POST UTME BOWEN UNIVERSITY 2024 Biology | Objective

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Question 1
In the context of blood transport systems, what is the primary function of the erythrocyte membrane?
A. To regulate the movement of ions and nutrients across the membrane
B. To maintain the structural integrity of the cell
Correct C. To facilitate the exchange of gases between the blood and tissues
D. To synthesize hemoglobin

Correct Answer: C

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Question 2
A plant cell is placed in a solution with a high concentration of sucrose. What is the expected change in the cell's turgor pressure?
A. The cell will lose water and shrink
Correct B. The cell will gain water and swell
C. The cell will remain unchanged
D. The cell will burst due to increased pressure

Correct Answer: B

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Question 3
A diagram of the xylem tissue is shown below. What is the primary function of the tracheids?
Correct A. To transport water and minerals from the roots to the leaves
B. To store water and nutrients in the stem
C. To provide structural support to the plant
D. To regulate the opening and clo\sing of stomata

Correct Answer: A

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Question 4
A diagram of the human digestive system is shown below. What is the primary function of the pancreas?
A. To produce digestive enzymes that break down proteins
B. To produce digestive enzymes that break down carbohydrates
C. To produce digestive enzymes that break down fats
Correct D. To produce hormones that regulate blood sugar levels

Correct Answer: D

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Question 5
A diagram of the human respiratory system is shown below. What is the primary function of the diaphragm?
Correct A. To regulate the flow of air into the lungs
B. To regulate the flow of blood from the heart to the lungs
C. To regulate the flow of mucus from the lungs to the throat
D. To regulate the flow of air from the lungs to the throat

Correct Answer: A

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Question 6
In the context of hormonal coordination, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?
A. Regulation of body temperature
B. Maintenance of blood pressure
C. Stimulation of the immune system
Correct D. Response to stress and anxiety

Correct Answer: D

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Question 7
A diagram of the human eye is shown below. What is the primary function of the structure labeled 'A'?
Correct A. To focus light on the retina
B. To detect movement
C. To regulate pupil size
D. To produce tears

Correct Answer: A

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Question 8
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 amino acids from the leaves to the roots
C. To regulate gas exchange between the roots and the soil
D. To produce hormones that stimulate root growth

Correct Answer: A

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Question 9
A diagram of the human circulatory system is shown below. What is the primary function of the structure labeled 'B'?
A. To pump blood from the heart to the lungs
Correct B. To transport oxygenated blood from the lungs to the body
C. To regulate blood pressure
D. To produce hormones that stimulate heart growth

Correct Answer: B

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Question 10
In the context of eco\logy, what is the primary function of the producer level in a food web?
Correct A. To consume energy from the sun and convert it into chemical energy
B. To store energy in the form of fat and glycogen
C. To regulate the population size of other organisms
D. To produce waste products that pollute the environment

Correct Answer: A

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Question 11
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'?
A. 0.36
Correct B. 0.64
C. 0.8
D. 0.16

Correct Answer: B

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Question 12
A researcher is studying the effect of pH on the growth of E. coli. The graph below shows the growth of E. coli at different pH levels.
Correct A. The growth of E. coli is highest at pH 7.
B. The growth of E. coli is highest at pH 5.
C. The growth of E. coli is highest at pH 9.
D. The growth of E. coli is highest at pH 3.

Correct Answer: A

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Question 13
A population of rabbits is growing according to the \logistic growth equation \( \frac{dP}{dt} = rP \left\( 1 - \frac{P}{K} \right \). If the initial population is 100, the carrying capacity is 1000, and the growth rate is 0.2, what is the population after 10 years?
Correct A. 964.62
B. 1000
C. 900
D. 500

Correct Answer: A

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Question 14
A researcher is studying the effect of temperature on the growth of a microorganism. The graph below shows the growth of the microorganism at different temperatures.
Correct A. The growth of the microorganism is highest at 30°C.
B. The growth of the microorganism is highest at 40°C.
C. The growth of the microorganism is highest at 50°C.
D. The growth of the microorganism is highest at 60°C.

Correct Answer: A

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Question 15
A population of bacteria is growing according to the exponential growth equation \( P(t) = P_0 e^{rt} \). If the initial population is 100, the growth rate is 0.2, and the time is 10 years, what is the population?
Correct A. 220.36
B. 200
C. 250
D. 300

Correct Answer: A

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Question 16
In the context of cell division, what is the primary function of the spindle fibers during anaphase?
A. To separate the sister chromatids
B. To align the chromosomes at the metaphase plate
Correct C. To move the chromosomes to the poles of the cell
D. To repair damaged DNA

Correct Answer: C

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Question 17
A population of bacteria is growing exponentially. If the initial population is 100 cells and the population doubles every 2 hours, what is the population after 6 hours?
A. 1000
B. 2000
C. 4000
Correct D. 8000

Correct Answer: D

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Question 18
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 movement
C. To regulate pupil size
D. To produce tears

Correct Answer: A

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Question 19
A plant is placed in a solution with a high concentration of salt. What is the expected outcome?
A. The plant will grow taller
B. The plant will grow wider
Correct C. The plant will wilt and die
D. The plant will remain unaffected

Correct Answer: C

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Question 20
A diagram of the water cycle is shown below. What is the process labeled 'A'?
Correct A. Evaporation
B. Condensation
C. Precipitation
D. Runoff

Correct Answer: A

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Question 21
In a eukaryotic cell, the process of cell division that results in the production of four daughter cells is called
Correct A. Mitosis
B. Meiosis
C. Binary Fission
D. Endoreduplication

Correct Answer: A

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Question 22
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 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 process by which cells become specialized to perform specific functions is called
Correct A. Differentiation
B. Mitosis
C. Meiosis
D. Endoreduplication

Correct Answer: A

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Question 25
The diagram below shows a eukaryotic cell undergoing
Correct A. Mitosis
B. Meiosis
C. Endoreduplication
D. Binary Fission

Correct Answer: A

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