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POST UTME UNILORIN 2018 Biology | Objective

Are you preparing for POST UTME UNILORIN 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.

Practice these randomly selected questions to test your readiness.

Question 1

In the context of cellular respiration, what is the primary function of the electron transport chain?

A. To generate ATP through substrate-level phosphorylation

B. To produce NADH and FADH2

Correct C. To pump protons across the mitochondrial membrane

D. To reduce oxygen to water

Correct Answer: C

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Question 2

A population of Drosophila melanogaster is being studied for its evolutionary adaptations. Which of the following traits is most likely to be influenced by natural selection?

A. Eye color

B. Wing length

C. Body size

Correct D. Resis\tance to pesticides

Correct Answer: D

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Question 3

A diagram of a plant cell is shown below. What is the function of the structure labeled 'X'?

A. To synthesize proteins

B. To store genetic information

C. To generate energy for the cell

Correct D. To regulate the cell's osmotic balance

Correct Answer: D

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Question 4

A diagram of a human circulatory system is shown below. What is the function of the structure labeled 'Y'?

A. To pump blood from the heart to the lungs

Correct B. To transport oxygenated blood from the lungs to the body

C. To return deoxygenated blood from the body to the heart

D. To regulate blood pressure

Correct Answer: B

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Question 5

A diagram of a plant root system is shown below. What is the function of the structure labeled 'Z'?

Correct A. To absorb water and nutrients from the soil

B. To transport water and nutrients from the roots to the leaves

C. To regulate the plant's osmotic balance

D. To synthesize chlorophyll

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 'AA'?

Correct A. 0.16

B. 0.36

C. 0.64

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 the gas is added to the flask, what is the new pressure of the gas?

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 plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'rr'?

Correct A. 0.25

B. 0.50

C. 0.75

D. 0.90

Correct Answer: A

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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. 0.5

Correct B. 1.0

C. 2.0

D. 3.0

Correct Answer: B

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Question 10

A population of bacteria is growing exponentially. If the initial population is 100 and the population doubles every 2 hours, what is the population after 6 hours?

A. 1600

B. 3200

Correct C. 6400

D. 12800

Correct Answer: C

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Question 11

In the context of evolutionary bio\logy, what is the primary mechanism by which species adapt to their environment?

Correct A. Natural Selection

B. Genetic Drift

C. Gene Flow

D. Mutation

Correct Answer: A

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Question 12

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 happen to the concentration of glu\cose inside the cell?

A. The concentration of glu\cose will increase

B. The concentration of glu\cose will decrease

Correct C. The concentration of glu\cose will remain the same

D. The cell will burst

Correct Answer: C

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Question 13

A diagram of a plant's xylem and phloem is shown below. What is the primary function of the xylem?

Correct A. Transport of water and minerals

B. Transport of sugars and amino acids

C. Storage of starch and proteins

D. Synthesis of chlorophyll

Correct Answer: A

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Question 14

A population of rabbits is growing exponentially. If the initial population is 100 and the growth rate is 20% per year, what will be the population after 5 years?

A. 1000

B. 2000

C. 5000

Correct D. 10000

Correct Answer: D

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Question 15

A diagram of a human digestive system is shown below. What is the primary function of the pancreas?

A. Production of bile

Correct B. Production of digestive enzymes

C. Absorption of nutrients

D. Storage of glycogen

Correct Answer: B

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Question 16

In the context of excretion and osmoregulation, what is the primary function of the kidneys in maintaining homeostasis?

A. Regulation of blood pH

B. Removal of waste products

Correct C. Maintenance of water balance

D. Regulation of blood pressure

Correct Answer: C

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Question 17

A diagram of the human digestive system is shown below. Identify the organ responsible for the breakdown of proteins into smaller peptides.

Correct A. Stomach

B. Small intestine

C. Pancreas

D. Liver

Correct Answer: A

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Question 18

A diagram of the human circulatory system is shown below. Identify the organ responsible for the regulation of blood pressure.

A. Heart

Correct B. Kidneys

C. Lungs

D. Liver

Correct Answer: B

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Question 19

A diagram of the human respiratory system is shown below. Identify the organ responsible for the exchange of oxygen and carbon dioxide.

Correct A. Lungs

B. Trachea

C. Bronchi

D. Diaphragm

Correct Answer: A

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Question 20

A diagram of the human nervous system is shown below. Identify the organ responsible for the integration of sensory information.

Correct A. Brain

B. Spinal cord

C. Cerebellum

D. Cerebrum

Correct Answer: A

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Question 21

In a population of 1000 bacteria, 80% are resis\tant to penicillin. If 200 bacteria are randomly selected for treatment, what is the probability that at least 150 will be resis\tant to penicillin?

Correct A. 0.95

B. 0.90

C. 0.85

D. 0.80

Correct Answer: A

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Question 22

A plant with the genotype AaBb produces 25% red flowers and 75% white flowers. What is the genotype of the plant?

A. AABB

Correct B. AAbb

C. AaBB

D. Aabb

Correct Answer: B

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Question 23

A solution containing 2.5 g of glu\cose is diluted to a total volume of 250 mL. What is the concentration of the solution in g/L?

A. 10 g/L

B. 20 g/L

Correct C. 25 g/L

D. 30 g/L

Correct Answer: C

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Question 24

A person with a blood type of AB+ can receive blood from which of the following types?

Correct A. A+

B. B+

C. AB-

D. O-

Correct Answer: A

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Question 25

A diagram of the human eye is shown below. What is the function of the part labeled 'C'?

A. to focus light

B. to regulate light entry

Correct C. to change the shape of the lens

D. to detect light

Correct Answer: C

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