POST UTME LASU 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.0 L flask contains 0.5 M glu\cose. If 0.5 L of 1.0 M glu\cose is added to the flask, what is the new concentration of glu\cose?
A. 0.5
B. 0.75
C. 1.0
D. 1.25
Question 2
A researcher is studying the effect of light on the growth of plants. The graph below shows the growth of plants at different light intensities. What is the light intensity at which the growth rate is maximum?
A. 100
B. 200
C. 300
D. 400
Question 3
A patient is diagnosed with a disease caused by a bacterium that has a mutation in its genome. The bacterium has a mutation in the gene that codes for the protein responsible for the disease. What type of mutation is this?
A. Point mutation
B. Frameshift mutation
C. Deletion
D. Insertion
Question 4
In the process of respiration, what is the byproduct of glycolysis?
A. ATP
B. NADH
C. FADH2
D. Pyruvate
Question 5
A diagram of a human kidney is shown below. What is the function of the renal corpuscle?
A. To filter the blood
B. To regulate the blood pressure
C. To produce urine
D. To store waste products
Question 6
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. 0.36
B. 0.64
C. 0.72
D. 0.84
Question 7
A researcher is studying the effect of pH on the growth of E. coli. The graph below shows the growth of E. coli at different pH levels. What is the pH level at which the growth rate is maximum?
A. 6.5
B. 7.0
C. 7.5
D. 8.0
Question 8
A plant cell has a vacuole that contains 0.5 M sucrose. If the cell membrane is permeable to sucrose, what is the concentration of sucrose in the cytosol after 30 minutes?
A. 0.25
B. 0.5
C. 0.75
D. 1.0
Question 9
In the context of cell division, what is the primary function of the centrioles during the prophase stage?
A. To form the spindle fibers
B. To replicate the DNA
C. To condense the chromatin
D. To form the nuclear envelope
Question 10
A patient is diagnosed with a disease caused by a virus that has a mutation in its genome. The virus has a mutation in the gene that codes for the protein responsible for the disease. What type of mutation is this?
A. Point mutation
B. Frameshift mutation
C. Deletion
D. Insertion
Question 11
A plant cell is placed in a solution with a high concentration of salt. What will happen to the cell's turgor pressure?
A. It will increase
B. It will decrease
C. It will remain the same
D. It will become negative
Question 12
In the process of excretion, what is the primary function of the kidneys?
A. Regulation of blood pressure
B. Production of urine
C. Storage of waste products
D. Regulation of electrolyte balance
Question 13
In the xylem, what is the primary function of the tracheids?
A. Transport of water and minerals from roots to leaves
B. Production of sugars through photosynthesis
C. Storage of nutrients and water in the plant
D. Regulation of gas exchange between the plant and atmosphere
Question 14
A plant has a photosynthetic rate of 10.0 μmol CO2 s^-1. If the light intensity is increased by a factor of 2, what is the new photosynthetic rate?
A. 5.0
B. 10.0
C. 15.0
D. 20.0
Question 15
What is the term for the process by which an organism's genetic information is passed from one generation to the next?
A. Mutation
B. Genetic drift
C. Natural selection
D. Heritability

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