POST UTME COVENANT UNIVERSITY 2018 Biology | Objective

Are you preparing for POST UTME COVENANT UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
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
Correct B. No mutation
C. No gene flow
D. No natural selection

Correct Answer: B

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Question 2
A plant with the genotype AaBbCcc is crossed with a plant with the genotype AAbbCC. What is the probability that the offspring will have the genotype AaBbCc?
Correct A. 1/8
B. 1/4
C. 1/2
D. 3/4

Correct Answer: A

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Question 3
The diagram below shows a cross between two pea plants.
A. Tall plants with green pods
B. Short plants with green pods
Correct C. Tall plants with yellow pods
D. Short plants with yellow pods

Correct Answer: C

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Question 4
The process of mitosis results in the production of daughter cells that are genetically identical to the parent cell. Which of the following is a characteristic of the daughter cells produced by mitosis?
A. Diploid
B. Haploid
C. Genetically identical
Correct D. All of the above

Correct Answer: D

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Question 5
The diagram below shows a cross between two animals.
A. Tall animals with green fur
B. Short animals with green fur
Correct C. Tall animals with yellow fur
D. Short animals with yellow fur

Correct Answer: C

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Question 6
In a population of E. coli, the frequency of the gene for resis\tance to ampicillin is 0.2. If 1000 bacteria are plated on agar containing ampicillin, how many would be expected to be resis\tant?
A. 100
Correct B. 200
C. 500
D. 1000

Correct Answer: B

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Question 7
A 2.5 g sample of a compound containing only carbon, hydrogen, and oxygen is analyzed by combustion. The amount of CO2 produced is 1.2 g, and the amount of H2O produced is 0.5 g. What is the empirical formula of the compound?
Correct A. C2H4O
B. C3H6O2
C. C4H8O3
D. C5H10O4

Correct Answer: A

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Question 8
A diagram of a plant cell is shown below. What is the function of the structure labeled 'X'?
A. site of protein synthesis
B. site of lipid synthesis
C. site of carbohydrate synthesis
Correct D. site of nucleic acid synthesis

Correct Answer: D

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Question 9
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. 1
Correct B. 7
C. 10
D. 14

Correct Answer: B

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Question 10
A diagram of a simple harmonic oscillator is shown below. What is the frequency of the oscillator?
A. 1 Hz
Correct B. 2 Hz
C. 3 Hz
D. 4 Hz

Correct Answer: B

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Question 11
The diagram below shows a cross-section of a plant root. Identify the type of tissue labeled 'A' in the diagram.
Correct A. Parenchyma
B. Collenchyma
C. Sclerenchyma
D. Xylem

Correct Answer: A

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Question 12
The nervous system of an organism is responsible for transmitting signals from the sense organs to the brain. Which of the following is NOT a type of sense organ?
A. Eye
B. Ear
Correct C. Mouth
D. Skin

Correct Answer: C

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Question 13
The diagram below shows a cross-section of a human eye. Identify the part labeled 'B' in the diagram.
A. Cornea
Correct B. Iris
C. Lens
D. Retina

Correct Answer: B

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Question 14
The diagram below shows a cross-section of a human brain. Identify the part labeled 'C' in the diagram.
A. Cerebrum
B. Cerebellum
Correct C. Brainstem
D. Spinal Cord

Correct Answer: C

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Question 15
The diagram below shows a cross-section of a human heart. Identify the part labeled 'D' in the diagram.
A. Atrium
B. Ventricle
C. Septum
Correct D. Valve

Correct Answer: D

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Question 16
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'RR'?
Correct A. 0.64
B. 0.36
C. 0.16
D. 0.04

Correct Answer: A

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Question 17
A plant cell has a vacuole that contains 0.5 M sucrose. If the cell membrane is permeable to sucrose, what will be the concentration of sucrose in the cytosol after 10 minutes?
A. 0.4 M
Correct B. 0.3 M
C. 0.2 M
D. 0.1 M

Correct Answer: B

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Question 18
A 2.0 L solution of 0.1 M glu\cose is diluted to 5.0 L. What is the new concentration of glu\cose?
A. 0.02 M
Correct B. 0.04 M
C. 0.06 M
D. 0.08 M

Correct Answer: B

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Question 19
A cell has a membrane potential of -70 mV. If the cell is depolarized by 10 mV, what is the new membrane potential?
Correct A. -60 mV
B. -65 mV
C. -70 mV
D. -75 mV

Correct Answer: A

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Question 20
A 1.0 L solution of 0.5 M NaCl is mixed with a 1.0 L solution of 0.5 M NaCl. What is the concentration of NaCl in the resulting solution?
A. 0.5 M
Correct B. 0.75 M
C. 1.0 M
D. 1.25 M

Correct Answer: B

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