Practice Post UTME UNN biology 2022 Past Questions

Question 1

In a population of 1000 individuals, the frequency of the dominant allele is 0.6. What is the expected frequency of the recessive allele?

Correct A. 0.4

B. 0.2

C. 0.8

D. 0.1

Correct Answer: A

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Question 2

A 2-year-old child is diagnosed with a rare genetic disorder. The child's parents are both carriers of the recessive allele. What is the probability that the child will be affected?

Correct A. 0.25

B. 0.5

C. 0.75

D. 0.9

Correct Answer: A

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Question 3

A researcher is studying the effect of a new medication on blood pressure. The data shows a significant decrease in blood pressure after treatment. What type of statistical analysis would be most appropriate to use?

A. t-test

B. ANOVA

Correct C. Regression analysis

D. Chi-square test

Correct Answer: C

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Question 4

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 5

A researcher is studying the effect of pH on enzyme activity. The data shows a significant increase in enzyme activity at a pH of 7. What type of graph would be most appropriate to use to represent this data?

A. Bar graph

Correct B. Line graph

C. Scatter plot

D. Histogram

Correct Answer: B

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Question 6

In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope. What is the name of the stage during which the nuclear envelope breaks down?

Correct A. Prophase

B. Metaphase

C. Anaphase

D. Telophase

Correct Answer: A

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Question 7

The process of osmoregulation in animals involves the regulation of water and salt balance in the body. What is the name of the organ responsible for excreting excess salt in humans?

Correct A. Kidneys

B. Liver

C. Pancreas

D. Skin

Correct Answer: A

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Question 8

The sense organ responsible for detecting changes in light intensity is the

Correct A. Eye

B. Ear

C. Nose

D. Tongue

Correct Answer: A

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Question 9

The process of asexual reproduction in which a new individual is produced from a part of the parent's body is called

Correct A. Budding

B. Fission

C. Regeneration

D. Parthenogenesis

Correct Answer: A

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Question 10

The diagram below represents a cross-section of a plant root. Identify the part labeled 'A'

Correct A. Root hair

B. Stem

C. Leaf

D. Xylem

Correct Answer: A

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Question 11

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 'RR'?

A. 0.36

Correct B. 0.64

C. 0.44

D. 0.56

Correct Answer: B

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Question 12

A 2.0 L flask contains 1.0 mol of an ideal gas at 27°C. If 1.0 mol of another ideal gas is added to the flask, what is the new pressure of the mixture?

A. 1.5 atm

B. 2.0 atm

Correct C. 2.5 atm

D. 3.0 atm

Correct Answer: C

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Question 13

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 14

A solution contains 0.1 M NaCl and 0.1 M glu\cose. What is the total osmotic pressure of the solution at 25°C?

A. 1.0 atm

B. 1.5 atm

C. 2.0 atm

Correct D. 2.5 atm

Correct Answer: D

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Question 15

A 5.0 L flask contains 2.0 mol of an ideal gas at 27°C. If the gas is expanded to a volume of 10.0 L, what is the new pressure of the gas?

A. 0.25 atm

Correct B. 0.5 atm

C. 0.75 atm

D. 1.0 atm

Correct Answer: B

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Question 16

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 'RR'?

Correct A. 0.4

B. 0.6

C. 0.8

D. 0.2

Correct Answer: A

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Question 17

A researcher is studying the effect of light intensity on the rate of photosynthesis in a sample of Elodea canadensis. Which of the following graphs best represents the relationship between light intensity and the rate of photosynthesis?

A. A

Correct B. B

C. C

D. D

Correct Answer: B

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Question 18

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

Correct A. 10^{-4.5}

B. 10^{-5}

C. 10^{-6}

D. 10^{-7}

Correct Answer: A

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Question 19

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

A. 500

B. 750

C. 900

Correct D. 1000

Correct Answer: D

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Question 20

A researcher is studying the effect of temperature on the rate of enzyme-catalyzed reactions. Which of the following graphs best represents the relationship between temperature and the rate of reaction?

A. A

Correct B. B

C. C

D. D

Correct Answer: B

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Question 21

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 22

A diagram of the human eye is shown below. 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 23

In a population of 1000 individuals, 20% are homozygous dominant, 40% are heterozygous, and 40% are homozygous recessive. What is the frequency of the recessive allele?

A. 0.2

B. 0.4

Correct C. 0.6

D. 0.8

Correct Answer: C

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Question 24

A diagram of the water cycle is shown below. Which process is responsible for the formation of clouds?

A. Evaporation

Correct B. Condensation

C. Precipitation

D. Runoff

Correct Answer: B

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Question 25

In a population of 100 individuals, the frequency of the dominant allele is 0.8. What is the frequency of the recessive allele?

A. 0.1

B. 0.2

C. 0.3

Correct D. 0.4

Correct Answer: D

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