POST UTME LAUTECH 2017 Biology | Objective

Are you preparing for POST UTME LAUTECH exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2017 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In a typical e\cosystem, what is the primary role of photosynthesis in the nutrient cycle?
A. To produce oxygen and release carbon dioxide
Correct B. To convert light energy into chemical energy
C. To release nutrients from dead organisms
D. To absorb nutrients from the soil

Correct Answer: B

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Question 2
A 2.5g sample of a compound is dissolved in 50ml of water. If the molarity of the solution is 0.5M, what is the molar mass of the compound?
A. 50g/mol
B. 100g/mol
C. 200g/mol
Correct D. 250g/mol

Correct Answer: D

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Question 3
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
Correct A. To focus light on the retina
B. To detect movement
C. To regulate pupil size
D. To produce tears

Correct Answer: A

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Question 4
A 10ml sample of a solution containing 0.5M NaCl is mixed with 20ml of water. What is the new concentration of the solution?
A. 0.25M
Correct B. 0.5M
C. 0.75M
D. 1.0M

Correct Answer: B

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Question 5
A diagram of the human kidney is shown below. What is the function of the part labeled 'B'?
Correct A. To filter waste from the blood
B. To regulate blood pressure
C. To produce urine
D. To store waste

Correct Answer: A

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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?
Correct A. 0.36
B. 0.64
C. 0.72
D. 0.84

Correct Answer: A

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Question 7
A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. If 1.0 mol of gas is added to the flask, what is the new pressure?
A. 2.5 atm
Correct B. 3.0 atm
C. 3.5 atm
D. 4.0 atm

Correct Answer: B

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Question 8
A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the pH of the resulting solution?
A. 0
Correct B. 1
C. 2
D. 3

Correct Answer: B

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Question 9
A plant grows in a pot with a mixture of soil and sand. The plant's roots absorb water and nutrients from the soil. What is the primary function of the roots?
Correct A. to absorb water and nutrients
B. to produce chlorophyll
C. to regulate water loss
D. to support the plant's structure

Correct Answer: A

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Question 10
A population of bacteria grows according to the equation N(t) = N0e^(kt), where N(t) is the population size at time t, N0 is the initial population size, e is the base of the natural \logarithm, and k is the growth rate. If the population size doubles every 2 hours, what is the growth rate?
A. 0.05 h^\( -1 \)
Correct B. 0.10 h^\( -1 \)
C. 0.15 h^\( -1 \)
D. 0.20 h^\( -1 \)

Correct Answer: B

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Question 11
The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation if five conditions are met. Which of the following is NOT one of the five conditions?
A. Large population size
B. Random mating
C. No mutation
Correct D. No genetic drift

Correct Answer: D

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Question 12
A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?
A. Photosynthesis
B. Respiration
Correct C. Transport of materials
D. Storage of nutrients

Correct Answer: C

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Question 13
The process of mitosis is responsible for the production of which of the following?
A. Sperm cells
B. Egg cells
C. Muscle cells
Correct D. Skin cells

Correct Answer: D

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Question 14
A diagram of a neuron is shown below. What is the function of the structure labeled 'B'?
Correct A. Transmission of signals
B. Storage of information
C. Synthesis of proteins
D. Degradation of waste

Correct Answer: A

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Question 15
The process of meiosis is responsible for the production of which of the following?
Correct A. Sperm cells
B. Egg cells
C. Muscle cells
D. Skin cells

Correct Answer: A

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Question 16
In the context of cellular respiration, what is the primary function of the citric acid cycle?
A. To generate ATP through substrate-level phosphorylation
Correct B. To produce NADH and FADH2 for the electron transport chain
C. To synthesize glu\cose from non-carbohydrate sources
D. To break down fatty acids for energy production

Correct Answer: B

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Question 17
A researcher is studying the effects of pH on enzyme activity. Which of the following enzymes is most likely to be affected by a change in pH?
A. Lactase
B. Amylase
Correct C. Pep\sin
D. Tryp\sin

Correct Answer: C

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Question 18
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
Correct A. To focus light on the retina
B. To detect changes in light intensity
C. To regulate the amount of light entering the eye
D. To produce tears for lubrication

Correct Answer: A

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Question 19
A researcher is studying the effects of temperature on enzyme activity. Which of the following enzymes is most likely to be affected by a change in temperature?
A. Lactase
Correct B. Amylase
C. Pep\sin
D. Tryp\sin

Correct Answer: B

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Question 20
A diagram of the human kidney is shown below. What is the function of the part labeled 'B'?
Correct A. To filter waste products from the blood
B. To regulate the amount of water in the body
C. To produce hormones for growth and development
D. To store waste products for excretion

Correct Answer: A

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Question 21
In a population of 1000 individuals, 70% have the dominant allele for brown eye color (B) and 30% have the recessive allele (b). If two individuals are randomly selected for a genetic study, what is the probability that both will have brown eye color?
Correct A. 0.49
B. 0.49
C. 0.49
D. 0.49

Correct Answer: A

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Question 22
A 2-year-old child is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. The child's parents are both carriers of the mutated gene. What is the probability that their next child will be affected by the disorder?
A. 25%
Correct B. 50%
C. 75%
D. 100%

Correct Answer: B

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Question 23
A researcher is studying the genetic variation of a specific trait in a population of 500 individuals. The trait is determined by a \single gene with two alleles: A and a. The frequency of allele A is 0.6, and the frequency of allele a is 0.4. What is the expected frequency of the AA genotype in the population?
Correct A. 0.36
B. 0.36
C. 0.36
D. 0.36

Correct Answer: A

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Question 24
A 30-year-old woman is diagnosed with a rare genetic disorder that affects the production of a specific hormone. The disorder is inherited in an autosomal dominant pattern. What is the probability that her 5-year-old son will be affected by the disorder?
Correct A. 0%
B. 25%
C. 50%
D. 100%

Correct Answer: A

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Question 25
A researcher is studying the genetic variation of a specific trait in a population of 1000 individuals. The trait is determined by a \single gene with two alleles: B and b. The frequency of allele B is 0.7, and the frequency of allele b is 0.3. What is the expected frequency of the BB genotype in the population?
Correct A. 0.49
B. 0.49
C. 0.49
D. 0.49

Correct Answer: A

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