Practice Post UTME GREENFIELD UNIVERSITY biology 2018 Past Questions

Question 1

In the process of osmoregulation, what is the primary mechanism by which the kidneys regulate the concentration of ions in the blood?

Correct A. Active transport of ions across the renal tubules

B. Passive diffusion of ions across the renal tubules

C. Excretion of excess ions through the urine

D. Reabsorption of ions from the filtrate

Correct Answer: A

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Question 2

A 35-year-old patient is diagnosed with type 2 diabetes mellitus. Which of the following is a characteristic feature of the disease?

Correct A. Hyperglycemia due to insulin deficiency

B. Hypoglycemia due to insulin excess

C. Hyperinsulinemia due to insulin resis\tance

D. Hypoinsulinemia due to insulin deficiency

Correct Answer: A

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Question 3

A diagram of the human digestive system is shown below. Identify the part labeled A.

A. Esophagus

Correct B. Stomach

C. Small intestine

D. Large intestine

Correct Answer: B

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Question 4

A 25-year-old athlete is experiencing muscle cramps and weakness. Which of the following is a possible cause?

A. Dehydration due to inadequate fluid intake

Correct B. Electrolyte imbalance due to excessive sweating

C. Muscle fatigue due to overtraining

D. Infection due to bacterial contamination

Correct Answer: B

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Question 5

A diagram of the human nervous system is shown below. Identify the part labeled B.

A. Brain

Correct B. Spinal cord

C. Cerebellum

D. Medulla oblongata

Correct Answer: B

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Question 6

In a tropical rainforest e\cosystem, the primary consumers are primarily herbivores that feed on the abundant plant life. Which of the following adaptations would be most beneficial for these herbivores to survive in this environment?

A. Large body size to intimidate predators

Correct B. Specialized digestive system to break down cellulose in plant cell walls

C. Camouflage to avoid detection by predators

D. Strong legs for rapid escape from predators

Correct Answer: B

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Question 7

A species of bird has a unique mating ritual where the male bird builds an elaborate nest and performs a complex courtship dance to attract a female. Which of the following evolutionary pressures would most likely lead to the development of this mating ritual?

A. Predation pressure leading to increased competition for mates

B. Resource scarcity leading to increased competition for mates

C. Genetic drift leading to random changes in mating behavior

Correct D. Sexual selection leading to increased competition for mates

Correct Answer: D

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Question 8

In a human kidney, the nephrons are responsible for filtering waste and excess fluids from the blood. Which of the following structures is responsible for the reabsorption of glu\cose from the filtrate back into the bloodstream?

Correct A. Proximal convoluted tubule

B. Distal convoluted tubule

C. Loop of Henle

D. Collecting duct

Correct Answer: A

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Question 9

A species of fish has a unique adaptation that allows it to survive in low-oxygen environments. Which of the following physio\logical changes would most likely be responsible for this adaptation?

A. Increased myoglobin levels to store oxygen

B. Increased hemoglobin levels to increase oxygen-carrying capacity

C. Increased mitochondrial density to increase energy production

Correct D. Increased anaerobic metabolism to produce energy without oxygen

Correct Answer: D

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Question 10

A species of plant has a unique adaptation that allows it to survive in environments with high levels of salt. Which of the following physio\logical changes would most likely be responsible for this adaptation?

A. Increased salt excretion through the roots

B. Increased salt storage in the leaves

Correct C. Increased salt tolerance through the use of specialized enzymes

D. Increased salt avoidance through the use of specialized roots

Correct Answer: C

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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?

Correct A. 0.36

B. 0.64

C. 0.16

D. 0.24

Correct Answer: A

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Question 12

A plant with the genotype 'AaBb' is crossed with a plant with the genotype 'AaBb'. What is the probability that the offspring will have the genotype 'AABB'?

A. 0.25

Correct B. 0.5

C. 0.75

D. 0.9

Correct Answer: B

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Question 13

A diagram of the human respiratory system is shown below.

A. The trachea is a tube that connects the lungs to the mouth.

B. The diaphragm is a muscle that separates the chest cavity from the abdominal cavity.

Correct C. The lungs are organs that are responsible for exchanging oxygen and carbon dioxide.

D. The trachea is a tube that connects the lungs to the nose.

Correct Answer: C

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Question 14

A diagram of the human excretory system is shown below.

Correct A. The kidneys are organs that filter waste from the blood.

B. The ureters are tubes that connect the kidneys to the bladder.

C. The bladder is an organ that stores urine.

D. The kidneys are organs that produce urine.

Correct Answer: A

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Question 15

A diagram of the human sense organ is shown below.

A. The cornea is the transparent outer layer of the eye.

B. The retina is the innermost layer of the eye.

Correct C. The eye is the sense organ that detects light.

D. The cornea is the innermost layer of the eye.

Correct Answer: C

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Question 16

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'?

Correct A. 0.64

B. 0.36

C. 0.16

D. 0.04

Correct Answer: A

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Question 17

A researcher is studying the effect of temperature on the rate of respiration in plants. Which of the following is a correct statement about the relationship between temperature and respiration rate?

A. Respiration rate increases with increa\sing temperature.

B. Respiration rate decreases with increa\sing temperature.

C. Respiration rate remains cons\tant with increa\sing temperature.

Correct D. Respiration rate increases up to a certain temperature and then decreases.

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 'C'?

A. To focus light on the retina.

Correct B. To regulate the amount of light entering the eye.

C. To produce tears.

D. To detect motion.

Correct Answer: B

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Question 19

A population of a certain species of bird is growing exponentially. If the initial population size is 100 and the growth rate is 20% per year, what will be the population size after 5 years?

A. 1000

B. 2000

C. 4000

Correct D. 8000

Correct Answer: D

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Question 20

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

A. To filter the air.

B. To warm the air.

Correct C. To exchange gases.

D. To expand and contract during breathing.

Correct Answer: C

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Question 21

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'?

Correct A. 0.6

B. 0.4

C. 0.8

D. 0.2

Correct Answer: A

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Question 22

A researcher isolates a bacterium that exhibits antibiotic resis\tance. The bacterium's DNA is analyzed, and a point mutation is found in the gene encoding the target protein of the antibiotic. What type of mutation is this?

A. Frameshift mutation

Correct B. Point mutation

C. Deletion

D. Insertion

Correct Answer: B

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Question 23

A diagram shows a cross-section of a plant root. The xylem is located on the outside of the root, and the phloem is located on the inside. What is the primary function of the xylem in this region?

Correct A. Transporting water and minerals from the roots to the leaves

B. Storing food and nutrients

C. Supporting the structure of the root

D. Regulating the rate of transpiration

Correct Answer: A

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Question 24

A researcher is studying the population dynamics of a species of rabbit. The population growth rate is modeled by the \logistic equation dP/dt = rP\( 1-P/K \), where P is the population size, r is the intrinsic growth rate, and K is the carrying capacity. What is the value of P when the population growth rate is zero?

A. K/2

Correct B. K

C. 2K

D. 0

Correct Answer: B

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Question 25

A diagram shows a simple harmonic motion of a mass-spring system. The amplitude of the motion is 5 cm, and the angular frequency is 2 rad/s. What is the maximum velocity of the mass?

A. 10 cm/s

Correct B. 20 cm/s

C. 5 cm/s

D. 2 cm/s

Correct Answer: B

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