
B. To break down dead organisms and recycle nutrients
C. To produce oxygen through photosynthesis
D. To store energy in the form of ATP
Question 15
In the context of microorganisms and diseases, what is the primary function of the immune system in the body?
A. To produce antibodies to fight off pathogens
B. To activate the complement system to lyse pathogens
C. To activate macrophages to engulf and digest pathogens
D. To produce cytokines to recruit immune cells to the site of infection

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