POST UTME BELLS UNIVERSITY 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1500 mL sample of a solution containing 0.1 M NaCl is diluted to a total volume of 3000 mL. What is the concentration of NaCl in the final solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 2
Asexual reproduction in plants can occur through the production of adventitious roots. What is the primary advantage of this type of reproduction?
A. Increased genetic diversity
B. Faster growth rates
C. Improved resis\tance to disease
D. Reduced energy exp\enditure
Question 3
The theory of evolution by natural selection was first proposed by Charles Darwin in his book 'On the Origin of Species'. Which of the following is a key concept of this theory?
A. Survival of the fittest
B. Species adaptation
C. Genetic drift
D. Gene flow
Question 4
In the context of excretion, what is the primary function of the kidneys?
A. Regulation of blood pressure
B. Regulation of electrolyte balance
C. Removal of waste products from the blood
D. Production of hormones
Question 5
In a desert e\cosystem, the primary consumers are primarily insects and small reptiles. Which of the following is a characteristic of these organisms?
A. They have a high metabolic rate to cope with the hot temperatures.
B. They have a low metabolic rate to conserve energy.
C. They are primarily herbivores.
D. They are primarily carnivores.
Question 6
In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is mediated by the action of which of the following proteins?
A. Lamin B
B. Histone H2B
C. Conden\sin
D. Topoisomerase II
Question 7
In the human body, what is the primary function of the xylem?
A. Transport of oxygen to the lungs
B. Transport of nutrients to the cells
C. Transport of water and minerals to the roots
D. Transport of waste products to the kidneys
Question 8
The process of digestion in the human body involves the breakdown of food into smaller molecules that can be absorbed and utilized by the body. Which of the following enzymes is responsible for breaking down proteins?
A. Amylase
B. Lipase
C. Tryp\sin
D. Lactase
Question 9
A 5-mL sample of 0.2 M HCl is added to a 20-mL sample of 0.1 M NaOH in a burette. If the initial burette reading is 10.0 mL, what is the final burette reading?
A. 12.0
B. 15.0
C. 18.0
D. 20.0
Question 10
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'rr'. What is the probability that the offspring will have the genotype 'Rr'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 11
The xylem in plants is responsible for transporting water and minerals from the roots to the leaves. Which of the following is a characteristic of xylem tissue?
A. It is composed of dead cells
B. It is responsible for transporting sugars
C. It is composed of living cells
D. It is responsible for transporting water and minerals
Question 12
A diagram of the human respiratory system is shown below. Which of the following structures is responsible for the exchange of oxygen and carbon dioxide?
A. The trachea
B. The bronchi
C. The alveoli
D. The diaphragm
Question 13
In a tropical rainforest e\cosystem, what is the primary mechanism by which nutrients are cycled between organisms?
A. Decomposition
B. Photosynthesis
C. Respiration
D. Transpiration
Question 14
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'rr'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 15
In the context of hormonal coordination, what is the primary function of the hypothalamus?
A. Regulation of body temperature
B. Regulation of hunger and thirst
C. Regulation of hormone secretion
D. Regulation of sleep-wake cycle

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