Practice Post UTME KSU biology 2025 Past Questions

Question 1

In a population of 1000 individuals, 70% are heterozygous for the gene controlling the production of the enzyme lactase. If 50% of the individuals are homozygous recessive for the gene, what is the expected frequency of the homozygous dominant genotype?

Correct A. 0.25

B. 0.30

C. 0.35

D. 0.40

Correct Answer: A

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Question 2

A diagram of a plant cell is shown below. Identify the part labeled 'A'.

Correct A. Nucleus

B. Mitochondria

C. Chloroplast

D. Vacuole

Correct Answer: A

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Question 3

A 2.5-liter solution of 0.5 M NaCl is mixed with a 1.5-liter solution of 0.2 M NaCl. What is the concentration of the resulting solution?

A. 0.35 M

Correct B. 0.40 M

C. 0.45 M

D. 0.50 M

Correct Answer: B

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Question 4

A diagram of a simple harmonic motion is shown below. Identify the part labeled 'B'.

A. Amplitude

Correct B. Period

C. Frequency

D. Wavelength

Correct Answer: B

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Question 5

A 0.5 M solution of HCl is mixed with a 0.2 M solution of NaOH. 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 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 recessive genotype 'aa'?

Correct A. 0.04

B. 0.16

C. 0.24

D. 0.36

Correct Answer: A

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Question 7

A researcher is studying the effect of light intensity on the rate of photosynthesis in a plant. If the rate of photosynthesis is directly proportional to the light intensity, and the rate is 12.5 mg CO2/h when the light intensity is 200 μmol/m2s, what is the rate of photosynthesis when the light intensity is 400 μmol/m2s?

A. 25 mg CO2/h

Correct B. 50 mg CO2/h

C. 75 mg CO2/h

D. 100 mg CO2/h

Correct Answer: B

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Question 8

A diagram of a plant cell is shown below. Identify the part labeled 'X'.

A. Mitochondria

B. Nucleus

C. Vacuole

Correct D. Plastid

Correct Answer: D

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Question 9

A diagram of a simple harmonic motion is shown below. If the amplitude of the motion is 5 cm and the time period is 2 s, what is the angular frequency?

A. 1.57 rad/s

Correct B. 3.14 rad/s

C. 6.28 rad/s

D. 9.42 rad/s

Correct Answer: B

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Question 10

A researcher is studying the effect of temperature on the growth of a microorganism. If the growth rate is directly proportional to the temperature, and the growth rate is 0.5 mm/h when the temperature is 30°C, what is the growth rate when the temperature is 40°C?

A. 1.25 mm/h

Correct B. 2.5 mm/h

C. 5 mm/h

D. 10 mm/h

Correct Answer: B

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Question 11

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 12

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. 0.5

B. 0.75

C. 0.25

D. 0.33

Correct Answer: A

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Question 13

A solution containing 0.1 M glu\cose and 0.2 M fructose is separated u\sing a semipermeable membrane. What is the concentration of glu\cose in the solution on the side of the membrane with the higher concentration?

A. 0.05 M

Correct B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: B

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Question 14

A 1.5 L solution contains 0.5 M NaCl. What is the concentration of Na+ ions in the solution?

A. 0.25 M

Correct B. 0.5 M

C. 0.75 M

D. 1.0 M

Correct Answer: B

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Question 15

A 2.0 L solution contains 0.8 M glu\cose. What is the concentration of glu\cose in the solution in g/L?

A. 640 g/L

Correct B. 800 g/L

C. 960 g/L

D. 1120 g/L

Correct Answer: B

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Question 16

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. 0.64

B. 0.36

C. 0.16

D. 0.8

Correct Answer: A

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Question 17

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 18

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

Correct A. Photosynthesis

B. Respiration

C. Cell division

D. Cell growth

Correct Answer: A

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Question 19

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

A. Absorption of nutrients

Correct B. Digestion of proteins

C. Secretion of enzymes

D. Storage of food

Correct Answer: B

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Question 20

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

Correct A. Pumping of blood

B. Oxygenation of blood

C. Filtering of blood

D. Storage of blood

Correct Answer: A

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Question 21

In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'BB'?

Correct A. 0.36

B. 0.64

C. 0.16

D. 0.04

Correct Answer: A

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Question 22

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. 1/4

B. 1/2

C. 3/4

D. 3/8

Correct Answer: A

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Question 23

A diagram of a plant cell is shown below. Identify the part labeled 'A'.

Correct A. Mitochondria

B. Nucleus

C. Cell wall

D. Chloroplast

Correct Answer: A

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Question 24

A diagram of a simple circuit is shown below. Identify the part labeled 'A'.

Correct A. Battery

B. Resistor

C. Switch

D. Wire

Correct Answer: A

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Question 25

A diagram of a titration setup is shown below. Identify the part labeled 'A'.

Correct A. Burette

B. Beaker

C. Pipette

D. Titration flask

Correct Answer: A

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