POST UTME BABCOCK UNIVERSITY 2023 Biology | Objective

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Question 1 View Details
In a tropical rainforest e\cosystem, what is the primary role of the decomposer community?
A. To produce organic compounds through photosynthesis
Correct B. To break down dead plant and animal matter into simpler subs\tances
C. To form symbiotic relationships with other organisms
D. To regulate the water cycle

Correct Answer: B

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Question 2 View Details
A plant cell is placed in a solution containing 0.1 M glu\cose. If the cell membrane is selectively permeable, what will happen to the concentration of glu\cose inside the cell?
A. The concentration of glu\cose will increase
B. The concentration of glu\cose will decrease
Correct C. The concentration of glu\cose will remain the same
D. The cell will undergo osmosis

Correct Answer: C

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Question 3 View Details
A geneticist wants to study the inheri\tance of a specific trait in a population of pea plants. Which type of genetic cross would be most appropriate?
Correct A. Monohybrid cross
B. Dihybrid cross
C. Test cross
D. Backcross

Correct Answer: A

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Question 4 View Details
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
Correct A. To focus light onto the retina
B. To regulate the amount of light entering the eye
C. To detect movement
D. To produce tears

Correct Answer: A

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Question 5 View Details
A diagram of the human respiratory system is shown below. What is the function of the part labeled 'B'?
Correct A. To exchange oxygen and carbon dioxide
B. To regulate the amount of air entering the lungs
C. To detect odors
D. To produce mucus

Correct Answer: A

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Question 6 View Details
In asexual reproduction, what is the primary mechanism by which genetic variation is introduced?
A. Mutation
Correct B. Genetic recombination
C. Gene duplication
D. Gene deletion

Correct Answer: B

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Question 7 View Details
In the context of eco\logical succession, what is the term for the initial stage of primary succession where no vegetation exists?
Correct A. Pioneer species
B. Colonization
C. Stabilization
D. Climax community

Correct Answer: A

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Question 8 View Details
In the process of photosynthesis, what is the overall equation for the conversion of light energy into chemical energy?
Correct A. \( 6CO_2 + 6H_2O + light \rightarrow C_6H_{12}O_6 + 6O_2 \)
B. \( 6CO_2 + 6H_2O + light \rightarrow C_6H_{12}O_6 + 6H_2O \)
C. \( 6CO_2 + 6H_2O + light \rightarrow C_6H_{12}O_6 + 6CO_2 \)
D. \( 6CO_2 + 6H_2O + light \rightarrow C_6H_{12}O_6 + 6O_2 + 6H_2O \)

Correct Answer: A

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Question 9 View Details
In the context of respiration, what is the term for the process by which oxygen is transported from the lungs to the mitochondria?
Correct A. Diffusion
B. Osmosis
C. Active transport
D. Passive transport

Correct Answer: A

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Question 10 View Details
In the context of excretion, what is the term for the process by which the kidneys filter waste products from the blood?
Correct A. Glomerular filtration
B. Tubular reabsorption
C. Tubular secretion
D. Perfusion

Correct Answer: A

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Question 11 View Details
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. What is the expected frequency of the genotype AA in the next generation?
Correct A. 0.36
B. 0.48
C. 0.64
D. 0.72

Correct Answer: A

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Question 12 View Details
A plant with a mutation in the chloroplast DNA has a reduced ability to undergo photosynthesis. Which of the following organelles is responsible for photosynthesis?
A. Mitochondria
Correct B. Chloroplast
C. Nucleus
D. Vacuole

Correct Answer: B

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Question 13 View Details
A patient is diagnosed with a genetic disorder that affects the production of a specific enzyme. Which of the following types of genetic variation is most likely responsible for this disorder?
Correct A. Point mutation
B. Frameshift mutation
C. Deletion
D. Insertion

Correct Answer: A

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Question 14 View Details
A researcher is studying the effect of a new medication on the respiratory system. Which of the following organs is responsible for gas exchange?
Correct A. Lungs
B. Trachea
C. Bronchi
D. Diaphragm

Correct Answer: A

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Question 15 View Details
A patient is experiencing difficulty regulating their body temperature. Which of the following systems is responsible for thermoregulation?
A. Nervous system
Correct B. Endocrine system
C. Circulatory system
D. Integumentary system

Correct Answer: B

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Question 16 View Details
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. 0.16
B. 0.36
Correct C. 0.64
D. 0.84

Correct Answer: C

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Question 17 View Details
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. 0.5
C. 0.75
D. 0.9

Correct Answer: A

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Question 18 View Details
A diagram of a plant's root system is shown below. What is the name of the part labeled 'A'?
Correct A. Taproot
B. Fibrous root
C. Adventitious root
D. Lateral root

Correct Answer: A

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Question 19 View Details
A diagram of a human eye is shown below. What is the name of the part labeled 'B'?
A. Cornea
Correct B. Iris
C. Lens
D. Retina

Correct Answer: B

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Question 20 View Details
A diagram of a human heart is shown below. What is the name of the part labeled 'C'?
A. Atrium
B. Ventricle
Correct C. Septum
D. Valve

Correct Answer: C

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Question 21 View Details
In the context of evolutionary theory, what is the primary mechanism driving the adaptation of populations to changing environments?
Correct A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation

Correct Answer: A

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Question 22 View Details
A species of bird is found in a specific region of the world. Which of the following classifications would be most appropriate for this species?
A. Kingdom Animalia
B. Phylum Chordata
Correct C. Class Aves
D. Order Passeriformes

Correct Answer: C

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Question 23 View Details
In a tropical rainforest e\cosystem, what is the primary role of the decomposers?
A. Primary Producers
B. Primary Consumers
Correct C. Decomposers
D. Omnivores

Correct Answer: C

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Question 24 View Details
A plant cell has a high concentration of solutes in its cytoplasm. What is the primary mechanism by which the cell maintains water balance?
Correct A. Osmosis
B. Active Transport
C. Passive Transport
D. Diffusion

Correct Answer: A

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Question 25 View Details
A species of fish reproduces through a process called hermaphroditism. What is the primary advantage of this reproductive strategy?
Correct A. Increased Genetic Diversity
B. Reduced Genetic Diversity
C. Increased Reproductive Success
D. Reduced Reproductive Success

Correct Answer: A

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