POST UTME AL-HIKMAH UNIVERSITY 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A plant is placed in a growth chamber with a temperature of 25°C and a photoperiod of 12 hours. After 10 days, the plant has grown to a height of 20 cm. What is the rate of growth of the plant?
A. 0.5 cm/day
B. 1.0 cm/day
C. 1.5 cm/day
D. 2.0 cm/day
Question 2
A researcher is studying the effect of pH on the growth of a microorganism. What is the primary mechanism by which pH affects microorganism growth?
A. Denaturation of proteins
B. Inhibition of enzyme activity
C. Disruption of cell membrane
D. Inhibition of nutrient uptake
Question 3
In the context of evolutionary theory, what is the primary mechanism by which natural selection acts on a population?
A. Genetic drift
B. Gene flow
C. Mutation
D. Differential reproduction
Question 4
In the context of asexual reproduction, what is the primary advantage of budding in yeast?
A. It allows for the production of multiple offspring at once
B. It increases the genetic diversity of the offspring
C. It is a more efficient method of reproduction than sexual reproduction
D. It allows for the production of offspring with unique characteristics
Question 5
A 50 mL sample of a solution containing 0.1 M NaCl is added to 100 mL of water. What is the concentration of NaCl in the resulting solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 6
A species of bird has a beak shape that is well-suited for cracking open nuts. This is an example of what type of adaptation?
A. Mimicry
B. Camouflage
C. Specialized
D. Generalized
Question 7
A population of rabbits is growing exponentially. If the initial population is 100 and the growth rate is 20% per year, what will be the population after 5 years?
A. 1000
B. 2000
C. 4000
D. 8000
Question 8
The xylem is responsible for transporting water and minerals from the roots to the leaves of a plant. What is the primary function of the xylem?
A. Transporting water and minerals
B. Producing glu\cose through photosynthesis
C. Storing food for the plant
D. Regulating the plant's temperature
Question 9
In a population of 1000 bacteria, 50% are resis\tant to antibiotic X. If 200 bacteria are randomly selected and treated with antibiotic X, what is the probability that at least 80 bacteria are resis\tant to the antibiotic?
A. 0.2
B. 0.3
C. 0.4
D. 0.5
Question 10
A species of plant has a genetic trait that determines its flower color. The trait is controlled by a \single gene with two alleles: F (red flowers) and f (white flowers). The genotype of a plant can be FF, Ff, or ff. If the frequency of the F allele is 0.6, what is the probability that a plant chosen at random will have white flowers?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 11
In the context of osmoregulation, what is the primary function of the hypothalamus in regulating thirst and hunger?
A. To regulate the balance of electrolytes in the body
B. To stimulate the release of hormones that control thirst and hunger
C. To monitor the concentration of solutes in the blood
D. To regulate the body's water balance
Question 12
In the context of respiration, what is the primary function of the enzyme cytochrome c oxidase?
A. To catalyze the conversion of pyruvate to acetyl-CoA
B. To facilitate the transfer of electrons from NADH to oxygen
C. To regulate the activity of the citric acid cycle
D. To synthesize ATP from ADP and Pi
Question 13
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is a byproduct of this process?
A. Oxygen
B. Carbon dioxide
C. Nitrogen
D. Water
Question 14
A species of plant has a life cycle that includes both asexual and sexual reproduction. Which of the following is a characteristic of asexual reproduction?
A. It involves the production of spores.
B. It involves the fusion of gametes.
C. It results in offspring that are genetically identical to the parent.
D. It requires a mate.
Question 15
A 2.5 L solution of 0.1 M glu\cose is diluted to 5 L. What is the concentration of glu\cose in the new solution?
A. 0.02 M
B. 0.04 M
C. 0.05 M
D. 0.1 M

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