POST UTME UNIPORT 2020 Biology | Objective

Are you preparing for POST UTME UNIPORT 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 context of classification of living things, which of the following is an example of a characteristic that is used to distinguish between prokaryotic and eukaryotic cells?
Correct A. Presence of a true nucleus
B. Presence of mitochondria
C. Presence of a cell wall
D. Presence of ribosomes

Correct Answer: A

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Question 2
A plant cell is placed in a solution containing 0.1 M glu\cose. If the cell membrane is permeable to glu\cose, what will be the net movement of glu\cose molecules into the cell?
Correct A. From the solution into the cell
B. From the cell into the solution
C. No net movement
D. Dep\ends on the concentration gradient

Correct Answer: A

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Question 3
A diagram of a plant's transport system is shown below. Which of the following is the function of the xylem?
Correct A. Transport of water and minerals from the roots to the leaves
B. Transport of sugars and other organic compounds from the leaves to the rest of the plant
C. Both A and B
D. Neither A nor B

Correct Answer: A

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Question 4
A diagram of the human eye is shown below. Which of the following is the function of the retina?
A. B\ending of light as it enters the eye
Correct B. Detection of light by the photoreceptors
C. Both A and B
D. Neither A nor B

Correct Answer: B

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Question 5
A diagram of the human digestive system is shown below. Which of the following is the function of the pancreas?
Correct A. Production of digestive enzymes
B. Absorption of nutrients
C. Both A and B
D. Neither A nor B

Correct Answer: A

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Question 6
In the xylem transport system, what is the primary function of the xylem parenchyma cells?
Correct A. Storage of food and water
B. Transport of water and minerals
C. Production of ethylene
D. Regulation of stomatal opening

Correct Answer: A

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Question 7
A cell is placed in a hypertonic solution. What will happen to the cell?
Correct A. The cell will swell and eventually burst
B. The cell will shrink and lose water
C. The cell will remain unchanged
D. The cell will undergo mitosis

Correct Answer: A

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Question 8
In the human eye, what is the primary function of the retina?
A. To focus light on the lens
Correct B. To convert light into electrical signals
C. To regulate the amount of light entering the eye
D. To produce tears

Correct Answer: B

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Question 9
A plant is placed in a greenhouse with a temperature of 25°C. What will happen to the plant?
Correct A. The plant will grow faster
B. The plant will grow slower
C. The plant will remain unchanged
D. The plant will die

Correct Answer: A

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Question 10
In the process of mitosis, what is the primary function of the spindle fibers?
A. To separate the chromosomes
B. To attach the chromosomes to the spindle fibers
Correct C. To move the chromosomes to the poles
D. To regulate the amount of DNA replication

Correct Answer: C

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Question 11
In the context of hormonal coordination, what is the primary function of the hypothalamus?
A. Regulation of body temperature
B. Stimulation of appetite
Correct C. Regulation of hormone secretion
D. Inhibition of stress response

Correct Answer: C

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Question 12
Asexual reproduction in plants often involves the formation of what type of structure?
A. Rhizome
B. Tuber
Correct C. Stolon
D. Bud

Correct Answer: C

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Question 13
The process of osmoregulation in animals involves the regulation of what type of balance?
Correct A. Water balance
B. Electrolyte balance
C. pH balance
D. Oxygen balance

Correct Answer: A

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Question 14
The diagram below shows a cross-section of a plant root. What is the function of the structure labeled 'A'?
Correct A. Absorption of water
B. Transport of nutrients
C. Storage of starch
D. Regulation of pH

Correct Answer: A

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Question 15
The Hardy-Weinberg principle states that the frequency of a gene in a population remains cons\tant from generation to generation if certain conditions are met. What is the primary condition that must be met?
A. Random mating
B. No mutation
C. No gene flow
Correct D. All of the above

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?
Correct A. 0.36
B. 0.64
C. 0.16
D. 0.04

Correct Answer: A

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Question 17
A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. What is the pressure of the gas?
Correct A. 1.01 × 10^5 Pa
B. 2.02 × 10^5 Pa
C. 3.03 × 10^5 Pa
D. 4.04 × 10^5 Pa

Correct Answer: A

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Question 18
A plant has a photosynthetic rate of 10 μmol CO2 s-1. If the plant is exposed to light for 8 hours, how much CO2 is fixed?
A. 76800 μmol
Correct B. 768000 μmol
C. 7680000 μmol
D. 76800000 μmol

Correct Answer: B

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Question 19
A 50 mL sample of a solution containing 0.1 M glu\cose is titrated with 0.1 M HCl. What is the pH of the solution after 25 mL of HCl has been added?
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 20
A 5% solution of phenol in water has a density of 1.05 g mL-1. What is the molarity of the solution?
A. 0.05 M
Correct B. 0.1 M
C. 0.2 M
D. 0.5 M

Correct Answer: B

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Question 21
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 22
A 5% solution of glu\cose in water has a concentration of 0.05 g/mL. What is the mass of glu\cose in 250 mL of this solution?
A. 1.25 g
Correct B. 1.50 g
C. 1.75 g
D. 2.00 g

Correct Answer: B

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Question 23
A plant has a root system that is adapted for water absorption in a xeric environment. Which of the following structures is most likely to be present in this plant?
A. Taproot
B. Fibrous root system
Correct C. Adventitious roots
D. Lenticels

Correct Answer: C

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Question 24
A 2.5 L container holds 2.0 L of a 0.1 M solution of NaCl. What is the concentration of the solution after adding 0.5 L of water?
A. 0.05 M
Correct B. 0.075 M
C. 0.10 M
D. 0.125 M

Correct Answer: B

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Question 25
A 50 mL sample of a 0.5 M solution of HCl is added to 100 mL of a 0.1 M solution of NaOH. What is the concentration of the resulting solution?
A. 0.05 M
Correct B. 0.075 M
C. 0.10 M
D. 0.125 M

Correct Answer: B

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