POST UTME LASU 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
A genetic cross is performed between two pea plants, one with the genotype TT and the other with the genotype tt. What is the probability that the offspring will have the genotype Tt?
A. 1/4
B. 1/2
C. 3/4
D. 1
Question 3
A kidney stone is formed due to an imbalance of ions in the urine. Which of the following ions is most likely to be responsible for the formation of the stone?
A. Calcium
B. Magnesium
C. Potassium
D. Sodium
Question 4
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
Question 5
In the context of cell division, what is the primary function of the centrioles during the prophase stage of mitosis?
A. To form the spindle fibers
B. To replicate the DNA
C. To condense the chromosomes
D. To form the nuclear envelope
Question 6
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 7
A person has a blood pressure of 120/80 mmHg. What is the diastolic pressure?
A. 80
B. 90
C. 100
D. 110
Question 8
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 9
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 10
A researcher is studying the behavior of a specific species of bird in a forest e\cosystem. Which of the following is an example of a habitat modification that could affect the bird's behavior?
A. The presence of a nearby stream
B. The density of tree cover
C. The availability of food sources
D. The presence of a predator
Question 11
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 12
A population of rabbits is growing \logistically. If the carrying capacity is 1000 and the growth rate is 0.1 per year, what is the population size after 10 years?
A. 500
B. 750
C. 900
D. 1000
Question 13
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 14
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 15
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

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