POST UTME VERITAS UNIVERSITY 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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
B. 40 μmol CO2 s-1
C. 50 μmol CO2 s-1
D. 60 μmol CO2 s-1
Question 2
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
C. To pump protons across the mitochondrial membrane, creating a proton gradient
D. To convert glu\cose into pyruvate through glycolysis
Question 3
A genetic variation occurs when there is a change in the DNA sequence of an organism. Which of the following is an example of a genetic variation?
A. A change in the number of chromosomes.
B. A change in the DNA sequence of a gene.
C. A change in the expression of a gene.
D. A change in the environment.
Question 4
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
C. 2.0 μL/min
D. 2.5 μL/min
Question 5
In a eukaryotic cell, the process of photosynthesis occurs in the mitochondria. Which of the following statements is correct about the mitochondria?
A. The mitochondria is the site of protein synthesis.
B. The mitochondria is the site of cellular respiration.
C. The mitochondria is the site of cell division.
D. The mitochondria is the site of DNA replication.
Question 6
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
D. 1050
Question 7
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
D. 10
Question 8
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
D. Integumentary system
Question 9
In a tropical rainforest e\cosystem, what is the primary role of the decomposer population?
A. To produce organic compounds through photosynthesis
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
Question 10
In a population of rabbits, what is the relationship between the carrying capacity and the population growth rate?
A. Inversely proportional
B. Directly proportional
C. No relationship
D. Indirectly proportional
Question 11
The diagram below represents a cross-section of the human eye. Which part of the eye is responsible for adjusting the size of the pupil?
A. A
B. B
C. C
D. D
Question 12
A population of rabbits is introduced to a new island. The population grows exponentially, with a growth rate of 20% per year. If the initial population is 100 rabbits, what is the population size after 5 years?
A. 1610
B. 1620
C. 1630
D. 1640
Question 13
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
C. 600 N
D. 650 N
Question 14
A tissue is composed of a group of cells that perform a specific function. Which of the following is an example of a tissue?
A. A group of nerve cells in the brain.
B. A group of muscle cells in the heart.
C. A group of epithelial cells in the skin.
D. A group of connective tissue cells in the bone.
Question 15
A plant has a circadian rhythm that regulates its photosynthetic activity. The rhythm is controlled by a specific gene that codes for a protein that regulates the expression of other genes involved in photosynthesis. If the gene is mutated, what is the likely effect on the plant's photosynthetic activity?
A. Increased photosynthetic activity
B. Decreased photosynthetic activity
C. No effect on photosynthetic activity
D. Increased growth rate

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