POST UTME OAU 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 5.0 g sample of a subs\tance is found to have a mass of 2.5 g when susp\ended in water. What is the density of the subs\tance?
A. 0.5 g/mL
B. 1.0 g/mL
C. 2.0 g/mL
D. 5.0 g/mL
Question 2
The process of asexual reproduction in which a \single organism produces offspring that are genetically identical to itself is known as:
A. Mitosis
B. Meiosis
C. Budding
D. Binary Fission
Question 3
A plant with the genotype AABB has a cross with a plant with the genotype aabb. What is the probability that the offspring will have the genotype Aa?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 4
A 0.5-mole sample of carbon dioxide gas is collected over water at 25°C and 1 atm. If the partial pressure of water vapor is 23.8 torr, what is the mole \fraction of carbon dioxide?
A. 0.97
B. 0.98
C. 0.99
D. 0.995
Question 5
In a population of 1000 bacteria, 80% are resis\tant to antibiotic A. If 200 bacteria are randomly selected for treatment, what is the probability that at least 150 will be resis\tant to antibiotic A?
A. 0.95
B. 0.80
C. 0.60
D. 0.40
Question 6
A 2.5-metre-tall tree is observed to cast a shadow of 1.8 metres. At the same time, a nearby building casts a shadow of 4.2 metres. What is the height of the building?
A. 6.0
B. 8.1
C. 10.5
D. 12.6
Question 7
The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation in the absence of certain factors. Which of the following is NOT one of the factors that can cause a change in allele frequency?
A. Mutation
B. Gene flow
C. Genetic drift
D. Natural selection
Question 8
The nervous system in humans is responsible for coordinating:
A. Voluntary movements
B. Involuntary movements
C. Sensory information
D. All of the above
Question 9
A diagram of a human reproductive system is shown below. What is the primary function of the part labeled 'C'?
A. To produce sperm
B. To produce eggs
C. To store sperm
D. To regulate hormone production
Question 10
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 7
D. 14
Question 11
A 2.0 L flask contains 0.50 M NaCl. If 0.20 M CaCl2 is added to the flask, what is the new concentration of NaCl?
A. 0.30 M
B. 0.40 M
C. 0.50 M
D. 0.60 M
Question 12
A diagram of a plant's xylem is shown below. What is the primary function of the part labeled 'B'?
A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the rest of the plant
C. To store water and nutrients
D. To regulate gas exchange
Question 13
The xylem tissue in plants is responsible for transporting:
A. Water and minerals
B. Sugars and amino acids
C. Hormones and waste products
D. Oxygen and carbon dioxide
Question 14
The process of genetic drift in a population can lead to the loss of genetic variation over time. Which of the following is a consequence of genetic drift?
A. Increased genetic variation
B. Decreased genetic variation
C. No change in genetic variation
D. Increased mutation rate
Question 15
In a e\cosystem, what is the term for the process by which plants convert light energy from the sun into chemical energy in the form of glu\cose?
A. Respiration
B. Photosynthesis
C. Decomposition
D. Fermentation

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