POST UTME ABU 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a typical xylem vessel, what is the primary function of the lignin-rich secondary cell wall?
A. To provide structural support to the vessel
B. To facilitate the transport of water and minerals
C. To regulate the rate of water flow
D. To store water and nutrients
Question 2
A researcher is studying the effect of temperature on the growth of a microorganism. Which of the following best describes the relationship between temperature and growth rate?
A. Temperature has a direct, linear relationship with growth rate
B. Temperature has an inverse, \logarithmic relationship with growth rate
C. Temperature has a direct, \logarithmic relationship with growth rate
D. Temperature has no effect on growth rate
Question 3
In a human body, the epithelial tissue is primarily responsible for forming the lining of the respiratory, gastrointestinal, and genitourinary tracts. Which of the following types of epithelial tissue is most likely to be found in the lining of the respiratory tract?
A. Simple Cuboidal Epithelium
B. Stratified Squamous Epithelium
C. Pseudostratified Columnar Epithelium
D. Simple Columnar Epithelium
Question 4
In the context of osmoregulation, what is the primary function of the kidneys in a marine-dwelling organism?
A. To conserve water by reabsorbing it from the filtrate
B. To excrete excess salt by producing a highly concentrated urine
C. To regulate electrolyte balance by adjusting the amount of ions in the urine
D. To maintain acid-base balance by adjusting the pH of the urine
Question 5
A 0.5 M solution of NaCl is prepared by dissolving 25 g of NaCl in 100 mL of water. What is the concentration of Cl- ions in the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 6
A researcher is studying the effect of temperature on the growth of bacteria. The researcher wants to determine the optimal temperature range for the growth of bacteria. Which of the following is the best method to determine the optimal temperature range?
A. U\sing a spectrophotometer to measure the absorbance of the culture
B. U\sing a thermometer to measure the temperature
C. U\sing a microscope to observe the morpho\logy of the cells
D. U\sing a plate reader to measure the growth of the culture
Question 7
A researcher is studying the effect of pH on the growth of a certain microorganism. The researcher measures the growth rate of the microorganism at different pH levels and plots the data on a graph. If the graph shows a sigmoidal curve, what is the most likely explanation for the shape of the curve?
A. The microorganism is adapting to the changing pH levels.
B. The microorganism is experiencing a lag phase.
C. The microorganism is experiencing a stationary phase.
D. The microorganism is experiencing a decline phase.
Question 8
A certain species of plant has a genetic trait that allows it to produce a toxic compound. If the plant is homozygous dominant for the gene controlling the production of the toxic compound, what is the probability that an offspring will be homozygous recessive?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 9
In the context of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
B. To produce NADH and FADH2
C. To pump protons across the mitochondrial membrane
D. To reduce oxygen to water
Question 10
A certain species of plant has a genetic trait that allows it to produce a toxic compound. If the plant is homozygous dominant for the gene controlling the production of the toxic compound, what is the probability that an offspring will be homozygous recessive?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 11
A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?
A. To synthesize proteins
B. To store genetic information
C. To regulate cell growth
D. To transport materials across the cell membrane
Question 12
The Hardy-Weinberg principle states that allele frequencies 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. Large population size
C. No mutation
D. No gene flow
Question 13
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
A. To focus light onto the retina
B. To detect movement and changes in brightness
C. To regulate the amount of light entering the eye
D. To produce tears to lubricate the eye
Question 14
A researcher is studying the effect of pH on the activity of the enzyme lactase. Which of the following best describes the relationship between pH and enzyme activity?
A. pH has a direct, linear relationship with enzyme activity
B. pH has an inverse, \logarithmic relationship with enzyme activity
C. pH has a direct, \logarithmic relationship with enzyme activity
D. pH has no effect on enzyme activity
Question 15
A diagram of the human eye is shown below. What is the function of the part labeled 'B'?

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