POST UTME COVENANT UNIVERSITY 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A researcher is studying the effect of pH on the growth of Escherichia coli. The researcher measures the growth rate of the bacteria at different pH levels and obtains the following data: pH 5.5, growth rate 0.5; pH 6.0, growth rate 0.7; pH 6.5, growth rate 0.9. What is the best estimate of the growth rate at pH 7.0?
A. 1.1
B. 1.0
C. 0.9
D. 0.8
Question 2
The biotic factor that plays a crucial role in shaping the structure of an e\cosystem is
A. predation
B. competition
C. mutualism
D. symbiosis
Question 3
The hormone insulin plays a crucial role in glu\cose regulation by
A. stimulating glycogen synthesis
B. inhibiting gluconeogenesis
C. facilitating glu\cose uptake in cells
D. regulating lipolysis
Question 4
A diagram of a human eye is shown below. What is the function of the structure labeled 'Y'?
A. focu\sing light
B. detecting light
C. regulating light
D. absorbing light
Question 5
A plant has a photosynthetic rate of 10g CO2/h. If the plant is exposed to light for 8 hours, how much CO2 is fixed?
A. 80g CO2
B. 100g CO2
C. 120g CO2
D. 140g CO2
Question 6
In the context of digestion, what is the role of the pancreas?
A. Production of digestive enzymes
B. Production of bile
C. Production of hormones
D. Absorption of nutrients
Question 7
A diagram of the human brain is shown below. What is the function of the part labeled 'B'?
A. To control voluntary movements
B. To regulate body temperature
C. To process sensory information
D. To produce hormones
Question 8
The diagram below shows the structure of a plant cell. Which of the following is NOT a component of the plant cell?
A. Cell wall
B. Chloroplast
C. Mitochondrion
D. Ribosome
Question 9
The process of natural selection acts on
A. genetic variation within a population
B. environmental factors affecting a population
C. phenotypic traits of an individual
D. genetic drift in a population
Question 10
What is the primary function of the xylem in plants?
A. Transport of sugars and amino acids
B. Transport of water and minerals
C. Transport of gases
D. Transport of hormones
Question 11
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of
A. glu\cose
B. starch
C. cellulose
D. protein
Question 12
The process of mitosis in eukaryotic cells involves the division of the nucleus into two daughter nuclei, each containing the same number of
A. chromosomes
B. genes
C. ribosomes
D. mitochondria
Question 13
A 5.0 L container is filled with a mixture of 2.0 mol of O2 and 3.0 mol of CO2 at 25°C. What is the partial pressure of O2 in the container?
A. 0.25 atm
B. 0.50 atm
C. 0.75 atm
D. 1.00 atm
Question 14
The sense organ responsible for detecting changes in sound pressure is the
A. cochlea
B. stapes
C. tympanic membrane
D. auditory nerve
Question 15
A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.25 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, what is its angular frequency?
A. 10 rad/s
B. 20 rad/s
C. 5 rad/s
D. 15 rad/s

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