POST UTME LASU 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A population of Drosophila melanogaster is maintained in a laboratory. The population size is 1000 individuals, and the sex ratio is 1:1. The average lifespan of the flies is 30 days. If the population is allowed to grow exponentially, what is the carrying capacity of the population?
A. 1000
B. 5000
C. 10000
D. 20000
Question 2
In the process of cellular respiration, which of the following is the primary source of energy for the cell?
A. Glu\cose
B. ATP
C. NADH
D. FADH2
Question 3
A 2.5-liter solution of 0.1 M NaCl is diluted by adding 2.5 liters of water. What is the new concentration of NaCl in the solution?
A. 0.02 M
B. 0.04 M
C. 0.06 M
D. 0.08 M
Question 4
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will have the genotype 'TT'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 5
The Hardy-Weinberg principle states that allele and genotype 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. No mutation
C. No gene flow
D. No genetic drift
Question 6
The nervous system is responsible for transmitting signals from one part of the body to another. Which of the following types of fibers is responsible for transmitting sensory information?
A. A-\alpha
B. A-\beta
C. A-\gamma
D. A-delta
Question 7
In a study on the effect of light on plant growth, the following data were collected: Light (hours) | Growth (cm) 0 | 2 4 | 4 8 | 6 12 | 8. What is the rate of growth per hour of light?
A. 0.5 cm/h
B. 1 cm/h
C. 1.5 cm/h
D. 2 cm/h
Question 8
A 2-year-old child is diagnosed with a rare genetic disorder characterized by an inability to break down certain amino acids. Which of the following is the most likely underlying cause?
A. Deficiency of the enzyme phenylalanine hydroxylase
B. Deficiency of the enzyme tyro\sinase
C. Deficiency of the enzyme galactose-1-phosphate uridyltransferase
D. Deficiency of the enzyme albinism
Question 9
The process of meiosis results in the production of gametes with half the number of chromosomes as the parent cell. Which of the following is a result of meiosis?
A. Increased genetic variation
B. Decreased genetic variation
C. No change in genetic variation
D. Increased genetic drift
Question 10
The respiratory system in humans is primarily responsible for the exchange of gases between the environment and the body. Which of the following is a key component of the respiratory system?
A. Trachea
B. Bronchi
C. Lungs
D. Diaphragm
Question 11
A diagram of the human digestive system is shown below. What is the function of the pancreas?
A. Production of bile
B. Production of digestive enzymes
C. Absorption of nutrients
D. Storage of waste products
Question 12
A plant is placed in a solution with a concentration of 0.1 M salt. If the plant is permeable to salt, what is the equilibrium concentration of salt inside the plant?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 13
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 population size doubles, what is the new rate of respiration?
A. Increases by a factor of 2
B. Increases by a factor of 4
C. Increases by a factor of 8
D. Remains the same
Question 14
The hormone insulin is produced by the pancreas and plays a crucial role in regulating blood sugar levels. Which of the following is a function of insulin?
A. Increa\sing blood glu\cose levels
B. Decrea\sing blood glu\cose levels
C. Regulating protein synthesis
D. Regulating lipid metabolism
Question 15
A diagram of a human eye is shown below. Identify the part labeled 'B'.
A. Cornea
B. Iris
C. Retina
D. Lens

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