POST UTME UNIBEN 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A population of rabbits is growing according to the \logistic growth equation. If the carrying capacity is 1000 and the initial population is 100, what is the population size after 5 generations?
A. 500
B. 750
C. 900
D. 1000
Question 2
A certain species of animal has a life cycle that consists of four stages: egg, larva, pupa, and adult. The duration of each stage is 1 day, 2 days, 3 days, and 4 days, respectively. If the animal is in the larva stage on day 5, what stage will it be in on day 10?
A. egg
B. larva
C. pupa
D. adult
Question 3
The process of meiosis results in the production of four haploid daughter cells from a \single 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 ploidy level than the parent cell
Question 4
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 light intensity
C. To regulate pupil size
D. To produce tears
Question 5
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. 1600
B. 1800
C. 2000
D. 2200
Question 6
In a population of E. coli, the frequency of the gene for antibiotic resis\tance is 0.2. If the population size is 10^6, how many individuals are expected to be resis\tant to the antibiotic?
A. 2000
B. 20000
C. 200000
D. 2000000
Question 7
A certain species of animal has a life cycle that consists of four stages: egg, larva, pupa, and adult. The duration of each stage is 1 day, 2 days, 3 days, and 4 days, respectively. If the animal is in the larva stage on day 5, what stage will it be in on day 10?
A. egg
B. larva
C. pupa
D. adult
Question 8
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 9
In a closed e\cosystem, the rate of respiration in a population of organisms is directly proportional to the square root of the population size. If the initial population size is 1000 and the rate of respiration is 50 units, what is the rate of respiration when the population size reaches 1600?
A. 75 units
B. 80 units
C. 85 units
D. 90 units
Question 10
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 11
A plant grows in a controlled environment with a cons\tant temperature of 25°C and a photoperiod of 12 hours. What is the expected effect on the plant's growth?
A. Increased growth rate
B. Decreased growth rate
C. No effect on growth rate
D. Increased leaf size
Question 12
A plant has a root system with a radius of 5 cm and a height of 10 cm. If the plant is placed in a pot with a radius of 10 cm, what is the volume of the soil displaced?
A. 1000
B. 2000
C. 3000
D. 4000
Question 13
In the context of evolutionary theory, what is the term for the process by which a new species emerges from an existing one?
A. Speciation
B. Adaptation
C. Mutation
D. Genetic drift
Question 14
A diagram of the human respiratory system is shown below. Which part of the system is responsible for exchanging oxygen and carbon dioxide?
A. Trachea
B. Bronchi
C. Alveoli
D. Diaphragm
Question 15
What is the primary function of the hypothalamus in the regulation of body temperature?
A. To maintain a cons\tant body temperature
B. To regulate body temperature in response to changes in the environment
C. To produce hormones that stimulate sweating and shivering
D. To produce hormones that inhibit sweating and shivering

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