Practice post utme abu biology 2022 Past Questions

Question 1

In the context of osmoregulation, what is the primary function of the kidneys in maintaining electrolyte balance?

A. To regulate water levels in the body

Correct B. To maintain electrolyte balance by excreting excess ions

C. To regulate pH levels in the body

D. To regulate blood pressure

Correct Answer: B

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Question 2

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

Correct A. To focus light on the retina

B. To regulate the amount of light entering the eye

C. To detect color

D. To detect movement

Correct Answer: A

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Question 3

In the context of evolutionary theory, what is the term for the process by which a new species emerges from an existing one?

Correct A. Speciation

B. Adaptation

C. Mutation

D. Natural selection

Correct Answer: A

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Question 4

A diagram of a simple e\cosystem is shown below. What is the role of the part labeled 'B'?

A. To produce oxygen

Correct B. To consume oxygen

C. To produce food

D. To consume food

Correct Answer: B

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Question 5

In the context of osmoregulation, what is the term for the process by which the body maintains a stable concentration of electrolytes?

A. Osmosis

B. Diffusion

Correct C. Active transport

D. Passive transport

Correct Answer: C

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Question 6

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?

A. 0.16

B. 0.32

Correct C. 0.64

D. 0.8

Correct Answer: C

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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. 1

Correct Answer: A

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Question 8

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 signaling

Correct Answer: A

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Question 9

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

A. Filtering waste from the blood

B. Regulating blood pressure

Correct C. Producing urine

D. Regulating electrolyte balance

Correct Answer: C

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Question 10

A diagram of a human eye is shown below. What is the function of the structure labeled 'E'?

Correct A. Focu\sing light on the retina

B. Regulating pupil size

C. Producing tears

D. Regulating eye movement

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. 0.96

Correct Answer: B

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Question 12

A diagram shows a cross-section of a root hair cell. Identify the part labeled 'B'?

A. cell wall

Correct B. root hair

C. cell membrane

D. vacuole

Correct Answer: B

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Question 13

A 2.5 L flask contains 0.5 mol of an ideal gas at 298 K. What is the pressure of the gas?

Correct A. 1.01 x 10^5 Pa

B. 2.02 x 10^5 Pa

C. 3.03 x 10^5 Pa

D. 4.04 x 10^5 Pa

Correct Answer: A

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Question 14

A diagram shows a simple harmonic motion. Identify the part labeled 'C'?

A. spring

B. mass

Correct C. amplitude

D. displacement

Correct Answer: C

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Question 15

A 0.5 M solution of NaCl is prepared by dissolving 0.25 mol of NaCl in 0.5 L of water. What is the concentration of Cl- ions?

A. 0.5 M

Correct B. 0.25 M

C. 1.0 M

D. 1.5 M

Correct Answer: B

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Question 16

In asexual reproduction, what is the primary mechanism by which genetic variation is introduced?

A. Mutation

B. Genetic drift

C. Gene flow

Correct D. Genetic recombination

Correct Answer: D

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Question 17

In the e\cosystem of a tropical rainforest, what is the primary role of the decomposer population?

A. Primary producers

B. Herbivores

Correct C. Decomposers

D. Omnivores

Correct Answer: C

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Question 18

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

Correct A. To generate ATP

B. To produce NADH

C. To reduce oxygen

D. To increase pH

Correct Answer: A

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Question 19

In the classification of living organisms, what is the primary characteristic used to distinguish between prokaryotes and eukaryotes?

A. Cell wall composition

B. Cell membrane structure

Correct C. Presence of a nucleus

D. Metabolic processes

Correct Answer: C

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Question 20

In the human visual system, what is the primary function of the optic nerve?

Correct A. To transmit visual information to the brain

B. To regulate pupil size

C. To focus light on the retina

D. To produce tears

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. 0.64

B. 0.36

C. 0.48

D. 0.52

Correct Answer: A

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Question 22

A 2.5 cm long muscle fibre is stretched to 3.5 cm. What is the percentage increase in length?

A. 20%

Correct B. 40%

C. 60%

D. 80%

Correct Answer: B

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Question 23

A plant cell has a cell wall, a large central vacuole, and a small nucleus. What is the function of the cell wall?

A. To maintain the cell's shape

Correct B. To provide structural support

C. To regulate the movement of subs\tances

D. To synthesize proteins

Correct Answer: B

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Question 24

A 5.0 g sample of a subs\tance is dissolved in 25.0 cm³ of water. What is the concentration of the solution in g/dm³?

A. 0.2 g/dm³

Correct B. 0.4 g/dm³

C. 0.6 g/dm³

D. 0.8 g/dm³

Correct Answer: B

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Question 25

A diagram shows a plant with a root system and a shoot system. What is the function of the root system?

Correct A. To absorb water and nutrients

B. To produce glu\cose through photosynthesis

C. To support the plant's structure

D. To regulate the plant's temperature

Correct Answer: A

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