POST UTME AAUA 2022 Biology | Objective

Are you preparing for POST UTME AAUA exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2022 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 is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype?
A. 0.2
B. 0.4
Correct C. 0.6
D. 0.8

Correct Answer: C

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Question 2
A plant cell has a vacuole that contains 0.5 M sucrose. If the cell membrane is permeable to sucrose, what is the concentration of sucrose in the cytosol after 10 minutes?
A. 0.4 M
Correct B. 0.5 M
C. 0.6 M
D. 0.7 M

Correct Answer: B

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Question 3
A 2.0 g sample of a subs\tance is dissolved in 100 mL of water. If the molarity of the solution is 0.5 M, what is the molar mass of the subs\tance?
A. 40 g/mol
B. 50 g/mol
Correct C. 60 g/mol
D. 70 g/mol

Correct Answer: C

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Question 4
A population of bacteria is growing exponentially. If the initial population is 100 cells and the population doubles every 2 hours, what is the population after 6 hours?
A. 1000 cells
B. 2000 cells
C. 4000 cells
Correct D. 8000 cells

Correct Answer: D

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Question 5
A 5.0 g sample of a subs\tance is burned in a combustion reaction. If the volume of carbon dioxide produced is 2.5 L at STP, what is the empirical formula of the subs\tance?
Correct A. CH4
B. CO2
C. H2O
D. O2

Correct Answer: A

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Question 6
The process by which microorganisms, such as bacteria, acquire antibiotic resis\tance is known as
Correct A. Horizontal Gene Transfer
B. Vertical Gene Transfer
C. Mutation
D. Gene Duplication

Correct Answer: A

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Question 7
In the context of eco\logy, what is the term for the process by which plants convert light energy into chemical energy?
Correct A. Photosynthesis
B. Respiration
C. Decomposition
D. Fermentation

Correct Answer: A

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Question 8
The theory of evolution by natural selection, proposed by Charles Darwin, suggests that species adapt to their environment through
A. Genetic Drift
B. Mutation
C. Gene Flow
Correct D. Selection Pressure

Correct Answer: D

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Question 9
The process by which an organism excretes waste products, such as urea, is known as
A. Osmoregulation
Correct B. Excretion
C. Regulation
D. Homeostasis

Correct Answer: B

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Question 10
The diagram below shows a cross-section of a plant root. What is the function of the labeled structure?
Correct A. Transport of water and minerals
B. Transport of sugars and amino acids
C. Storage of nutrients
D. Support of the plant

Correct Answer: A

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Question 11
The Hardy-Weinberg principle states that genetic variation in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?
A. Random mating
B. No mutation
Correct C. No gene flow
D. No natural selection

Correct Answer: C

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Question 12
A cell is placed in a solution with a high concentration of a certain ion. The cell membrane is selectively permeable, and the cell is initially at equilibrium. Which of the following will occur?
Correct A. The cell will swell and eventually burst
B. The cell will shrink and eventually die
C. The cell will remain unchanged
D. The cell will undergo mitosis

Correct Answer: A

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Question 13
A population of rabbits is introduced to a new island. The population grows exponentially at first, but eventually levels off. Which of the following is a possible explanation for this phenomenon?
A. The rabbits are competing for resources
Correct B. The rabbits are being preyed upon by predators
C. The rabbits are adapting to their environment
D. The rabbits are experiencing genetic drift

Correct Answer: B

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Question 14
A scientist is studying the effect of a certain chemical on the growth of plants. The scientist measures the growth of the plants over a period of time and finds that the growth is directly proportional to the concentration of the chemical. Which of the following is a possible explanation for this phenomenon?
Correct A. The chemical is stimulating the growth of the plants
B. The chemical is inhibiting the growth of the plants
C. The chemical is having no effect on the growth of the plants
D. The chemical is cau\sing the plants to die

Correct Answer: A

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Question 15
A certain species of bird is known to migrate to a different region during the winter months. Which of the following is a possible explanation for this phenomenon?
A. The birds are searching for food
Correct B. The birds are escaping harsh weather conditions
C. The birds are migrating to a different breeding ground
D. The birds are experiencing genetic drift

Correct Answer: B

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Question 16
The diagram below shows the structure of a plant cell. Which part is responsible for photosynthesis?
A. Vacuole
Correct B. Chloroplast
C. Cell wall
D. Nucleus

Correct Answer: B

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Question 17
A population of rabbits is growing at a rate of 20% per year. If the initial population is 100, what will be the population after 3 years?
A. 160
B. 180
Correct C. 200
D. 220

Correct Answer: C

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Question 18
The diagram below shows the structure of a neuron. Which part is responsible for transmitting signals?
Correct A. Axon
B. D\endrite
C. Cell body
D. Myelin sheath

Correct Answer: A

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Question 19
A car travels from city A to city B at an average speed of 60 km/h. If the dis\tance between the two cities is 240 km, how long does the journey take?
A. 4
Correct B. 4.5
C. 5
D. 6

Correct Answer: B

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Question 20
The diagram below shows the water cycle. Which part is responsible for evaporation?
A. Ocean
Correct B. Atmosphere
C. Land
D. Waterfall

Correct Answer: B

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Question 21
In a population of 1000 bacteria, 80% are susceptible to a particular antibiotic. If 200 bacteria are exposed to the antibiotic, what is the expected number of resis\tant bacteria?
A. 120
Correct B. 160
C. 200
D. 240

Correct Answer: B

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Question 22
A 5-year-old child is diagnosed with acute lymphoblastic leukemia (ALL). The child's white blood cell count is 100,000 cells per microliter. Which of the following is the most appropriate initial treatment?
Correct A. Vincristine and prednisone
B. Cyclophosphamide and doxorubicin
C. Methotrexate and cytarabine
D. L-asparaginase and mercaptopurine

Correct Answer: A

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Question 23
A 30-year-old woman presents with a 2-year history of recurrent urinary tract infections (UTIs). She has a history of kidney stones and has undergone multiple courses of antibiotics. Which of the following is the most likely diagnosis?
Correct A. Recurrent UTI due to Escherichia coli
B. Recurrent UTI due to Klebsiella pneumoniae
C. Recurrent UTI due to Pseudomonas aeruginosa
D. Recurrent UTI due to Candida albicans

Correct Answer: A

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Question 24
A 40-year-old man presents with a 6-month history of progressive shortness of breath and fatigue. He has a history of smoking 2 packs of cigarettes per day for 20 years. Which of the following is the most likely diagnosis?
Correct A. Chronic obstructive pulmonary disease (COPD)
B. Asthma
C. Pulmonary embolism
D. Lung cancer

Correct Answer: A

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Question 25
A 25-year-old woman presents with a 3-month history of recurrent episodes of abdominal pain and diarrhea. She has a history of celiac disease and has been following a gluten-free diet. Which of the following is the most likely diagnosis?
A. Irritable bowel syndrome (IBS)
Correct B. Inflammatory bowel disease (IBD)
C. Celiac disease
D. Gastroesophageal reflux disease (GERD)

Correct Answer: B

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