POST UTME UNILAG 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a population of 1000 individuals, 70% are heterozygous for the ABO blood group gene, 20% are homozygous dominant, and 10% are homozygous recessive. What is the expected genotype and phenotype of the offspring when two heterozygous individuals are crossed?
A. Genotype: AA, Phenotype: Type A blood
B. Genotype: AO, Phenotype: Type A blood
C. Genotype: AO, Phenotype: Type O blood
D. Genotype: OO, Phenotype: Type O blood
Question 2
A plant has a mutation in the gene that controls the production of chlorophyll. Which of the following is a likely consequence of this mutation?
A. Increased photosynthesis
B. Decreased photosynthesis
C. No effect on photosynthesis
D. Increased respiration
Question 3
A certain species of animal has a reproductive rate of 20% per year. If the population is initially 1000 individuals, how many individuals will there be after 5 years?
A. 1000
B. 1200
C. 1400
D. 1600
Question 4
A diagram of a human digestive system is shown below. Which part of the digestive system is responsible for absorbing nutrients from the food?
A. Mouth
B. Esophagus
C. Small intestine
D. Stomach
Question 5
A 2.5 L \tank contains 1.8 mol of an ideal gas at 27°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.2 atm
B. 1.5 atm
C. 1.8 atm
D. 2.1 atm
Question 6
A person has a blood glu\cose level of 120 mg/dL. What is the likely effect of insulin on the person's blood glu\cose level?
A. Increase blood glu\cose level
B. Decrease blood glu\cose level
C. No effect on blood glu\cose level
D. Increase insulin production
Question 7
A 50-year-old man has a blood pressure of 160/90 mmHg. What is the classification of his blood pressure according to the American Heart Association?
A. Hypertension Stage 1
B. Hypertension Stage 2
C. Hypertension Stage 3
D. Normal Blood Pressure
Question 8
In a closed e\cosystem, the rate of respiration in a population of rabbits is 0.5 g/h. If the population size is 1000 individuals, and the average mass of a rabbit is 2 kg, what is the total rate of oxygen consumption in the e\cosystem?
A. 0.2778 g/min
B. 0.2778 g/s
C. 0.2778 g/h
D. 0.2778 g/day
Question 9
A diagram of a plant's root system is shown below. Which part of the root system is responsible for absorbing water and minerals from the soil?
A. Root hairs
B. Root cap
C. Stem
D. Leaf
Question 10
A solution of 0.1 M glu\cose is passed through a dialysis membrane with a molecular weight cutoff of 10,000 g/mol. What is the concentration of glu\cose in the solution after dialysis?
A. 0.0018 M
B. 0.018 M
C. 0.18 M
D. 1.8 M
Question 11
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 dominant genotype 'AA'?
A. 0.64
B. 0.36
C. 0.16
D. 0.84
Question 12
A neuron is stimulated by a neurotransmitter that binds to a receptor on the neuron's surface. What is the next step in the process?
A. Depolarization of the neuron
B. Hyperpolarization of the neuron
C. Release of neurotransmitter from the neuron
D. Inhibition of the neuron
Question 13
A certain species of plant has a growth rate of 20% per day. If a seedling is 10 cm tall on the first day, how tall will it be after 5 days?
A. 10 cm
B. 15 cm
C. 25 cm
D. 30 cm
Question 14
The main function of the ribosomes in a cell is to
A. synthesize proteins
B. regulate cell growth
C. control cell division
D. produce ATP
Question 15
A 5-year-old child has a body mass index (BMI) of 20. What is the classification of the child's weight status according to the World Health Organization?
A. Underweight
B. Normal Weight
C. Overweight
D. Obese

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