POST UTME AAUA 2024 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 2024 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
In a study on the epidemio\logy of malaria, researchers found that the prevalence of the disease was higher in areas with poor sanitation and inadequate waste management. Which of the following is the most likely explanation for this finding?
Correct A. The presence of s\tanding water allows the mosquito vector to breed and multiply.
B. Poor sanitation leads to the spread of other diseases that weaken the immune system, making individuals more susceptible to malaria.
C. Inadequate waste management attracts rodents that carry the disease-cau\sing parasite.
D. The high population density in these areas leads to increased transmission of the disease.

Correct Answer: A

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Question 2
A patient is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. Which of the following types of mutations is most likely responsible for this condition?
Correct A. Point mutation
B. Frameshift mutation
C. Deletion mutation
D. Insertion mutation

Correct Answer: A

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Question 3
A researcher is studying the behavior of a specific species of bird. The bird's habitat is characterized by a mix of grasslands and forests. Which of the following eco\logical concepts best describes the relationship between the bird's diet and its environment?
A. Symbiotic relationship
B. Competition
C. Predation
Correct D. Niche partitioning

Correct Answer: D

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Question 4
A patient is experiencing symptoms of a neuro\logical disorder that affects the coordination of muscle movements. Which of the following types of neurons is most likely responsible for this condition?
Correct A. Motor neuron
B. Sensory neuron
C. Interneuron
D. Association neuron

Correct Answer: A

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Question 5
A researcher is studying the genetic variation in a population of plants. Which of the following types of genetic variation is most likely to result in a change in the plant's phenotype?
A. Genetic drift
Correct B. Mutation
C. Gene flow
D. Natural selection

Correct Answer: B

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Question 6
In the context of eco\logical succession, what is the primary factor that determines the rate of succession in a given e\cosystem?
A. Climate
B. Topography
Correct C. Species diversity
D. Soil quality

Correct Answer: C

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Question 7
A plant cell contains 80% water by weight. If a 50g sample of the cell contains 40g of water, what is the mass of the non-aqueous components?
A. 10g
Correct B. 20g
C. 30g
D. 40g

Correct Answer: B

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Question 8
A 2.5L sample of a gas at 27°C and 1.5 atm is compressed to 3.5 atm. What is the new volume of the gas?
A. 1.5L
B. 2.5L
Correct C. 3.5L
D. 4.5L

Correct Answer: C

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Question 9
A population of 1000 rabbits is growing at a rate of 10% per year. What is the population after 5 years?
A. 1000
B. 1100
C. 1200
Correct D. 1300

Correct Answer: D

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Question 10
A 50g sample of a subs\tance contains 20g of carbon. What is the percentage composition of carbon in the subs\tance?
A. 30%
Correct B. 40%
C. 50%
D. 60%

Correct Answer: B

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Question 11
In the context of osmoregulation, what is the primary function of the kidneys in maintaining electrolyte balance?
A. To regulate the amount of water in the body
Correct B. To maintain the balance of electrolytes in the body
C. To remove waste products from the body
D. To regulate blood pressure

Correct Answer: B

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Question 12
A plant root system consists of a taproot and several lateral roots. What is the primary function of the taproot?
Correct A. To absorb water and nutrients from the soil
B. To anchor the plant in the soil
C. To store food and nutrients
D. To produce hormones

Correct Answer: A

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Question 13
In the process of cellular respiration, what is the primary function of the mitochondria?
Correct A. To generate energy for the cell
B. To synthesize proteins
C. To store genetic information
D. To regulate cell growth

Correct Answer: A

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Question 14
A genetic trait is determined by a \single gene with two alleles. What is the probability of an individual expres\sing the dominant allele if the genotype is heterozygous?
Correct A. 50%
B. 25%
C. 75%
D. 100%

Correct Answer: A

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Question 15
In a population of 100 individuals, 60 have the genotype AA and 40 have the genotype Aa. What is the frequency of the recessive allele?
A. 0.2
Correct B. 0.3
C. 0.4
D. 0.5

Correct Answer: B

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Question 16
A study on the genetic variation of a population found that the frequency of the dominant allele (A) is 0.6, while the frequency of the recessive allele (a) is 0.4. What is the expected genotype and phenotype of the offspring when two individuals with the genotype Aa are crossed?
A. Genotype: AA, Phenotype: Dominant
B. Genotype: Aa, Phenotype: Recessive
C. Genotype: aa, Phenotype: Dominant
Correct D. Genotype: Aa, Phenotype: Dominant

Correct Answer: D

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Question 17
A plant with the genotype Rr, where R represents the dominant allele for red flowers and r represents the recessive allele for white flowers, is crossed with a plant with the genotype rr. What is the probability that the offspring will have red flowers?
Correct A. 0.5
B. 0.25
C. 0.75
D. 0.33

Correct Answer: A

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Question 18
A diagram of the xylem and phloem tissues in a plant stem is shown below. Which of the following is a function of the xylem tissue?
Correct A. Transport of water and minerals
B. Transport of sugars and amino acids
C. Support and storage
D. Protection and defense

Correct Answer: A

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Question 19
A diagram of the human digestive system is shown below. Which of the following is a function of the small intestine?
A. Absorption of water and electrolytes
Correct B. Absorption of nutrients
C. Storage of waste
D. Elimination of waste

Correct Answer: B

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Question 20
A diagram of the human respiratory system is shown below. Which of the following is a function of the lungs?
Correct A. Exchange of oxygen and carbon dioxide
B. Production of sound
C. Storage of air
D. Elimination of waste

Correct Answer: A

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Question 21
In the context of osmoregulation, what is the primary function of the kidneys in a desert-dwelling organism?
Correct A. To conserve water by producing highly concentrated urine
B. To excrete excess salt and water through the process of osmoregulation
C. To regulate the body's pH levels through the excretion of acid or base
D. To produce hormones that stimulate the release of water from the body

Correct Answer: A

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Question 22
A plant cell is placed in a solution with a high concentration of sugar. What will happen to the cell?
Correct A. The cell will swell and eventually burst due to water uptake
B. The cell will shrink due to water loss
C. The cell will remain unchanged
D. The cell will undergo photosynthesis

Correct Answer: A

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Question 23
A population of rabbits is introduced to an island with no natural predators. What will happen to the population?
A. The population will remain cons\tant
B. The population will decrease due to overcrowding
Correct C. The population will increase exponentially
D. The population will stabilize at a carrying capacity

Correct Answer: C

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Question 24
A genetic trait is inherited in an autosomal dominant pattern. What is the probability that a child will inherit the trait if one parent is a carrier and the other parent is homozygous recessive?
A. 25%
Correct B. 50%
C. 75%
D. 100%

Correct Answer: B

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Question 25
A plant undergoes a process of photosynthesis. What is the overall equation for this process?
Correct A. \( 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2 \)
B. \( 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 3O_2 \)
C. \( 6CO_2 + 6H_2O \rightarrow 2C_6H_{12}O_6 + 6O_2 \)
D. \( 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 12O_2 \)

Correct Answer: A

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