POST UTME IGBINEDION UNIVERSITY 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A population of rabbits is growing exponentially. If the population size is 100 at time t=0 and 200 at time t=1 year, what is the growth rate (r) of the population?
A. 0.1
B. 0.2
C. 0.5
D. 1.0
Question 2
A researcher is studying the effect of temperature on the rate of photosynthesis in a plant. The graph below shows the relationship between temperature and rate of photosynthesis. What is the temperature at which the rate of photosynthesis is maximum?
A. 20°C
B. 25°C
C. 30°C
D. 35°C
Question 3
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
A. To focus light on the retina
B. To detect movement
C. To regulate pupil size
D. To produce tears
Question 4
A population of 1000 individuals has a mean height of 170 cm and a s\tandard deviation of 10 cm. What is the probability that a randomly selected individual will have a height between 160 cm and 180 cm?
A. 0.68
B. 0.84
C. 0.95
D. 0.99
Question 5
The xylem tissue in plants is responsible for
A. transporting water and minerals from the roots to the leaves
B. transporting sugars and amino acids from the leaves to the roots
C. producing auxins and cytokinins
D. regulating stomatal opening and clo\sing
Question 6
The process of photosynthesis in plants involves the conversion of light energy into chemical energy. Which of the following is a byproduct of photosynthesis?
A. Oxygen
B. Carbon dioxide
C. Water
D. Glu\cose
Question 7
In the context of sexual reproduction, what is the term for the process by which two alleles of a gene are separated during meiosis?
A. Genetic recombination
B. Gene mutation
C. Gene duplication
D. Gene deletion
Question 8
A diagram of a plant cell is shown below. What is the function of the part labeled 'B'?
A. To regulate water balance
B. To provide structural support
C. To synthesize proteins
D. To store genetic information
Question 9
A 50g sample of a subs\tance is dissolved in 100ml of water. What is the concentration of the solution in g/L?
A. 0.5
B. 1
C. 2
D. 5
Question 10
In the context of asexual reproduction, what is the primary mechanism by which genetic variation is introduced?
A. Mutation
B. Genetic recombination
C. Gene duplication
D. Gene deletion
Question 11
A patient has a hormonal imbalance that affects the regulation of blood sugar levels. The rate of glu\cose uptake is given by the equation \( \frac{dG}{dt} = rG left\( 1 - \frac{G}{K} \right \ \) ), where \( r = 0.3 \) and \( K = 100 \). If the initial glu\cose concentration is 10, find the glu\cose concentration after 10 time units.
A. 50
B. 75
C. 90
D. 100
Question 12
A 5-year-old child is diagnosed with a rare genetic disorder. The child's parents are both carriers of the recessive allele 'a'. What is the probability that the child will be affected by the disorder?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 13
A plant with the genotype AaBbCcc is crossed with a plant with the genotype AabbCC. What is the probability that the offspring will have the genotype AaBbCc?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 14
The nervous system of an organism is responsible for
A. regulating body temperature
B. controlling voluntary movements
C. transmitting nerve impulses
D. producing hormones
Question 15
In a population of 1000 individuals, 20% are heterozygous for a particular gene, while 10% are homozygous recessive. What is the frequency of the dominant allele?
A. 0.2
B. 0.3
C. 0.4
D. 0.5

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