POST UTME UNILAG 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The biotic and abiotic factors in an e\cosystem interact to form a
A. Food chain
B. Food web
C. E\cosystem
D. Biome
Question 2
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 3
A certain e\cosystem has a primary producer that undergoes photosynthesis at a rate of 50% per day. If the producer is initially 1000 units, how many units will be produced after 3 days?
A. 1000
B. 1500
C. 2000
D. 2500
Question 4
A diagram of a human respiratory system is shown below. Which part of the respiratory system is responsible for exchanging oxygen and carbon dioxide?
A. Lungs
B. Trachea
C. Diaphragm
D. Bronchi
Question 5
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 6
The process of osmoregulation in animals involves the regulation of
A. Water and electrolyte balance
B. pH levels and blood sugar
C. Body temperature and blood pressure
D. Hormone levels and sleep patterns
Question 7
In a population of 1000 individuals, 20% are heterozygous for a particular gene, while 80% are homozygous recessive. If 10% of the population is randomly selected for a genetic study, what is the probability that at least one individual in the sample will be heterozygous?
A. 0.05
B. 0.10
C. 0.20
D. 0.30
Question 8
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
Question 9
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 10
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 11
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 12
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'Rr'?
A. 0.5
B. 0.25
C. 0.75
D. 0.33
Question 13
A 10% solution of NaCl is prepared by dissolving 10 g of NaCl in 90 g of water. What is the concentration of NaCl in the solution in g/100 mL?
A. 0.1 g/100 mL
B. 1 g/100 mL
C. 10 g/100 mL
D. 100 g/100 mL
Question 14
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 15
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

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