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POST UTME UNN 2020 Biology | Objective

Are you preparing for POST UTME UNN exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Biology (Objective) questions designed to simulate the real exam environment.

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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. 0.48

B. 0.36

C. 0.64

D. 0.52

Correct Answer: A

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Question 2

A diagram of the human kidney is shown below. What is the function of the renal pyramids?

A. To filter waste from the blood

B. To regulate blood pressure

Correct C. To concentrate urine

D. To produce hormones

Correct Answer: C

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Question 3

A plant cell is shown below. What is the function of the vacuole?

Correct A. To store water and nutrients

B. To synthesize proteins

C. To regulate cell growth

D. To maintain cell shape

Correct Answer: A

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Question 4

A diagram of the human digestive system is shown below. What is the function of the pancreas?

A. To break down proteins into amino acids

B. To break down carbohydrates into glu\cose

C. To break down fats into fatty acids

Correct D. To produce hormones

Correct Answer: D

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Question 5

A diagram of the human circulatory system is shown below. What is the function of the heart?

A. To pump blood to the lungs

B. To pump blood to the brain

C. To pump blood to the muscles

Correct D. To pump blood to the entire body

Correct Answer: D

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Question 6

A study on the genetic variation of a population found that the frequency of the dominant allele (A) is 0.6, while the frequency of the recessive allele (a) is 0.4. If the population size is 1000, what is the expected number of homozygous dominant individuals (AA)?

A. 320

Correct B. 360

C. 400

D. 440

Correct Answer: B

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Question 7

A researcher is studying the effect of pH on the growth of a microorganism. The researcher measures the growth of the microorganism at different pH levels and plots the data on a graph. Which of the following graphs best represents the relationship between pH and growth?

Correct A. A graph with a positive correlation between pH and growth

B. A graph with a negative correlation between pH and growth

C. A graph with no correlation between pH and growth

D. A graph with a U-shaped curve between pH and growth

Correct Answer: A

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Question 8

A cell is placed in a solution with a concentration of 0.1 M glu\cose. The cell has a permeability coefficient of 1.5 x 10^-6 cm/s. What is the rate of glu\cose uptake by the cell?

A. 1.0 x 10^-3 M/s

Correct B. 1.5 x 10^-3 M/s

C. 2.0 x 10^-3 M/s

D. 3.0 x 10^-3 M/s

Correct Answer: B

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Question 9

A hormone is released from the hypothalamus and travels to the pituitary gland. What is the name of the hormone?

A. Thyroid-stimulating hormone (TSH)

Correct B. Adrenocorticotropic hormone (ACTH)

C. Growth hormone (GH)

D. Prolactin (PRL)

Correct Answer: B

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Question 10

A microorganism is placed in a solution with a concentration of 0.01 M glu\cose. The microorganism has a permeability coefficient of 2.0 x 10^-6 cm/s. What is the rate of glu\cose uptake by the microorganism?

A. 1.0 x 10^-5 M/s

Correct B. 2.0 x 10^-5 M/s

C. 3.0 x 10^-5 M/s

D. 4.0 x 10^-5 M/s

Correct Answer: B

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Question 11

The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?

Correct A. Random mating

B. Genetic drift

C. Mutation

D. Genetic variation

Correct Answer: A

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Question 12

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

A. The plant cell will shrink

Correct B. The plant cell will swell

C. The plant cell will remain unchanged

D. The plant cell will burst

Correct Answer: B

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Question 13

Asexual reproduction in bacteria is primarily facilitated by which of the following processes?

Correct A. Binary fission

B. Mitosis

C. Meiosis

D. Budding

Correct Answer: A

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Question 14

The process of photosynthesis in plants involves the conversion of light energy into chemical energy. Which of the following is a byproduct of this process?

Correct A. Oxygen

B. Carbon dioxide

C. Water

D. Glu\cose

Correct Answer: A

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Question 15

The human body is composed of various systems, including the circulatory, respiratory, and nervous systems. Which of the following is a function of the circulatory system?

Correct A. Transportation of oxygen and nutrients

B. Removal of waste products

C. Regulation of body temperature

D. Production of hormones

Correct Answer: A

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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?

A. 0.36

Correct B. 0.64

C. 0.48

D. 0.72

Correct Answer: B

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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. 0.50

C. 0.75

D. 0.90

Correct Answer: A

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Question 18

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

A. Mitochondria

B. Chloroplast

Correct C. Nucleus

D. Vacuole

Correct Answer: C

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Question 19

A diagram of a human respiratory system is shown below. Identify the part labeled 'B'.

A. Trachea

Correct B. Lungs

C. Diaphragm

D. Bronchi

Correct Answer: B

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Question 20

A diagram of a human reproductive system is shown below. Identify the part labeled 'C'.

A. Testes

Correct B. Ovary

C. Uterus

D. Vagina

Correct Answer: B

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Question 21

A species of bacteria is known to reproduce asexually through a process called binary fission. What is the term for the stage in the bacterial life cycle where the cell divides into two identical daughter cells?

Correct A. Interphase

B. Prophase

C. Metaphase

D. Telophase

Correct Answer: A

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Question 22

A diagram shows a plant cell with a large central vacuole. What is the primary function of the vacuole in this cell?

A. Storage of nutrients and waste products

Correct B. Regulation of cell turgor pressure

C. Synthesis of proteins and other biomolecules

D. Maintenance of cell shape and structure

Correct Answer: B

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Question 23

A patient is diagnosed with a bacterial infection caused by a gram-positive bacterium. Which of the following antibiotics is most likely to be effective against this infection?

A. Penicillin

B. Ciprofloxacin

Correct C. Vancomycin

D. Amoxicillin

Correct Answer: C

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Question 24

A diagram shows a human kidney with a nephron. What is the primary function of the nephron in this organ?

A. Regulation of blood pressure

B. Maintenance of electrolyte balance

Correct C. Excretion of waste products

D. Production of hormones

Correct Answer: C

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Question 25

A patient is experiencing respiratory distress due to a severe case of asthma. Which of the following medications is most likely to be prescribed to alleviate this condition?

Correct A. Albuterol

B. Ipratropium bromide

C. Montelukast

D. Prednisone

Correct Answer: A

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