POST UTME UI 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype 'aa'?
A. 0.04
B. 0.08
C. 0.16
D. 0.32
Question 2
A diagram of the human eye is shown below. What is the function of the part labeled 'C'?
A. To focus light onto the retina
B. To re\fract light entering the eye
C. To detect light intensity
D. To regulate pupil size
Question 3
A plant cell is placed in a solution with a high concentration of sucrose. Which of the following processes will occur in the cell?
A. Osmosis
B. Diffusion
C. Active transport
D. Passive transport
Question 4
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' for red eyes is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'R'?
A. 0.8
B. 0.6
C. 0.4
D. 0.2
Question 5
In a typical xylem vessel, what is the primary function of the lignin in the secondary cell wall?
A. To provide structural support to the vessel
B. To facilitate the transport of water and minerals
C. To regulate the rate of water uptake by the roots
D. To prevent the collapse of the vessel during drought
Question 6
A geneticist is studying the inheri\tance of a particular trait in a population. If the trait is determined by a \single gene with two alleles, what is the probability that a child will inherit the dominant allele if the parents are both heterozygous?
A. 25%
B. 50%
C. 75%
D. 100%
Question 7
A diagram of the human kidney is shown below. What is the function of the part labeled 'D'?
A. To filter waste from the blood
B. To regulate blood pressure
C. To remove excess water from the blood
D. To store urine
Question 8
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will have the genotype 'TT'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 9
A diagram of a plant's root system is shown below. What is the function of the structure labeled 'A'?
A. absorbing water and nutrients from the soil
B. producing hormones to regulate plant growth
C. supporting the plant's structure and anchoring it in the soil
D. conducting water and minerals from the roots to the rest of the plant
Question 10
The diagram below shows a cross-section of the human eye. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 11
The human reproductive system consists of the male and female reproductive organs, which work together to produce
A. Sperm and egg cells
B. Zygote and placenta
C. Embryo and fetus
D. Infant and adult
Question 12
A population of rabbits is growing according to the \logistic growth model: \( \frac{dP}{dt} = rP \left\( 1 - \frac{P}{K} \right \). If the initial population size is 100 and the carrying capacity is 1000, what is the population size at time t = 5?
A. 500
B. 750
C. 900
D. 1000
Question 13
In a typical xylem vessel, what is the primary function of the pit membrane?
A. To regulate the rate of water uptake by the roots
B. To facilitate the transport of water and minerals
C. To prevent the collapse of the vessel during drought
D. To provide structural support to the vessel
Question 14
In a typical human kidney, what is the primary function of the renal corpuscle?
A. To filter waste products from the blood
B. To regulate blood pressure
C. To produce hormones
D. To control electrolyte balance
Question 15
A plant with the genotype 'Aa' is crossed with a plant with the genotype 'AA'. What is the probability that the offspring will have the genotype 'aa'?
A. 0.25
B. 0.5
C. 0.75
D. 1.0

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