POST UTME OSUSTECH 2021 Biology | Objective

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Question 1
In the context of osmoregulation, what is the primary function of the hypothalamus in regulating water balance in the body?
A. To secrete ADH (antidiuretic hormone) to increase water reabsorption in the kidneys
B. To stimulate the release of aldosterone to increase sodium reabsorption in the kidneys
C. To regulate the release of atrial natriuretic peptide to increase sodium excretion in the urine
Correct D. To control the release of vasopres\sin to increase water reabsorption in the kidneys

Correct Answer: D

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Question 2
A diagram of the nephron is shown below. What is the primary function of the loop of Henle in the process of osmoregulation?
Correct A. To increase the concentration of the filtrate by reabsorbing water and ions
B. To decrease the concentration of the filtrate by increa\sing the permeability of the collecting duct
C. To regulate the release of ADH to increase water reabsorption in the kidneys
D. To control the release of atrial natriuretic peptide to increase sodium excretion in the urine

Correct Answer: A

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Question 3
A diagram of the xylem is shown below. What is the primary function of the xylem in the process of transport?
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 the release of auxins to increase cell elongation in the stem
D. To control the release of gibberellins to increase cell division in the roots

Correct Answer: A

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Question 4
A diagram of the eye is shown below. What is the primary function of the retina in the process of vision?
Correct A. To detect light and transmit signals to the brain
B. To regulate the release of melatonin to increase sleepiness
C. To control the release of dopamine to increase alertness
D. To increase the sensitivity of the eye to light

Correct Answer: A

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Question 5
A diagram of the cell cycle is shown below. What is the primary function of the G2 phase in the process of cell division?
Correct A. To prepare the cell for mitosis by replicating DNA
B. To regulate the release of cyclin-dep\endent kinases to increase cell growth
C. To control the release of checkpoint proteins to increase cell cycle arrest
D. To increase the sensitivity of the cell to DNA damage

Correct Answer: A

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Question 6
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 7
A researcher isolates a microorganism that exhibits antibiotic resis\tance. Which of the following is a likely mechanism underlying this resis\tance?
Correct A. Horizontal Gene Transfer
B. Vertical Gene Transfer
C. Mutation
D. Gene Expression

Correct Answer: A

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Question 8
A plant exhibits a characteristic known as apomixis. What is the primary reproductive mechanism underlying this phenomenon?
Correct A. Asexual Reproduction
B. Sexual Reproduction
C. Parthenogenesis
D. Endosymbiosis

Correct Answer: A

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Question 9
A patient presents with symptoms of a neuro\logical disorder. Which of the following is a likely consequence of damage to the hypothalamic-pituitary-adrenal axis?
A. Cushing's Syndrome
Correct B. Addison's Disease
C. Hypothyroidism
D. Hyperthyroidism

Correct Answer: B

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Question 10
A researcher studies the population dynamics of a species in a specific biome. Which of the following is a likely consequence of changes in the species' population size?
Correct A. Predator-Prey Cycles
B. Competition for Resources
C. Niche Partitioning
D. Eco\logical Succession

Correct Answer: A

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Question 11
In a closed e\cosystem, the rate of photosynthesis is directly proportional to the rate of respiration. What is the likely effect on the e\cosystem's energy balance if the rate of photosynthesis increases by 20%?
A. The energy balance is maintained
B. The energy balance is disrupted
C. The energy balance increases
Correct D. The energy balance decreases

Correct Answer: D

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Question 12
A population of rabbits is growing exponentially. If the initial population is 100 and the growth rate is 25% per year, what is the population after 5 years?
Correct A. 3125
B. 625
C. 125
D. 25

Correct Answer: A

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Question 13
In a typical human cell, the mitochondria are responsible for producing ATP through cellular respiration. What is the primary function of the mitochondria?
A. Protein synthesis
B. Cell signaling
Correct C. Energy production
D. Cell division

Correct Answer: C

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Question 14
A researcher is studying the effect of pH on the growth of a microorganism. The researcher observes that the microorganism grows best at a pH of 7. What is the likely reason for this observation?
Correct A. The microorganism is a neutralophile
B. The microorganism is a acidophile
C. The microorganism is a alkalophile
D. The microorganism is a halophile

Correct Answer: A

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Question 15
A patient is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. The enzyme is responsible for breaking down a particular type of sugar. What is the likely effect on the patient's body if the enzyme is not produced?
A. The patient will experience a decrease in blood sugar levels
Correct B. The patient will experience an increase in blood sugar levels
C. The patient will experience a decrease in insulin levels
D. The patient will experience an increase in insulin levels

Correct Answer: B

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Question 16
In the context of evolutionary theories, what is the primary mechanism driving the adaptation of species to their environments?
Correct A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation

Correct Answer: A

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Question 17
A plant cell is placed in a solution with a high concentration of sucrose. What will happen to the cell's turgor pressure?
Correct A. Increase
B. Decrease
C. Remain the same
D. Become negative

Correct Answer: A

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Question 18
A diagram of the human kidney is shown below. What is the primary function of the structure labeled 'A'?
Correct A. Filtering waste from the blood
B. Regulating blood pressure
C. Producing hormones
D. Absorbing nutrients

Correct Answer: A

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Question 19
A population of rabbits is introduced to a new island. Over time, the population grows exponentially. What is the primary factor driving this growth?
A. Availability of food
Correct B. Lack of predators
C. Genetic variation
D. Environmental factors

Correct Answer: B

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Question 20
A diagram of the water cycle is shown below. What is the primary mechanism driving the movement of water from the ocean to the atmosphere?
Correct A. Evaporation
B. Condensation
C. Precipitation
D. Runoff

Correct Answer: A

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Question 21
In the context of hormonal coordination, what is the primary function of the hypothalamus?
A. Regulation of body temperature
B. Control of hunger and thirst
Correct C. Stimulation of the pituitary gland
D. Regulation of sleep-wake cycles

Correct Answer: C

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Question 22
A patient with a damaged sense organ is unable to perceive a specific type of stimulus. Which of the following sense organs is most likely affected?
A. Eye
Correct B. Ear
C. Nose
D. Tongue

Correct Answer: B

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Question 23
A microorganism is capable of cau\sing disease in humans. Which of the following characteristics is most likely responsible for its pathogenicity?
Correct A. Ability to produce toxins
B. Ability to invade host cells
C. Ability to evade host immune system
D. Ability to form biofilms

Correct Answer: A

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Question 24
Asexual reproduction involves the production of offspring without the involvement of gametes. Which of the following organisms is an example of asexual reproduction?
Correct A. Bacteria
B. Fungi
C. Plants
D. Animals

Correct Answer: A

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Question 25
The process of gas exchange in the lungs involves the diffusion of oxygen and carbon dioxide across the alveolar-capillary membrane. Which of the following factors is most likely to affect the rate of gas exchange?
A. Partial pressure of oxygen
B. Partial pressure of carbon dioxide
C. Surface area of alveoli
Correct D. Thickness of alveolar-capillary membrane

Correct Answer: D

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