Practice Post UTME CALEB UNIVERSITY biology 2025 Past Questions

Question 1

In a population of 1000 Drosophila melanogaster, 200 exhibit the recessive trait 'curled wings'. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele?

Correct A. 0.2

B. 0.4

C. 0.6

D. 0.8

Correct Answer: A

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Question 2

A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. If 1.5 mol of the gas is added to the flask, what is the new pressure?

A. 2.5 atm

B. 3.0 atm

Correct C. 3.5 atm

D. 4.0 atm

Correct Answer: C

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Question 3

A plant with the genotype 'Aa' is crossed with a plant with the genotype 'aa'. What is the probability that the offspring will have the genotype 'AA'?

Correct A. 0.25

B. 0.5

C. 0.75

D. 1.0

Correct Answer: A

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Question 4

A 50g sample of a subs\tance is dissolved in 100mL of water. If the molarity of the solution is 0.5M, what is the concentration of the subs\tance in g/L?

A. 0.25 g/L

Correct B. 0.5 g/L

C. 1.0 g/L

D. 2.0 g/L

Correct Answer: B

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Question 5

A 10g sample of a subs\tance is dissolved in 50mL of water. If the molarity of the solution is 0.2M, what is the concentration of the subs\tance in g/L?

Correct A. 0.4 g/L

B. 0.8 g/L

C. 1.2 g/L

D. 1.6 g/L

Correct Answer: A

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Question 6

In the context of photosynthesis, which of the following pigments is responsible for absorbing light energy in the blue-violet region of the visible spectrum?

A. Chlorophyll a

B. Chlorophyll b

C. Carotenoids

Correct D. Phycobiliproteins

Correct Answer: D

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Question 7

A researcher is studying the effects of habitat fragmentation on population dynamics in a forest e\cosystem. Which of the following biomes is most likely to be affected by habitat fragmentation?

Correct A. Tropical rainforest

B. Temperate deciduous forest

C. Grassland

D. Desert

Correct Answer: A

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Question 8

A cell is in the process of undergoing mitosis. Which of the following stages is characterized by the condensation of chromatin into visible chromosomes?

Correct A. Prophase

B. Metaphase

C. Anaphase

D. Telophase

Correct Answer: A

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Question 9

A patient is experiencing symptoms of a hormonal imbalance. Which of the following glands is responsible for producing the hormone that regulates the body's response to stress?

A. Pituitary gland

B. Thyroid gland

Correct C. Adrenal gland

D. Pancreas

Correct Answer: C

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Question 10

A researcher is studying the effects of a new medication on the nervous system. Which of the following neurotransmitters is responsible for regulating muscle contraction?

Correct A. Acetylcholine

B. Dopamine

C. Serotonin

D. GABA

Correct Answer: A

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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'?

A. 0.36

Correct B. 0.64

C. 0.8

D. 0.16

Correct Answer: B

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Question 12

A 2.5-g sample of a compound containing only carbon and hydrogen is burned in a combustion apparatus. The volume of carbon dioxide produced is 2.5 liters at 25°C and 1 atm. What is the empirical formula of the compound?

Correct A. CH4

B. C2H6

C. C3H8

D. C4H10

Correct Answer: A

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Question 13

A cell is placed in a solution with a pH of 4.5. What is the concentration of hydrogen ions in the solution?

Correct A. 1.0 x 10^{-5} M

B. 1.0 x 10^{-4} M

C. 1.0 x 10^{-3} M

D. 1.0 x 10^{-2} M

Correct Answer: A

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Question 14

A population of rabbits is growing according to the \logistic growth equation. If the initial population is 100, the carrying capacity is 1000, and the growth rate is 0.5, what is the population after 5 years?

A. 500

B. 600

Correct C. 700

D. 800

Correct Answer: C

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Question 15

A 5.0-g sample of a compound containing only carbon and hydrogen is burned in a combustion apparatus. The volume of carbon dioxide produced is 3.5 liters at 25°C and 1 atm. What is the molecular formula of the compound?

A. C2H6

Correct B. C3H8

C. C4H10

D. C5H12

Correct Answer: B

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Question 16

In a population of 1000 individuals, 200 are infected with a disease that has a 20% mortality rate. If 50% of the infected individuals are asymptomatic, what is the expected number of deaths due to the disease?

A. 10

Correct B. 20

C. 30

D. 40

Correct Answer: B

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Question 17

A cell has a diameter of 10 μm and a volume of 1000 μm³. If the cell is spherical, what is its surface area?

Correct A. 100 μm²

B. 200 μm²

C. 300 μm²

D. 400 μm²

Correct Answer: A

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Question 18

A 2.5 L solution of 0.5 M NaCl is diluted to 5 L. What is the new concentration of NaCl?

Correct A. 0.25 M

B. 0.5 M

C. 0.75 M

D. 1 M

Correct Answer: A

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Question 19

A patient has a blood pressure of 120/80 mmHg. What is the diastolic pressure?

Correct A. 80 mmHg

B. 90 mmHg

C. 100 mmHg

D. 110 mmHg

Correct Answer: A

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Question 20

A 50 μg/mL solution of a protein is filtered through a 0.2 μm membrane. What is the expected concentration of the protein in the filtrate?

Correct A. 10 μg/mL

B. 20 μg/mL

C. 30 μg/mL

D. 40 μg/mL

Correct Answer: A

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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. 0.88

Correct Answer: A

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Question 22

A researcher is studying the effect of a new pesticide on the population of a certain species of insect. The pesticide has a 90% mortality rate on the insects. If the initial population of the insects is 1000, what is the expected population after 5 generations?

A. 100

B. 500

C. 250

Correct D. 125

Correct Answer: D

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Question 23

A plant has a genotype of 'Rr' for the flower color gene. If the plant is self-pollinated, 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 24

A species of bird has a wing span of 1.5 meters. If the bird is flying at a speed of 50 km/h, what is the angle of attack of the wing?

A. 10°

B. 20°

Correct C. 30°

D. 40°

Correct Answer: C

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Question 25

A researcher is studying the effect of a new fertilizer on the growth of a certain species of plant. The fertilizer has a 20% increase in growth rate. If the initial growth rate of the plant is 10 cm/day, what is the expected growth rate after 10 days?

A. 12 cm/day

B. 14 cm/day

C. 16 cm/day

Correct D. 18 cm/day

Correct Answer: D

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