POST UTME AAUA 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the context of xylem transport, what is the primary function of the xylem parenchyma cells?
A. Storage of water and nutrients
B. Transport of water and minerals
C. Production of ethylene
D. Regulation of stomatal aperture
Question 2
A diagram of a human digestive system is shown below. What is the primary function of the small intestine?
A. Breaking down proteins and fats into smaller molecules
B. Absorbing water and electrolytes
C. Storing waste until it can be eliminated
D. Producing digestive enzymes
Question 3
In the context of excretion and osmoregulation, what is the primary function of the kidneys in maintaining homeostasis?
A. Regulation of blood pH
B. Maintenance of blood pressure
C. Removal of waste products
D. Regulation of electrolyte balance
Question 4
The process of cellular respiration can be represented by the equation:
A. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O \)
B. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP \)
C. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + NADH \)
D. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + FADH_2 \)
Question 5
A 25-year-old male presents with a 2-day history of fever, headache, and confusion. Laboratory tests reveal a high white blood cell count and a low platelet count. What is the most likely diagnosis?
A. Meningitis
B. Encephalitis
C. Septicemia
D. Leukemia
Question 6
The diagram below shows the structure of a plant cell. Identify the part labeled A.
A. Cell wall
B. Chloroplast
C. Vacuole
D. Cytoplasm
Question 7
A population of Drosophila melanogaster is being studied for its genetic variation. The frequency of the recessive allele 'a' is 0.2, and the frequency of the dominant allele 'A' is 0.8. What is the expected frequency of the homozygous recessive genotype 'aa'?
A. 0.16
B. 0.24
C. 0.32
D. 0.40
Question 8
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth of the bacteria at different pH levels and plots the data on a graph. Which of the following best describes the relationship between pH and bacterial growth?
A. The growth of E. coli increases as the pH increases.
B. The growth of E. coli decreases as the pH decreases.
C. The growth of E. coli is unaffected by changes in pH.
D. The growth of E. coli is optimal at a pH of 7.
Question 9
A cell is in the G2 phase of the cell cycle. What is the next phase of the cell cycle?
A. G1
B. S
C. G2
D. M
Question 10
In the context of excretion, what is the primary function of the kidneys?
A. Regulation of blood pressure
B. Production of urine
C. Storage of waste products
D. Regulation of electrolyte balance
Question 11
A geneticist is studying the inheri\tance of a trait in a population of mice. The geneticist observes that the trait is inherited in an autosomal dominant pattern. Which of the following best describes the probability of a mouse inheriting the dominant allele?
A. 50%
B. 25%
C. 75%
D. 100%
Question 12
According to the theory of natural selection, what is the primary mechanism by which populations adapt to their environment?
A. Genetic drift
B. Gene flow
C. Mutation
D. Differential reproduction
Question 13
A population of rabbits is growing \logistically. The initial population size is 100, and the carrying capacity is 1000. If the growth rate is 0.2, what is the population size after 5 years?
A. 500
B. 600
C. 700
D. 800
Question 14
According to the Hardy-Weinberg principle, what is the expected frequency of the homozygous recessive genotype in a population?
A. 0.25
B. 0.5
C. 0.75
D. 1.0
Question 15
The process of digestion in the human body can be represented by the equation:
A. \( C_6H_{12}O_6 + H_2O \rightarrow C_6H_{12}O_6H_2O \)
B. \( C_6H_{12}O_6 + H_2O \rightarrow C_6H_{12}O_6 + H_2O \)
C. \( C_6H_{12}O_6 + H_2O \rightarrow C_6H_{12}O_6 + H_2O + ATP \)
D. \( C_6H_{12}O_6 + H_2O \rightarrow C_6H_{12}O_6 + H_2O + NADH \)

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