POST UTME WELLSPRING UNIVERSITY 2023 Biology | Objective

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Question 1
In the context of hormonal coordination, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?
A. Regulation of body temperature
B. Stimulation of the immune system
Correct C. Response to stress and regulation of the body's metabolic processes
D. Inhibition of the reproductive system

Correct Answer: C

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Question 2
A researcher is studying the growth and regulation of a population of bacteria. Which of the following best describes the relationship between the rate of growth and the carrying capacity of the environment?
A. Directly proportional
B. Inversely proportional
C. No relationship
Correct D. Exponentially related

Correct Answer: D

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Question 3
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 re\fract light entering the eye
C. To detect changes in light intensity
D. To regulate the amount of light entering the eye

Correct Answer: A

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Question 4
A species of bird has a beak shape that is well-suited for cracking open nuts. What is the primary mechanism by which this adaptation has evolved?
Correct A. Natural selection
B. Genetic drift
C. Gene flow
D. Mutation

Correct Answer: A

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Question 5
A researcher is studying the classification of living things. Which of the following is a characteristic of the domain Archaea?
A. Cell wall composed of peptidoglycan
B. Cell membrane composed of cholesterol
Correct C. Lack of a true nucleus
D. Presence of a flagellum

Correct Answer: C

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Question 6
The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. What is the term for the change in allele frequency in a population over time?
A. Mutation
B. Genetic drift
C. Gene flow
Correct D. Natural selection

Correct Answer: D

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Question 7
A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?
Correct A. Photosynthesis
B. Respiration
C. Transpiration
D. Osmosis

Correct Answer: A

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Question 8
The process by which an organism's genetic information is passed from one generation to the next is called what?
A. Mutation
B. Genetic drift
C. Gene flow
Correct D. Heritability

Correct Answer: D

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Question 9
A diagram of a human digestive system is shown below. What is the function of the structure labeled 'B'?
A. Absorption of nutrients
Correct B. Digestion of proteins
C. Storage of water
D. Excretion of waste

Correct Answer: B

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Question 10
The process by which an organism's genetic information is altered by external factors is called what?
Correct A. Mutation
B. Genetic drift
C. Gene flow
D. Epigenetics

Correct Answer: A

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Question 11
In a population of 1000 individuals, 50% are heterozygous for the sickle cell gene, 30% are homozygous dominant, and 20% are homozygous recessive. What is the expected genotype and phenotype of the offspring of a heterozygous individual and a homozygous recessive individual?
A. Homozygous dominant, normal phenotype
B. Homozygous recessive, sickle cell anemia
Correct C. Heterozygous, sickle cell trait
D. Homozygous dominant, sickle cell anemia

Correct Answer: C

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Question 12
A 2.5 cm long xylem vessel has a diameter of 0.5 mm. If the vessel is filled with water, what is the volume of water in cubic centimeters?
Correct A. 0.125
B. 0.25
C. 0.5
D. 1

Correct Answer: A

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Question 13
A diagram shows a plant with 5 petals and 10 sepals. What is the name of the plant?
Correct A. Rose
B. Lily
C. Tulip
D. Daisy

Correct Answer: A

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Question 14
A 50-year-old man has a 10-year history of hypertension. His blood pressure is 180/100 mmHg. What is the name of the condition he has?
Correct A. Hypertension
B. Hypotension
C. Cardiac arrest
D. Heart failure

Correct Answer: A

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Question 15
A diagram shows a neuron with a d\endrite, cell body, and axon. What is the function of the d\endrite?
Correct A. To receive signals from other neurons
B. To transmit signals to other neurons
C. To synthesize neurotransmitters
D. To regulate muscle contraction

Correct Answer: A

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Question 16
In a population of 1000 individuals, 70% are heterozygous for the ABO blood group system, 20% are homozygous dominant, and 10% are homozygous recessive. What is the genotype of the individual that is homozygous recessive?
Correct A. aa
B. AA
C. Aa
D. AO

Correct Answer: A

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Question 17
A 2.5-liter solution contains 1.5 liters of ethanol and 0.5 liters of water. What is the mole \fraction of ethanol in the solution?
Correct A. 0.6
B. 0.7
C. 0.8
D. 0.9

Correct Answer: A

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Question 18
A plant with the genotype RrSs produces 50% red flowers and 50% white flowers. What is the genotype of the individual that produces only red flowers?
Correct A. RRSS
B. RrSs
C. RrSS
D. rrss

Correct Answer: A

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Question 19
A 5.0-liter solution contains 2.0 liters of ethanol and 3.0 liters of water. What is the mole \fraction of ethanol in the solution?
A. 0.4
B. 0.5
Correct C. 0.6
D. 0.7

Correct Answer: C

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Question 20
A plant with the genotype RrSs produces 75% red flowers and 25% white flowers. What is the genotype of the individual that produces only red flowers?
Correct A. RRSS
B. RrSs
C. RrSS
D. rrss

Correct Answer: A

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Question 21
In the context of blood transport systems, what is the primary function of the erythrocytes?
Correct A. To transport oxygen from the lungs to the tissues
B. To transport carbon dioxide from the tissues to the lungs
C. To transport nutrients from the digestive system to the tissues
D. To transport waste products from the tissues to the excretory organs

Correct Answer: A

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Question 22
A researcher is studying the effects of light on plant growth. Which of the following wavelengths of light is most likely to promote photosynthesis?
A. Red light \( 600-700 nm \)
Correct B. Blue light \( 400-500 nm \)
C. Green light \( 500-600 nm \)
D. Ultraviolet light \( 100-400 nm \)

Correct Answer: B

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Question 23
A population of rabbits 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
Correct C. 4000
D. 8000

Correct Answer: C

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Question 24
A researcher is studying the effects of pH on enzyme activity. Which of the following enzymes is most likely to be affected by a change in pH?
A. Lactase
B. Amylase
Correct C. Tryp\sin
D. Pep\sin

Correct Answer: C

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Question 25
A species of bird is migrating from its breeding grounds to its wintering grounds. Which of the following types of migration is most likely to occur?
A. Altitudinal migration
Correct B. Latitudinal migration
C. Longitudinal migration
D. Diurnal migration

Correct Answer: B

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