POST UTME LASU 2020 Biology | Objective

Are you preparing for POST UTME LASU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In the xylem, what is the primary function of the tracheids?
Correct 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

Correct Answer: A

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Question 2
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
Correct D. Heritability

Correct Answer: D

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Question 3
In the process of respiration, what is the byproduct of glycolysis?
A. ATP
B. NADH
C. FADH2
Correct D. Pyruvate

Correct Answer: D

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Question 4
What is the term for the process by which plants convert light energy into chemical energy?
Correct A. Photosynthesis
B. Respiration
C. Transpiration
D. Translocation

Correct Answer: A

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Question 5
In the process of excretion, what is the primary function of the kidneys?
A. Regulation of blood pressure
Correct B. Production of urine
C. Storage of waste products
D. Regulation of electrolyte balance

Correct Answer: B

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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
Correct B. 0.64
C. 0.48
D. 0.72

Correct Answer: B

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Question 7
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?
Correct A. 0.25
B. 0.5
C. 0.75
D. 1.0

Correct Answer: A

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Question 8
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
Correct B. 0.75
C. 1.0
D. 1.25

Correct Answer: B

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Question 9
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
Correct D. 20.0

Correct Answer: D

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Question 10
A 50.0 g sample of glu\cose is dissolved in 100.0 mL of water. What is the molarity of the solution?
A. 1.0
B. 2.0
C. 3.0
Correct D. 5.0

Correct Answer: D

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Question 11
In the context of cell division, what is the primary function of the centrioles during the prophase stage?
Correct A. To form the spindle fibers
B. To replicate the DNA
C. To condense the chromatin
D. To form the nuclear envelope

Correct Answer: A

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Question 12
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
Correct B. It will decrease
C. It will remain the same
D. It will become negative

Correct Answer: B

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Question 13
A diagram of a human kidney is shown below. What is the function of the renal corpuscle?
Correct A. To filter the blood
B. To regulate the blood pressure
C. To produce urine
D. To store waste products

Correct Answer: A

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Question 14
A diagram of a human heart is shown below. What is the function of the atrioventricular valves?
A. To regulate the blood pressure
Correct B. To prevent backflow of blood
C. To increase the heart rate
D. To decrease the heart rate

Correct Answer: B

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Question 15
A diagram of a human brain is shown below. What is the function of the cerebral cortex?
A. To regulate the body temperature
B. To control the heart rate
Correct C. To process sensory information
D. To store memories

Correct Answer: C

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Question 16
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'?
Correct A. 0.36
B. 0.64
C. 0.72
D. 0.84

Correct Answer: A

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Question 17
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
Correct B. 7.0
C. 7.5
D. 8.0

Correct Answer: B

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Question 18
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?
Correct A. Point mutation
B. Frameshift mutation
C. Deletion
D. Insertion

Correct Answer: A

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Question 19
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
Correct B. 200
C. 300
D. 400

Correct Answer: B

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Question 20
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?
Correct A. Point mutation
B. Frameshift mutation
C. Deletion
D. Insertion

Correct Answer: A

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