POST UTME UNILAG 2025 Biology | Objective

Are you preparing for POST UTME UNILAG exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2025 Biology (Objective) questions designed to simulate the real exam environment.

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
Correct B. Genotype: AO, Phenotype: Type A blood
C. Genotype: AO, Phenotype: Type O blood
D. Genotype: OO, Phenotype: Type O blood

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
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
Correct C. 1.8 atm
D. 2.1 atm

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 3
A plant with the genotype RrSs is crossed with a plant with the genotype RRSS. What is the probability that the offspring will have the genotype RrSs?
A. 0.25
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 4
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
Correct B. Hypertension Stage 2
C. Hypertension Stage 3
D. Normal Blood Pressure

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 5
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
Correct B. Normal Weight
C. Overweight
D. Obese

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 6
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?
Correct A. 0.2778 g/min
B. 0.2778 g/s
C. 0.2778 g/h
D. 0.2778 g/day

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 7
A population of 1000 individuals of a species of bird is observed to have a birth rate of 0.2 per individual per year, and a death rate of 0.1 per individual per year. What is the expected change in population size after 5 years?
A. 1000
Correct B. 1100
C. 1200
D. 1300

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 8
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?
Correct A. 0.0018 M
B. 0.018 M
C. 0.18 M
D. 1.8 M

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 9
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?
Correct A. 0.1 g/100 mL
B. 1 g/100 mL
C. 10 g/100 mL
D. 100 g/100 mL

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 10
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?
Correct A. 0.1 g/100 mL
B. 1 g/100 mL
C. 10 g/100 mL
D. 100 g/100 mL

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 11
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
Correct C. 0.20
D. 0.30

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 12
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
Correct D. 30 cm

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 13
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
Correct D. 2500

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 14
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
Correct D. 1600

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 15
A certain species of plant has a growth rate of 30% per day. If a seedling is 20 cm tall on the first day, how tall will it be after 4 days?
A. 20 cm
B. 25 cm
C. 30 cm
Correct D. 35 cm

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 16
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'?
Correct A. 0.64
B. 0.36
C. 0.16
D. 0.84

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 17
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'?
Correct A. 0.5
B. 0.25
C. 0.75
D. 0.33

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 18
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?
Correct A. Root hairs
B. Root cap
C. Stem
D. Leaf

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 19
A diagram of a human respiratory system is shown below. Which part of the respiratory system is responsible for exchanging oxygen and carbon dioxide?
Correct A. Lungs
B. Trachea
C. Diaphragm
D. Bronchi

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 20
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
Correct C. Small intestine
D. Stomach

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 21
In the xylem of a plant, what is the primary function of the tracheids?
Correct A. Transport of water and minerals from the roots to the leaves
B. Production of sugars through photosynthesis
C. Storage of nutrients and water
D. Regulation of stomatal opening

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 22
The process of osmoregulation in animals involves the regulation of
Correct A. Water and electrolyte balance
B. pH levels and blood sugar
C. Body temperature and blood pressure
D. Hormone levels and sleep patterns

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 23
The classification of living things into kingdoms is based on
A. Cell structure and function
B. Metabolism and energy production
Correct C. Genetic makeup and evolutionary history
D. Body shape and size

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 24
The biotic and abiotic factors in an e\cosystem interact to form a
A. Food chain
B. Food web
Correct C. E\cosystem
D. Biome

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 25
The process of natural selection involves the
Correct A. Survival and reproduction of individuals with favorable traits
B. Extinction of individuals with unfavorable traits
C. Adaptation of individuals to their environment
D. Evolution of new species

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub:
Chat with Support