Practice Post UTME UI biology 2025 Past Questions

Question 1

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 2

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

A. To focus light onto the retina

B. To re\fract light entering the eye

Correct C. To detect light intensity

D. To regulate pupil size

Correct Answer: C

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Question 3

A population of E. coli is growing in a nutrient-rich environment. If the initial population size is 100 cells and the population doubles every 2 hours, what is the population size after 6 hours?

A. 1000

B. 2000

C. 4000

Correct D. 8000

Correct Answer: D

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Question 4

A diagram of the human kidney is shown below. What is the function of the part labeled 'D'?

A. To filter waste from the blood

B. To regulate blood pressure

C. To remove excess water from the blood

Correct D. To store urine

Correct Answer: D

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Question 5

A population of yeast is growing in a nutrient-rich environment. If the initial population size is 50 cells and the population triples every 3 hours, what is the population size after 9 hours?

A. 1500

B. 2250

C. 3750

Correct D. 5625

Correct Answer: D

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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 with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will have the genotype 'TT'?

Correct A. 0.25

B. 0.5

C. 0.75

D. 0.9

Correct Answer: A

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Question 8

A solution of glu\cose (C6H12O6) is prepared by dissolving 20g of glu\cose in 100ml of water. What is the concentration of the solution in g/L?

A. 100

Correct B. 200

C. 300

D. 400

Correct Answer: B

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Question 9

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'?

A. 0.25

Correct B. 0.5

C. 0.75

D. 0.9

Correct Answer: B

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Question 10

A solution of sodium chloride (NaCl) is prepared by dissolving 10g of NaCl in 100ml of water. What is the concentration of the solution in g/L?

A. 50

Correct B. 100

C. 150

D. 200

Correct Answer: B

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Question 11

In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is triggered by the activation of the

A. S phase

B. G1 phase

C. G2 phase

Correct D. Prophase

Correct Answer: D

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Question 12

The diagram below shows a cross-section of the human eye. Which part of the eye is responsible for detecting light?

A. Cornea

B. Iris

Correct C. Retina

D. Lens

Correct Answer: C

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Question 13

The process of meiosis is a type of cell division that results in the production of

A. 2 daughter cells

Correct B. 4 daughter cells

C. 8 daughter cells

D. 16 daughter cells

Correct Answer: B

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Question 14

The diagram below shows a simple circuit. If the switch is closed, what will happen to the current flowing through the circuit?

Correct A. Increase

B. Decrease

C. Remain the same

D. Become zero

Correct Answer: A

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Question 15

The human reproductive system consists of the male and female reproductive organs, which work together to produce

Correct A. Sperm and egg cells

B. Zygote and placenta

C. Embryo and fetus

D. Infant and adult

Correct Answer: A

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Question 16

In a human body, the process of gas exchange occurs primarily in the lungs, where oxygen from the air is transferred into the blood and carbon dioxide is removed from the blood. Which of the following structures is responsible for the diffusion of oxygen into the blood?

Correct A. Alveoli

B. Bronchioles

C. Pulmonary arteries

D. Trachea

Correct Answer: A

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Question 17

A plant cell is placed in a solution with a high concentration of sucrose. Which of the following processes will occur in the cell?

A. Osmosis

Correct B. Diffusion

C. Active transport

D. Passive transport

Correct Answer: B

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Question 18

A diagram of the human reproductive system is shown below. Which of the following structures is responsible for the production of sperm?

Correct A. Testis

B. Epididymis

C. Vas deferens

D. Prostate gland

Correct Answer: A

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Question 19

A diagram of the human digestive system is shown below. Which of the following structures is responsible for the breakdown of proteins?

A. Mouth

Correct B. Stomach

C. Small intestine

D. Large intestine

Correct Answer: B

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Question 20

A diagram of the human circulatory system is shown below. Which of the following structures is responsible for the transport of oxygen to the body?

Correct A. Heart

B. Arteries

C. Veins

D. Capillaries

Correct Answer: A

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Question 21

In a typical human kidney, what is the primary function of the renal corpuscle?

Correct A. To filter waste products from the blood

B. To regulate blood pressure

C. To produce hormones

D. To control electrolyte balance

Correct Answer: A

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Question 22

A geneticist is studying the inheri\tance of a particular trait in a population. If the trait is determined by a \single gene with two alleles, what is the probability that a child will inherit the recessive allele if the parents are both heterozygous?

A. 25%

Correct B. 50%

C. 75%

D. 100%

Correct Answer: B

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Question 23

In a plant cell, what is the primary function of the vacuole?

Correct A. To store water and nutrients

B. To synthesize proteins

C. To regulate pH levels

D. To maintain cell shape

Correct Answer: A

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Question 24

A bio\logist is studying the structure of a mitochondrion. What is the primary function of the cristae?

Correct A. To increase surface area for gas exchange

B. To store energy in the form of ATP

C. To synthesize proteins

D. To regulate pH levels

Correct Answer: A

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Question 25

A geneticist is studying the inheri\tance of a particular trait in a population. If the trait is determined by a \single gene with two alleles, what is the probability that a child will inherit the dominant allele if the parents are both heterozygous?

A. 25%

Correct B. 50%

C. 75%

D. 100%

Correct Answer: B

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