POST UTME ABU 2018 Biology | Objective

Are you preparing for POST UTME ABU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 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 Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population size is 1000, what is the expected number of homozygous recessive individuals?
A. 200
Correct B. 400
C. 600
D. 800

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 2
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. If 1.5 mol of the same gas is added to the flask at the same temperature, what is the new pressure?
A. 1.5 atm
B. 2.5 atm
Correct C. 3.5 atm
D. 4.5 atm

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 3
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'?
Correct A. 0.25
B. 0.5
C. 0.75
D. 0.9

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 4
A 10 L flask contains 2 mol of an ideal gas at 25°C. If the gas is heated to 50°C, what is the new volume?
A. 20 L
B. 30 L
Correct C. 40 L
D. 50 L

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 5
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
Correct C. 0.75
D. 0.9

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 6
In a tropical rainforest e\cosystem, the primary producers are mainly composed of which of the following plant species?
A. Mangroves
B. Bamboo
Correct C. Tropical trees
D. Cacti

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 7
The process by which plants convert light energy into chemical energy is known as?
Correct A. Photosynthesis
B. Respiration
C. Transpiration
D. Osmosis

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 8
The cell wall of a plant cell is primarily composed of?
Correct A. Cellulose
B. Chitin
C. Pectin
D. Lignin

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 9
The process of meiosis results in the production of?
Correct A. Haploid cells
B. Diploid cells
C. Somatic cells
D. Germ cells

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 10
The genetic variation in a population is increased by?
Correct A. Mutation
B. Gene flow
C. Genetic drift
D. Natural selection

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 11
The process of cellular respiration involves the breakdown of glu\cose to produce ATP. Which of the following is a key intermediate in this process?
A. Pyruvate
Correct B. Acetyl-CoA
C. Citrate
D. Oxaloacetate

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 12
The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation if certain conditions are met. Which of the following is NOT one of these conditions?
A. Random mating
B. No mutation
C. No gene flow
Correct D. Cons\tant population size

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 13
The bacterium Escherichia coli (E. coli) is a common inhabi\tant of the human gut. Which of the following is a key feature of E. coli that allows it to thrive in this environment?
A. Ability to synthesize its own amino acids
B. Ability to fix nitrogen from the air
Correct C. Ability to ferment lactose
D. Ability to produce antibiotics

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 14
The cell cycle is the process by which a cell grows, replicates its DNA, and divides into two daughter cells. Which of the following stages of the cell cycle is characterized by the replication of the cell's DNA?
A. G1 phase
Correct B. S phase
C. G2 phase
D. M phase

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 15
The process of excretion involves the removal of waste products from the body. Which of the following organs is responsible for the excretion of urine?
A. Liver
Correct B. Kidneys
C. Pancreas
D. Spleen

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 16
In the process of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
Correct B. To pump protons across the mitochondrial membrane, creating a proton gradient
C. To reduce NAD+ to NADH
D. To produce water as a byproduct of oxidative phosphorylation

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 17
Which of the following hormones is primarily responsible for regulating blood glu\cose levels during fasting?
A. Insulin
Correct B. Glucagon
C. Adrenaline
D. Thyroid hormone

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 18
In the xylem, what is the primary function of the tracheary elements?
Correct A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the rest of the plant
C. To provide structural support to the plant
D. To regulate gas exchange between the plant and the atmosphere

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 19
Which of the following types of growth is characterized by an increase in cell size?
A. Meristematic growth
B. Intercalary growth
C. Diffusive growth
Correct D. Isometric growth

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 20
In the human eye, what is the primary function of the retina?
A. To focus light onto the lens
Correct B. To detect light and convert it into electrical signals
C. To regulate the amount of light entering the eye
D. To produce tears to lubricate the eye

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 21
In asexual reproduction, what is the primary mechanism by which genetic variation is introduced?
A. Mutation
Correct B. Genetic recombination
C. Gene duplication
D. Gene deletion

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 22
What is the primary function of the Golgi apparatus in eukaryotic cells?
A. Protein synthesis
B. Lipid synthesis
Correct C. Carbohydrate modification
D. Protein degradation

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 23
In the context of cellular respiration, what is the primary role of the electron transport chain?
Correct A. To generate ATP
B. To produce NADH
C. To reduce oxygen
D. To produce FADH2

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 24
What is the primary mechanism by which the body regulates blood glu\cose levels?
Correct A. Insulin and glucagon
B. Glucagon and epinephrine
C. Insulin and epinephrine
D. Glucagon and insulin

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 25
In the context of plant growth and development, what is the primary role of auxins?
Correct A. To promote cell elongation
B. To promote cell division
C. To promote root growth
D. To promote stem growth

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