POST UTME OSUSTECH 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of the human respiratory system is shown below. Identify the part labeled 'B'.
A. Trachea
B. Lungs
C. Diaphragm
D. Bronchi
Question 2
A cell is placed in a solution with a pH of 4. The cell membrane is permeable to hydrogen ions. What will happen to the cell?
A. The cell will swell and eventually burst.
B. The cell will shrink and eventually die.
C. The cell will remain unchanged.
D. The cell will undergo mitosis.
Question 3
The excretory system in humans is primarily responsible for the removal of
A. Waste products and excess water
B. Excess salts and minerals
C. Carbon dioxide and lactic acid
D. Urea and creatinine
Question 4
A researcher is studying the process of digestion in the human body. Which of the following enzymes is responsible for breaking down proteins into smaller peptides?
A. Amylase
B. Lipase
C. Tryp\sin
D. Pep\sin
Question 5
A 2.0 g sample of a subs\tance is dissolved in 100 mL of water. If the osmotic pressure of the solution is 2.5 atm at 25°C, what is the molar mass of the subs\tance?
A. 50 g/mol
B. 75 g/mol
C. 100 g/mol
D. 125 g/mol
Question 6
A researcher is studying the structure of a particular tissue. Which of the following is a characteristic of a connective tissue?
A. Presence of a basement membrane
B. Presence of a network of blood vessels
C. Presence of a loose matrix
D. Presence of a dense matrix
Question 7
A plant's xylem tissue is responsible for transporting what subs\tance?
A. Water and minerals
B. Sugars and amino acids
C. Hormones and waste products
D. Gases and ions
Question 8
In the context of classification of living things, what is the primary function of the kingdom level?
A. To group organisms based on their genetic makeup
B. To categorize organisms based on their physical characteristics
C. To identify organisms based on their metabolic processes
D. To classify organisms based on their eco\logical niches
Question 9
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype 'aa'?
A. 0.04
B. 0.08
C. 0.16
D. 0.32
Question 10
A species of plant has a unique characteristic where its leaves are able to change color in response to changes in temperature. What type of adaptation is this?
A. Camouflage adaptation
B. Warning coloration adaptation
C. Thermoregulatory adaptation
D. Photoperiodic adaptation
Question 11
A 2.5-liter solution of a 3.0 M NaCl solution has a concentration of 9.0 grams per liter. What is the concentration of a 5.0 M NaCl solution?
A. 9
B. 15
C. 20
D. 25
Question 12
A 5% solution of glu\cose in water has a concentration of 5 grams per 100 milliliters. What is the concentration of a 10% solution of glu\cose in water?
A. 5
B. 10
C. 15
D. 20
Question 13
Asexual reproduction in plants can occur through the production of
A. Seeds
B. Spores
C. Buds
D. Rhizomes
Question 14
A species of animal has a unique characteristic where its body temperature remains cons\tant despite changes in the environment. What type of thermoregulation is this?
A. Endothermy
B. Ectothermy
C. Heterothermy
D. Poikilothermy
Question 15
In the context of respiratory physio\logy, what is the primary function of the parasympathetic nervous system in regulating breathing rate?
A. Increa\sing the rate of breathing
B. Decrea\sing the rate of breathing
C. Regulating the depth of breathing
D. Controlling the rate of gas exchange

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