POST UTME AAUA 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of the human eye is shown below. What is the function of the structure labeled 'A'?
A. To focus light on the retina
B. To re\fract light entering the eye
C. To detect changes in light intensity
D. To regulate the amount of light entering the eye
Question 2
A 5-year-old child is diagnosed with a rare genetic disorder. The child's parents are both carriers of the recessive allele. What is the probability that their next child will be affected?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 3
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 conditions is NOT necessary for the Hardy-Weinberg principle to hold?
A. Random mating
B. No mutation
C. No gene flow
D. Cons\tant population size
Question 4
In the context of evolutionary theory, what is the primary mechanism by which natural selection acts on genetic variation?
A. Genetic drift
B. Mutation
C. Gene flow
D. Differential reproduction
Question 5
A 1.0 L solution contains 0.5 M glu\cose. If 0.5 L of 0.1 M glu\cose is added to the solution, what is the new concentration of glu\cose?
A. \( 0.5 + 0.1 \) M
B. \( 0.5 - 0.1 \) M
C. \( 0.5 \times 0.1 \) M
D. ( 0.5 div 0.1 ) M
Question 6
The process of meiosis results in the production of four haploid daughter cells from a diploid parent cell. Which of the following is a characteristic of the daughter cells produced during meiosis?
A. They have the same number of chromosomes as the parent cell
B. They have half the number of chromosomes as the parent cell
C. They have a mix of maternal and paternal chromosomes
D. They have a different number of chromosomes than the parent cell
Question 7
A plant cell is placed in a solution with a high concentration of salt. What is the expected outcome in terms of water potential?
A. Water potential increases
B. Water potential decreases
C. Water potential remains unchanged
D. Water potential becomes zero
Question 8
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 20% per hour, what will be the population size after 3 hours?
A. 1000
B. 2000
C. 4000
D. 8000
Question 9
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 conditions is necessary for the Hardy-Weinberg principle to hold?
A. Random mating
B. No mutation
C. No gene flow
D. Cons\tant population size
Question 10
A diagram of a plant's root system is shown below. What is the primary function of the root hairs?
A. To anchor the plant in the soil
B. To absorb water and minerals from the soil
C. To produce hormones that regulate plant growth
D. To store food for the plant
Question 11
A diagram of a human kidney is shown below. What is the primary function of the structure labeled 'A'?
A. Filtering waste from the blood
B. Regulating blood pressure
C. Maintaining electrolyte balance
D. Producing hormones
Question 12
The diagram below shows a cross-section of a plant root. Which of the following structures is responsible for the absorption of water and minerals from the soil?
A. The root hair cells
B. The xylem tissue
C. The phloem tissue
D. The cortex
Question 13
In the context of M\endelian genetics, what is the term for the phenomenon where a dominant allele masks the effect of a recessive allele?
A. Incomplete dominance
B. Codominance
C. Pseudodominance
D. Heterosis
Question 14
The diagram below shows a cross-section of a human eye. Which of the following structures is responsible for the accommodation of light in the eye?
A. The cornea
B. The lens
C. The retina
D. The iris
Question 15
A 1.0 L solution contains 0.6 M glu\cose. If 0.5 L of 0.1 M glu\cose is added to the solution, what is the new concentration of glu\cose?
A. \( 0.6 + 0.1 \) M
B. \( 0.6 - 0.1 \) M
C. \( 0.6 \times 0.1 \) M
D. ( 0.6 div 0.1 ) M

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