POST UTME MADONNA UNIVERSITY 2020 Biology | Objective

Are you preparing for POST UTME MADONNA UNIVERSITY 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 eukaryotic cell, the process of mitosis involves the replication of DNA and the subsequent division of the cell into two daughter cells. Which of the following stages of mitosis 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 2
A certain species of plant has a photosynthetic rate of 10 mg CO2/m2/s. If the plant is exposed to light for 8 hours a day, and the light intensity is 500 W/m2, what is the total amount of CO2 fixed by the plant in a day?
A. 150,000 mg CO2
Correct B. 180,000 mg CO2
C. 200,000 mg CO2
D. 250,000 mg CO2

Correct Answer: B

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Question 3
A population of rabbits is growing exponentially, with a growth rate of 20% per year. If the initial population is 100 rabbits, what will be the population after 5 years?
A. 300 rabbits
B. 400 rabbits
Correct C. 500 rabbits
D. 600 rabbits

Correct Answer: C

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Question 4
A certain species of bird has a wingspan 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. 15^\circ
Correct B. 20^\circ
C. 25^\circ
D. 30^\circ

Correct Answer: B

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Question 5
A certain species of plant has a root system that is adapted to absorb water from the soil. Which of the following structures is responsible for the absorption of water by the plant?
Correct A. A
B. B
C. C
D. D

Correct Answer: A

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Question 6
In a diploid cell, what is the ratio of heterozygous to homozygous genotypes for a \single gene locus?
A. 1:1
Correct B. 2:1
C. 3:1
D. 4:1

Correct Answer: B

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Question 7
A researcher isolates a new species of bacteria that exhibits antibiotic resis\tance. Which of the following is a likely mechanism of resis\tance?
A. Efflux pumps
B. Enzymatic degradation
Correct C. Target modification
D. Cell membrane alteration

Correct Answer: C

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Question 8
A plant cell is placed in a solution with a high concentration of sucrose. What is the expected outcome?
Correct A. Water uptake and cell expansion
B. Water loss and cell shrinkage
C. No change in cell size
D. Cell lysis

Correct Answer: A

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Question 9
A diagram shows a cross-section of a root hair cell. Which of the following structures is responsible for the absorption of water?
Correct A. Vacuole
B. Plasmodesmata
C. Tonoplast
D. Cell wall

Correct Answer: A

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Question 10
A diagram shows a simplified representation of the electron transport chain. Which of the following is the primary function of Complex III?
Correct A. Proton pumping
B. Electron transfer
C. ATP synthesis
D. Electron leakage

Correct Answer: A

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Question 11
In the context of heredity and variation, what is the primary function of the centromere in a eukaryotic chromosome?
Correct A. To facilitate the separation of sister chromatids during mitosis
B. To regulate the replication of the chromosome
C. To ensure the accurate transmission of genetic information from one generation to the next
D. To control the expression of genes

Correct Answer: A

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Question 12
A diagram of the human eye is shown below. Identify the part labeled A.
Correct A. Cornea
B. Iris
C. Retina
D. Lens

Correct Answer: A

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Question 13
In the context of respiration and gas exchange, what is the primary function of the alveoli in the lungs?
Correct A. To facilitate the exchange of oxygen and carbon dioxide
B. To regulate the pH of the blood
C. To control the rate of breathing
D. To produce surfac\tant

Correct Answer: A

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Question 14
A diagram of the human reproductive system is shown below. Identify the part labeled B.
A. Testis
Correct B. Ovary
C. Uterus
D. Vagina

Correct Answer: B

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Question 15
In the context of coordination (nervous and hormonal), what is the primary function of the hypothalamus in the brain?
A. To regulate body temperature
B. To control hunger and thirst
Correct C. To produce hormones that stimulate the pituitary gland
D. To regulate sleep and wakefulness

Correct Answer: C

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Question 16
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. 0.64
B. 0.36
C. 0.16
D. 0.04

Correct Answer: A

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Question 17
A 2-year-old child is brought to the emergency room with a severe case of diarrhea. The child's stool is described as 'watery' and 'bloody'. Which of the following pathogens is most likely responsible for this condition?
A. Rotavirus
B. Norovirus
C. Escherichia coli
Correct D. Shigella dysenteriae

Correct Answer: D

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Question 18
A 30-year-old woman presents to her gyneco\logist with a history of irregular menstrual cycles. Her menstrual cycles are typically 40-50 days apart, and she experiences heavy bleeding during her periods. Which of the following hormones is most likely responsible for her condition?
A. Estrogen
B. Progesterone
C. Follicle-stimulating hormone (FSH)
Correct D. Luteinizing hormone (LH)

Correct Answer: D

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Question 19
A 40-year-old man is diagnosed with prostate cancer. His prostate-specific antigen (PSA) levels are elevated, and a biopsy confirms the presence of cancer cells. Which of the following types of cancer cells is most likely responsible for his condition?
Correct A. Adenocarcinoma
B. Squamous cell carcinoma
C. Small cell carcinoma
D. Large cell carcinoma

Correct Answer: A

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Question 20
A 25-year-old woman is diagnosed with a rare genetic disorder characterized by an inability to break down certain amino acids. Which of the following enzymes is most likely deficient in her condition?
Correct A. Phenylalanine hydroxylase
B. Tyro\sinase
C. Albinism
D. Cystinuria

Correct Answer: A

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Question 21
In a population of 1000 individuals, 70% have the dominant allele for brown eye color (B), while 30% have the recessive allele (b). If two individuals with brown eye color are randomly selected for a study, what is the probability that they will both have brown eye color?
Correct A. 0.49
B. 0.51
C. 0.7
D. 0.9

Correct Answer: A

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Question 22
A plant cell has a cell wall made of cellulose, a plasma membrane, and a large central vacuole. Which of the following is NOT a characteristic of plant cells?
A. Cell wall made of cellulose
B. Plasma membrane
C. Large central vacuole
Correct D. Mitochondria

Correct Answer: D

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Question 23
A diagram of a plant's xylem and phloem is shown below. What is the primary function of the xylem?
Correct A. Transporting water and minerals
B. Transporting sugars and amino acids
C. Producing energy through photosynthesis
D. Regulating temperature

Correct Answer: A

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Question 24
A diagram of a cell's mitotic spindle is shown below. What is the primary function of the mitotic spindle?
Correct A. Separating chromosomes during cell division
B. Producing energy through cellular respiration
C. Regulating cell growth and differentiation
D. Transporting subs\tances across the cell membrane

Correct Answer: A

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Question 25
A diagram of a plant's stomata is shown below. What is the primary function of the stomata?
Correct A. Regulating water loss through transpiration
B. Producing energy through photosynthesis
C. Transporting sugars and amino acids
D. Regulating temperature

Correct Answer: A

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