POST UTME UNIBEN 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The process by which plants convert light energy into chemical energy is
A. Respiration
B. Photosynthesis
C. Transpiration
D. Translocation
Question 2
The equation below represents the rate of respiration in a cell. What is the value of x in the equation?
A. 2
B. 3
C. 4
D. 5
Question 3
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
A. to focus light
B. to detect light
C. to re\fract light
D. to absorb light
Question 4
The process by which an organism's genetic information is passed from one generation to the next is known as
A. Heritability
B. Genetic variation
C. Gene expression
D. Epigenetics
Question 5
A plant has a photosynthetic rate of 10 μmol CO2/s. If the light intensity is increased by a factor of 2, what is the new photosynthetic rate?
A. 5 μmol CO2/s
B. 10 μmol CO2/s
C. 15 μmol CO2/s
D. 20 μmol CO2/s
Question 6
The enzyme catalase breaks down hydrogen peroxide into water and oxygen. If 10 mL of 3% hydrogen peroxide is treated with 1 g of catalase, what is the volume of oxygen gas produced at STP?
A. 1.5 mL
B. 2.8 mL
C. 4.2 mL
D. 5.6 mL
Question 7
In a tropical rainforest e\cosystem, what is the primary role of the leaf's cuticle in relation to transpiration?
A. To reduce water loss through transpiration
B. To increase water uptake through root absorption
C. To facilitate gas exchange between the leaf and the atmosphere
D. To protect the leaf from excessive sunlight
Question 8
A population of bacteria grows according to the \logistic growth equation: dP/dt = rP\( 1 - P/K \). If the initial population is 100 and the carrying capacity is 1000, what is the population size after 10 generations?
A. 500
B. 750
C. 900
D. 950
Question 9
The graph below shows the relationship between the concentration of a subs\tance and its rate of diffusion. What is the name of the process represented by the graph?
A. Osmosis
B. Diffusion
C. Active Transport
D. Passive Transport
Question 10
A cell in the G2 phase of the cell cycle has a DNA content of 8C. If the cell proceeds to mitosis, what will be the DNA content of the daughter cells?
A. 2C
B. 4C
C. 8C
D. 16C
Question 11
A diagram of a human digestive system is shown below. What is the function of the structure labeled 'Z'?
A. To break down proteins into amino acids
B. To absorb nutrients into the bloodstream
C. To store water and nutrients
D. To regulate electrolyte balance
Question 12
A person with a genetic disorder has a mutation in the gene that codes for a protein. Which of the following is a possible consequence of this mutation?
A. The protein is produced in excess
B. The protein is produced in deficiency
C. The protein is produced with a change in function
D. The protein is not produced at all
Question 13
A diagram of the human nervous system is shown below. Identify the structure labeled 'D'?
A. Brain
B. Spinal Cord
C. Nerves
D. Sensory Receptors
Question 14
A diagram shows a plant with 5 petals. If the plant is a heterozygous for the gene controlling petal number, what is the probability that the offspring will have 5 petals?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 15
A diagram of the human circulatory system is shown below. Which part of the circulatory system is responsible for transporting oxygenated blood from the lungs to the heart?
A. Pulmonary Veins
B. Aorta
C. Pulmonary Arteries
D. Coronary Arteries

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