POST UTME LASU 2021 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 plant with the genotype 'Rr' is crossed with a plant with the genotype 'rr'. What is the probability that the offspring will have the genotype 'RR'?
A. 0.25
B. 0.5
C. 0.75
D. 1.0
Question 3
A plant grows in a pot with a mixture of soil and sand. The plant's roots absorb water and nutrients from the soil, but the sand prevents the soil from becoming too dense. What is the name of this type of soil?
A. Loam
B. Sandy loam
C. Clay loam
D. Silt loam
Question 4
A population of 1000 rabbits is introduced to an island with an initial population of 500 rabbits. The population of rabbits on the island grows according to the \logistic growth model dP/dt = rP\( 1 - P/K \), where r = 0.05 and K = 2000. What is the population of rabbits on the island after 10 years?
A. 1500
B. 1800
C. 2000
D. 2200
Question 5
A cell in the G2 phase of the cell cycle has a DNA content of 8C. What is the stage of the cell cycle that this cell will enter next?
A. G1
B. S
C. G2
D. M
Question 6
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
A. To focus light on the retina
B. To detect movement
C. To regulate pupil size
D. To produce tears
Question 7
A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. What is the pressure of the gas?
A. 101325 Pa
B. 202650 Pa
C. 303875 Pa
D. 405100 Pa
Question 8
A person has a blood type of AB and a Rh factor of positive. What is the genotype of this person?
A. I^A I^A i i
B. I^A i I^B i
C. I^A I^A I^B I^B
D. i i I^A I^A
Question 9
A diagram of the human eye is shown below. Identify the structure labeled 'Y'.
A. Retina
B. Iris
C. Lens
D. None of the above
Question 10
A population of bacteria is growing exponentially. If the initial population size is 1000 and the growth rate is 20% per hour, what will be the population size after 3 hours?
A. 16000
B. 32000
C. 64000
D. 128000
Question 11
A 50 g sample of a compound containing only C, H, and O is analyzed by combustion analysis. The mass of CO2 produced is 21.5 g, and the mass of H2O produced is 9.5 g. What is the empirical formula of the compound?
A. C2H4O
B. C3H6O
C. C4H8O2
D. C5H10O
Question 12
In a tropical rainforest, the average temperature is 25°C, and the relative humidity is 80%. What is the approximate vapor pressure of the air?
A. 20 kPa
B. 25 kPa
C. 30 kPa
D. 35 kPa
Question 13
A researcher is studying the nervous system of a specific species of animal. Which of the following is an example of a synapse?
A. The connection between two neurons
B. The release of neurotransmitters
C. The reception of signals by a neuron
D. The transmission of signals along a neuron
Question 14
A 2.0 L flask contains 0.5 M NaOH. If 25 mL of 1.0 M HCl is slowly added to the flask, what is the concentration of the resulting solution?
A. 0.4 M
B. 0.5 M
C. 0.6 M
D. 0.7 M
Question 15
The hypothalamus is a region of the brain that regulates body temperature, hunger, and thirst. What is the name of the hormone that is released by the hypothalamus to stimulate appetite?
A. Insulin
B. Glucagon
C. Ghrelin
D. Leptin

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