POST UTME PAN-ATLANTIC UNIVERSITY 2017 Biology | Objective

Are you preparing for POST UTME PAN-ATLANTIC UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2017 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In a tropical rainforest e\cosystem, what is the primary role of the emergent layer?
A. To provide shade and shelter for smaller animals
Correct B. To intercept and block sunlight, reducing photosynthesis in the forest floor
C. To serve as a habitat for epiphytes and other organisms
D. To act as a firebreak, preventing forest fires from spreading

Correct Answer: B

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Question 2
A patient is diagnosed with a rare genetic disorder characterized by an inability to synthesize the amino acid phenylalanine. Which of the following enzymes is deficient in this disorder?
Correct A. Phenylalanine hydroxylase
B. Tyro\sine aminotransferase
C. Dihydropteridine reductase
D. GTP cyclohydrolase

Correct Answer: A

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Question 3
A diagram of the human nervous system is shown below. Identify the part labeled 'A'.
Correct A. Cerebrum
B. Cerebellum
C. Brainstem
D. Spinal cord

Correct Answer: A

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Question 4
A researcher is studying the respiration of a plant. Which of the following is the primary function of the mitochondria in this process?
Correct A. To produce ATP through the citric acid cycle
B. To generate NADH and FADH2 through glycolysis
C. To produce oxygen through photosynthesis
D. To break down glu\cose through cellular respiration

Correct Answer: A

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Question 5
A diagram of the human respiratory system is shown below. Identify the part labeled 'B'.
A. Nose
Correct B. Trachea
C. Bronchi
D. Lungs

Correct Answer: B

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Question 6
In a xylem vessel, water and minerals are transported from the roots to the leaves through the process of
A. Transpiration
Correct B. Translocation
C. Osmosis
D. Diffusion

Correct Answer: B

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Question 7
The process by which cells divide to produce two daughter cells is called
Correct A. Mitosis
B. Meiosis
C. Binary Fission
D. Endosymbiosis

Correct Answer: A

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Question 8
The excretory system in humans consists of the
Correct A. Kidneys, Liver, and Skin
B. Lungs, Liver, and Skin
C. Kidneys, Liver, and Pancreas
D. Lungs, Liver, and Pancreas

Correct Answer: A

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Question 9
The process by which plants convert light energy into chemical energy is called
Correct A. Photosynthesis
B. Respiration
C. Transpiration
D. Translocation

Correct Answer: A

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Question 10
The genetic material in eukaryotic cells is organized into
Correct A. Chromosomes
B. Mitochondria
C. Ribosomes
D. Lysosomes

Correct Answer: A

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Question 11
In a tropical rainforest, the canopy layer is the most densely populated with species. What is the primary reason for this high biodiversity?
Correct A. High levels of rainfall and warm temperatures
B. Presence of a large number of primary consumers
C. Abundant sunlight and nutrient-rich soil
D. Low levels of predation and competition

Correct Answer: A

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Question 12
A neuron is stimulated by an action potential that travels along its axon. What is the primary mechanism by which the action potential is transmitted?
A. Diffusion of ions through the cell membrane
B. Active transport of ions through the cell membrane
C. Passive transport of ions through the cell membrane
Correct D. Electrical conduction through the axon

Correct Answer: D

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Question 13
A population of rabbits is growing exponentially. If the initial population is 100 and the growth rate is 20% per year, what is the population after 5 years?
A. 1000
B. 1200
Correct C. 1600
D. 2000

Correct Answer: C

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Question 14
A gene is expressed in a specific tissue type due to the presence of a specific transcription factor. What is the primary mechanism by which the transcription factor regulates gene expression?
Correct A. Direct binding to the promoter region
B. Indirect binding to the promoter region
C. Binding to a specific enhancer element
D. Binding to a specific silencer element

Correct Answer: A

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Question 15
A plant is placed in a controlled environment with a cons\tant temperature, humidity, and light intensity. What is the primary factor that determines the rate of photosynthesis?
A. Temperature
B. Humidity
Correct C. Light intensity
D. CO2 concentration

Correct Answer: C

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Question 16
In a tropical rainforest, the xylem tissue in the stem of a tree is responsible for transporting water and minerals from the roots to the leaves. What is the primary mechanism by which the xylem tissue achieves this transport?
Correct A. Transpiration pull
B. Root pressure
C. Capillary action
D. Osmosis

Correct Answer: A

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Question 17
A population of rabbits in a forest is growing exponentially. If the initial population is 100 and the growth rate is 20% per year, what will be the population after 5 years?
A. 1000
B. 2000
C. 4000
Correct D. 8000

Correct Answer: D

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Question 18
In a photosynthetic process, light energy is absorbed by pigments such as chlorophyll and converted into chemical energy. What is the primary pigment responsible for absorbing light energy in the blue-violet region of the visible spectrum?
Correct A. Chlorophyll a
B. Chlorophyll b
C. Phycocyanin
D. Phycoerythrin

Correct Answer: A

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Question 19
A diagram of a plant cell is shown below. Identify the organelle responsible for protein synthesis.
A. Nucleus
Correct B. Ribosome
C. Mitochondria
D. Endoplasmic reticulum

Correct Answer: B

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Question 20
A diagram of a human respiratory system is shown below. Identify the pathway by which air enters the lungs.
Correct A. Trachea
B. Bronchi
C. Alveoli
D. Diaphragm

Correct Answer: A

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Question 21
The xylem tissue in plants is responsible for transporting water and minerals from the roots to the leaves. Which of the following statements is true about the xylem?
A. It is a type of vascular tissue found in the phloem.
Correct B. It transports water and minerals from the roots to the leaves.
C. It is responsible for photosynthesis in the leaves.
D. It is a type of meristematic tissue found in the roots.

Correct Answer: B

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Question 22
The process of asexual reproduction in which a new individual is produced from a part of a parent's body is called?
A. Binary fission
Correct B. Budding
C. Fragmentation
D. Regeneration

Correct Answer: B

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Question 23
The theory of evolution by natural selection was first proposed by?
Correct A. Charles Darwin
B. Gregor M\endel
C. Jean-Baptiste Lamarck
D. Alfred Russel Wallace

Correct Answer: A

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Question 24
The sense organ responsible for detecting changes in light intensity is the?
Correct A. Eye
B. Ear
C. Nose
D. Mouth

Correct Answer: A

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Question 25
The xylem tissue in plants is responsible for transporting water and minerals from the roots to the leaves. Which of the following statements is true about the xylem?
A. It is a type of vascular tissue found in the phloem.
Correct B. It transports water and minerals from the roots to the leaves.
C. It is responsible for photosynthesis in the leaves.
D. It is a type of meristematic tissue found in the roots.

Correct Answer: B

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