POST UTME ESUT 2020 Biology | Objective

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 'AA'?
A. 0.64
B. 0.36
C. 0.16
D. 0.04
Question 2
A diagram of a human digestive system is shown below. What is the primary function of the structure labeled 'Z'?
A. To break down proteins into amino acids
B. To break down carbohydrates into simple sugars
C. To break down fats into fatty acids and glycerol
D. To absorb water and electrolytes
Question 3
In a desert e\cosystem, what is the primary function of the xerophytes?
A. To produce organic compounds from inorganic subs\tances
B. To conserve water and withs\tand drought
C. To synthesize complex molecules from simple subs\tances
D. To absorb and store energy from sunlight
Question 4
A diagram of the human circulatory system is shown below. Which part of the system is responsible for transporting oxygenated blood to the body?
A. Arteries
B. Capillaries
C. Veins
D. Heart
Question 5
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 6
A population of bacteria is growing exponentially. If the initial population is 100 and the population doubles every 2 hours, what is the population after 6 hours?
A. 1000
B. 2000
C. 4000
D. 8000
Question 7
A cell is placed in a solution with a concentration of 0.1 M glu\cose. If the cell has a permeability coefficient of 1.5 x 10^-6 cm/s, what is the rate of glu\cose uptake?
A. 1.5 x 10^-6 mol/cm^2/s
B. 3.0 x 10^-6 mol/cm^2/s
C. 4.5 x 10^-6 mol/cm^2/s
D. 6.0 x 10^-6 mol/cm^2/s
Question 8
The diagram below shows a cross-section of a plant root. What is the function of the part labeled 'A'?
A. absorption of water and minerals
B. transport of sugars and amino acids
C. storage of food and water
D. support and protection
Question 9
A Punnett square is shown below. What is the probability of an offspring being homozygous dominant?
A. 0.25
B. 0.5
C. 0.75
D. 1.0
Question 10
A diagram of the human respiratory system is shown below. Which part of the system is responsible for exchanging oxygen and carbon dioxide?
A. Nose
B. Trachea
C. Bronchi
D. Alveoli
Question 11
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. Punnett square
D. Heterosis
Question 12
A solution contains 0.5 M NaCl and 0.2 M glu\cose. What is the osmotic pressure of the solution?
A. 0.7 atm
B. 1.0 atm
C. 1.3 atm
D. 1.5 atm
Question 13
A plant with the genotype RrSs is crossed with a plant with the genotype rrSS. What is the probability that the offspring will have the genotype RrSs?
A. 0.25
B. 0.5
C. 0.75
D. 1.0
Question 14
The diagram below shows a cross-section of a human eye. What is the function of the part labeled 'C'?
A. to focus light onto the retina
B. to control the amount of light entering the eye
C. to convert light into electrical signals
D. to detect color and depth
Question 15
A plant cell has a vacuole that contains 0.5 M sucrose solution. If the cell membrane is selectively permeable and has a permeability coefficient of 1.5 x 10^-6 cm/s for sucrose, what is the rate of sucrose efflux from the vacuole?
A. 1.5 x 10^-6 cm/s
B. 3.0 x 10^-6 cm/s
C. 4.5 x 10^-6 cm/s
D. 6.0 x 10^-6 cm/s

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