POST UTME VERITAS UNIVERSITY 2023 Biology | Objective

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Question 1 View Details
In a closed e\cosystem, what is the net effect of the decomposition of organic matter on the nutrient cycle?
Correct A. Increase in nutrient availability
B. Decrease in nutrient availability
C. No effect on nutrient availability
D. Increase in nutrient immobilization

Correct Answer: A

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Question 2 View Details
In a plant cell, what is the primary function of the vacuole?
Correct A. Storage of water and nutrients
B. Regulation of cell turgor pressure
C. Production of cell wall components
D. Synthesis of proteins

Correct Answer: A

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Question 3 View Details
In a population of rabbits, what is the relationship between the carrying capacity and the population growth rate?
Correct A. Inversely proportional
B. Directly proportional
C. No relationship
D. Indirectly proportional

Correct Answer: A

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Question 4 View Details
In a human body, what is the primary function of the xylem in the vascular system?
Correct A. Transport of oxygen and nutrients
B. Transport of carbon dioxide and waste
C. Production of hormones
D. Regulation of body temperature

Correct Answer: A

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Question 5 View Details
In a photosynthetic process, what is the role of the electron transport chain?
Correct A. Production of ATP and NADPH
B. Regulation of stomatal opening
C. Synthesis of glu\cose
D. Decomposition of organic matter

Correct Answer: A

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Question 6 View Details
In the context of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
B. To produce NADH and FADH2 from the citric acid cycle
Correct C. To pump protons across the mitochondrial membrane, creating a proton gradient
D. To convert glu\cose into pyruvate through glycolysis

Correct Answer: C

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Question 7 View Details
A population of Drosophila melanogaster is being studied for its genetic variation. Which of the following genetic traits is an example of a polygenic trait?
A. Eye color
Correct B. Wing length
C. Body color
D. Eye shape

Correct Answer: B

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Question 8 View Details
In a tropical rainforest e\cosystem, what is the primary role of the decomposer population?
A. To produce organic compounds through photosynthesis
Correct B. To break down dead plant and animal matter into simpler compounds
C. To form symbiotic relationships with other organisms
D. To regulate the water cycle

Correct Answer: B

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Question 9 View Details
The human eye has a unique structure that allows it to detect light and color. Which of the following is a characteristic of the human eye's photoreceptors?
A. They are sensitive to only one type of light
Correct B. They are sensitive to a wide range of light frequencies
C. They are responsible for transmitting visual signals to the brain
D. They are responsible for regulating the eye's focus

Correct Answer: B

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Question 10 View Details
The human body is composed of various systems that work together to maintain homeostasis. Which of the following systems is responsible for regulating body temperature?
A. Nervous system
B. Circulatory system
C. Respiratory system
Correct D. Integumentary system

Correct Answer: D

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Question 11 View Details
In a population of 1000 bacteria, 80% are in the exponential growth phase. If the growth rate is 2.5% per hour, what is the expected number of bacteria after 5 hours?
A. 900
B. 950
C. 1000
Correct D. 1050

Correct Answer: D

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Question 12 View Details
A 2.5-liter solution of 0.5 M NaCl is mixed with a 1.5-liter solution of 0.2 M NaCl. What is the resulting concentration of NaCl?
A. 0.3 M
B. 0.35 M
Correct C. 0.4 M
D. 0.45 M

Correct Answer: C

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Question 13 View Details
A 50-kg person is s\tanding on a scale in an elevator. If the elevator accelerates upward at 2 m/s^2, what is the reading on the scale?
A. 500 N
B. 550 N
Correct C. 600 N
D. 650 N

Correct Answer: C

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Question 14 View Details
A 0.5-μm diameter bacterium is placed in a 1-μm diameter capillary tube. What is the expected flow rate of a 0.01 M NaCl solution through the capillary tube?
A. 1.0 μL/min
B. 1.5 μL/min
Correct C. 2.0 μL/min
D. 2.5 μL/min

Correct Answer: C

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Question 15 View Details
A 100-μm diameter blood vessel has a pressure of 100 mmHg. What is the expected flow rate of blood through the vessel?
A. 1.0 mL/min
B. 1.5 mL/min
Correct C. 2.0 mL/min
D. 2.5 mL/min

Correct Answer: C

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Question 16 View Details
In a population of 1000 bacteria, 80% are susceptible to antibiotic treatment, 15% are resis\tant, and 5% are in a dormant state. If 200 bacteria are treated with an antibiotic, what is the expected number of bacteria that will be killed?
Correct A. 120
B. 150
C. 180
D. 200

Correct Answer: A

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Question 17 View Details
A cell in interphase has a DNA content of 2C. If the cell enters mitosis and undergoes one round of DNA replication, what will be the DNA content of the daughter cells?
A. 2C
Correct B. 4C
C. 8C
D. 16C

Correct Answer: B

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Question 18 View Details
A plant has a xylem sap concentration of 10% glu\cose. If 100 mL of sap is collected, what is the mass of glu\cose in grams?
A. 10g
Correct B. 20g
C. 30g
D. 40g

Correct Answer: B

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Question 19 View Details
A neuron has a resting membrane potential of -70 mV. If the membrane potential becomes depolarized to -50 mV, what is the percentage change in membrane potential?
A. 10%
B. 20%
C. 30%
Correct D. 40%

Correct Answer: D

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Question 20 View Details
A plant hormone has a half-life of 2 hours. If 100 mg of the hormone is applied to a plant, what is the mass of the hormone remaining after 4 hours?
Correct A. 25mg
B. 50mg
C. 75mg
D. 100mg

Correct Answer: A

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Question 21 View Details
In a population of 1000 bacteria, 80% are in the exponential growth phase. If the growth rate is 2% per hour, how many bacteria will be in the exponential growth phase after 5 hours?
A. 800
Correct B. 900
C. 1000
D. 1200

Correct Answer: B

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Question 22 View Details
A 2.5 L solution of 0.5 M NaCl is diluted to 5 L. What is the new concentration of NaCl?
A. 0.1 M
B. 0.2 M
Correct C. 0.25 M
D. 0.5 M

Correct Answer: C

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Question 23 View Details
A plant has a photosynthetic rate of 10 μmol CO2 s-1. If the light intensity is increased by a factor of 4, what is the new photosynthetic rate?
A. 20 μmol CO2 s-1
Correct B. 40 μmol CO2 s-1
C. 50 μmol CO2 s-1
D. 60 μmol CO2 s-1

Correct Answer: B

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Question 24 View Details
A 50 mL sample of a 0.1 M solution of NaOH is titrated with 0.1 M HCl. What is the pH of the solution after the titration?
A. 7
B. 8
C. 9
Correct D. 10

Correct Answer: D

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Question 25 View Details
A 5 L solution of 0.5 M glu\cose is diluted to 10 L. What is the new concentration of glu\cose?
A. 0.1 M
B. 0.2 M
Correct C. 0.25 M
D. 0.5 M

Correct Answer: C

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