POST UTME BELLS UNIVERSITY 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The process of photosynthesis occurs in specialized organelles called chloroplasts. Which of the following is a byproduct of photosynthesis?
A. Glu\cose
B. Oxygen
C. Carbon dioxide
D. Water
Question 2
A cell is placed in a hypotonic solution. What will happen to the cell?
A. The cell will shrink.
B. The cell will swell.
C. The cell will remain the same size.
D. The cell will burst.
Question 3
The process of mitosis results in the production of two daughter cells that are genetically identical to the parent cell. Which of the following stages of mitosis is responsible for the condensation of chromosomes?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 4
In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' for black body color is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'B'?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 5
The process of natural selection leads to the evolution of a population by favoring individuals with traits that enhance their ability to survive and reproduce in a given environment. Which of the following is a key consequence of this process?
A. Increased genetic variation within the population
B. Reduced genetic variation within the population
C. No change in genetic variation within the population
D. Increased genetic variation between populations
Question 6
A patient is suffering from a severe case of kidney failure. The patient's blood is being tested for the presence of waste products. The test results show that the patient's blood contains 10^3 milligrams per deciliter of urea. What is the concentration of the urea in the patient's blood?
A. 10^2
B. 10^3
C. 10^4
D. 10^5
Question 7
A 50-g sample of a mixture containing only sodium chloride and potassium nitrate is dissolved in 100 g of water. The resulting solution has a boiling point elevation of 0.5°C. What is the molar mass of the mixture?
A. 100 g/mol
B. 150 g/mol
C. 200 g/mol
D. 250 g/mol
Question 8
The process of mitosis results in the production of two daughter cells that are genetically identical to the parent cell. Which of the following stages of mitosis is responsible for the separation of the nuclear envelope?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 9
A cell in a plant root hair is surrounded by a sheath of cells that are rich in pectin. What is the primary function of this sheath?
A. To provide structural support to the root hair
B. To facilitate the absorption of water and minerals
C. To regulate the movement of ions and water into the root hair
D. To produce a barrier against pathogens
Question 10
A diagram of a plant cell is shown below. Which of the following organelles is responsible for the synthesis of proteins?
A. Nucleus
B. Mitochondria
C. Ribosome
D. Endoplasmic reticulum
Question 11
A researcher is studying the effect of pH on the growth of E. coli bacteria. The bacteria are grown in a controlled environment, and their growth is measured over time. The data is shown below. What is the optimal pH for the growth of the bacteria?
A. 6
B. 7
C. 8
D. 9
Question 12
The process of cellular respiration involves the breakdown of glu\cose to produce ATP, which is then used to power the cell's various activities. Which of the following is a byproduct of glycolysis?
A. Pyruvate
B. Lactic acid
C. Ethanol
D. Carbon dioxide
Question 13
A diagram of the human digestive system is shown below. Which organ is labeled 'B'?
A. Stomach
B. Small intestine
C. Large intestine
D. Liver
Question 14
In a typical e\cosystem, what is the primary function of decomposers?
A. To produce organic compounds from inorganic subs\tances
B. To break down dead organisms and recycle nutrients
C. To produce oxygen through photosynthesis
D. To regulate water potential
Question 15
A researcher is studying the effect of temperature on the growth of a microorganism. Which of the following temperatures would be most likely to result in the highest growth rate?
A. 20°C
B. 30°C
C. 40°C
D. 50°C

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