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POST UTME BOWEN UNIVERSITY 2021 Biology | Objective

Are you preparing for POST UTME BOWEN UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2021 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1

In the context of evolutionary theory, what is the primary mechanism by which natural selection acts on a population?

A. Genetic drift

B. Mutation

C. Gene flow

Correct D. Differential reproduction

Correct Answer: D

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Question 2

A plant has a xylem vessel with a diameter of 100 μm. If the xylem vessel is 10 cm long, what is the total cross-sectional area of the xylem vessel?

Correct A. 3.14 × 10^-4 cm^2

B. 3.14 × 10^-3 cm^2

C. 3.14 × 10^-2 cm^2

D. 3.14 × 10^-1 cm^2

Correct Answer: A

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Question 3

In a tropical rainforest, what is the primary role of the decomposer community?

A. Primary producers

B. Primary consumers

Correct C. Decomposers

D. Omnivores

Correct Answer: C

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Question 4

A cell has a surface area of 100 μm^2 and a volume of 1000 μm^3. What is the surface-to-volume ratio of the cell?

Correct A. 1:100

B. 1:10

C. 1:1

D. 10:1

Correct Answer: A

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Question 5

In the context of excretion, what is the primary function of the kidneys?

A. To regulate blood pressure

B. To regulate blood sugar levels

Correct C. To remove waste products from the blood

D. To regulate body temperature

Correct Answer: C

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Question 6

In the context of hormonal coordination, what is the primary function of the hypothalamus in regulating body temperature?

Correct A. To maintain a cons\tant body temperature through thermoregulation

B. To regulate the release of hormones that control appetite and satiety

C. To stimulate the release of hormones that control growth and development

D. To regulate the sleep-wake cycle

Correct Answer: A

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Question 7

A diagram of the human eye is shown below. What is the primary function of the ciliary muscles in this diagram?

Correct A. To change the shape of the lens

B. To regulate the amount of light entering the eye

C. To focus light on the retina

D. To detect movement

Correct Answer: A

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Question 8

In the context of excretion and osmoregulation, what is the primary function of the kidneys in regulating blood pressure?

A. To regulate the amount of water in the blood

B. To remove waste products from the blood

C. To regulate the amount of electrolytes in the blood

Correct D. To regulate blood pressure through the renin-angioten\sin-aldosterone system

Correct Answer: D

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Question 9

A diagram of the human heart is shown below. What is the primary function of the atrioventricular (AV) node in this diagram?

Correct A. To regulate the heartbeat

B. To pump blood from the atria to the ventricles

C. To regulate the amount of blood in the heart

D. To detect changes in blood pressure

Correct Answer: A

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Question 10

In the context of transport systems, what is the primary function of the xylem in plants?

Correct A. To transport water and minerals from the roots to the leaves

B. To transport sugars and other organic compounds from the leaves to the rest of the plant

C. To regulate the amount of water in the plant

D. To detect changes in light intensity

Correct Answer: A

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Question 11

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

A. To generate ATP through substrate-level phosphorylation

B. To produce NADH and FADH2

Correct C. To pump protons across the mitochondrial membrane

D. To reduce oxygen to water

Correct Answer: C

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Question 12

A researcher is studying the effect of pH on enzyme activity. Which of the following enzymes would be most sensitive to changes in pH?

A. Amylase

B. Lactase

Correct C. Pep\sin

D. Tryp\sin

Correct Answer: C

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Question 13

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 detect changes in light intensity

C. To regulate the amount of light entering the eye

D. To produce tears

Correct Answer: A

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Question 14

A plant is placed in a controlled environment with a cons\tant temperature and humidity. What is the primary factor that would affect the rate of photosynthesis?

Correct A. Light intensity

B. Temperature

C. Humidity

D. CO2 concentration

Correct Answer: A

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Question 15

A diagram of the human skeletal system is shown below. What is the function of the part labeled 'B'?

Correct A. To protect the brain

B. To produce blood cells

C. To store minerals

D. To facilitate movement

Correct Answer: A

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Question 16

In a photosynthetic pathway, which of the following electron carriers is responsible for the transfer of electrons from plastocyanin to the reaction center?

A. Ferredoxin

B. Plastocyanin

Correct C. Cytochrome b6f

D. Pheophytin

Correct Answer: C

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Question 17

A 25-year-old patient presents with symptoms of malabsorption, diarrhea, and weight loss. Stool examination reveals the presence of a flagellated protozoan. Which of the following is the most likely diagnosis?

Correct A. Giardiasis

B. Amoebiasis

C. Cryptosporidiosis

D. Isosporiasis

Correct Answer: A

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Question 18

A 35-year-old woman presents with a 2-year history of recurrent infections, including pneumonia and \sinusitis. Her neutrophil count is 200 cells/μL. Which of the following is the most likely diagnosis?

Correct A. Chronic Granulomatous Disease

B. Leukocyte Adhesion Deficiency

C. Myeloperoxidase Deficiency

D. G6PD Deficiency

Correct Answer: A

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Question 19

A 40-year-old man presents with a 5-year history of progressive shortness of breath and fatigue. His chest X-ray shows a large right-sided pleural effusion. Which of the following is the most likely diagnosis?

Correct A. Mesothelioma

B. Adenocarcinoma

C. Squamous Cell Carcinoma

D. Small Cell Carcinoma

Correct Answer: A

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Question 20

A 30-year-old woman presents with a 2-year history of recurrent episodes of abdominal pain, diarrhea, and weight loss. Her stool examination reveals the presence of a gram-negative rod. Which of the following is the most likely diagnosis?

Correct A. Salmonellosis

B. Shigellosis

C. Campylobacteriosis

D. Escherichia coli

Correct Answer: A

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Question 21

In a tropical rainforest e\cosystem, the primary consumers are primarily composed of which of the following groups?

Correct A. Herbivorous insects

B. Fruiting plants

C. Fungi

D. Decomposers

Correct Answer: A

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Question 22

The process of cellular respiration in plants involves which of the following stages?

A. Glycolysis, Pyruvate Oxidation, and the Citric Acid Cycle

B. Photosynthesis, Glycolysis, and the Citric Acid Cycle

Correct C. Glycolysis, the Citric Acid Cycle, and Oxidative Phosphorylation

D. Photosynthesis, Glycolysis, and Oxidative Phosphorylation

Correct Answer: C

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Question 23

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

Correct A. Root hair cell

B. Epidermal cell

C. Parenchyma cell

D. Xylem cell

Correct Answer: A

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Question 24

The process of mitosis in eukaryotic cells involves which of the following stages?

Correct A. Prophase, Metaphase, Anaphase, and Telophase

B. Interphase, Prophase, Metaphase, and Anaphase

C. Prophase, Metaphase, Anaphase, and Cytokinesis

D. Interphase, Prophase, Metaphase, and Telophase

Correct Answer: A

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Question 25

The diagram below represents a simple circuit. Identify the part labeled A.

Correct A. Positive terminal

B. Negative terminal

C. Resistor

D. Switch

Correct Answer: A

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