POST UTME DELSU 2022 Biology | Objective

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Question 1 View Details
In the context of evolutionary theories, 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 2 View Details
A cell is placed in a hypertonic solution. What will happen to the cell?
Correct A. The cell will swell and eventually burst
B. The cell will shrink and lose water
C. The cell will remain unchanged
D. The cell will gain water and increase in size

Correct Answer: A

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Question 3 View Details
A population of bacteria is growing in a controlled environment. The population size is measured over time and plotted on a graph. What is the shape of the graph?
Correct A. Exponential growth
B. Linear growth
C. Logarithmic growth
D. Sigmoid growth

Correct Answer: A

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Question 4 View Details
A genetic disorder is caused by a mutation in a \single gene. What type of genetic variation is this?
Correct A. Point mutation
B. Frameshift mutation
C. Deletion
D. Insertion

Correct Answer: A

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Question 5 View Details
A diagram of a cell membrane is shown below. What is the function of the structure labeled 'A'?
Correct A. To regulate the movement of ions
B. To transport nutrients into the cell
C. To remove waste products from the cell
D. To maintain the cell's shape

Correct Answer: A

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Question 6 View Details
In a population of 1000 individuals, 70% are homozygous dominant (BB), 20% are heterozygous (Bb), and 10% are homozygous recessive (bb). What is the probability that two individuals chosen at random will have offspring with the BB genotype?
Correct A. 0.35
B. 0.45
C. 0.55
D. 0.65

Correct Answer: A

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Question 7 View Details
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth of E. coli at different pH levels and plots the data on a graph. Which of the following best describes the relationship between pH and E. coli growth?
A. Inversely proportional
Correct B. Directly proportional
C. No relationship
D. U-shaped

Correct Answer: B

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Question 8 View Details
A 2-year-old child is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. The child's parents are both carriers of the mutated gene. What is the probability that their next child will be affected by the disorder?
A. 0.25
Correct B. 0.50
C. 0.75
D. 0.90

Correct Answer: B

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Question 9 View Details
A researcher is studying the effect of temperature on the rate of photosynthesis in plants. The researcher measures the rate of photosynthesis at different temperatures and plots the data on a graph. Which of the following best describes the relationship between temperature and the rate of photosynthesis?
A. Inversely proportional
Correct B. Directly proportional
C. No relationship
D. U-shaped

Correct Answer: B

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Question 10 View Details
A 5-year-old child is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. The child's parents are both carriers of the mutated gene. What is the probability that their next child will be affected by the disorder?
A. 0.25
Correct B. 0.50
C. 0.75
D. 0.90

Correct Answer: B

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Question 11 View Details
In a tropical rainforest e\cosystem, the primary consumers are primarily herbivores that feed on the abundant plant life. Which of the following is a characteristic of the primary consumers in this e\cosystem?
A. They are primarily carnivores
B. They are primarily omnivores
Correct C. They are primarily herbivores
D. They are primarily detritivores

Correct Answer: C

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Question 12 View Details
A plant hormone that promotes cell elongation and cell division is
Correct A. Auxin
B. Ethylene
C. Abscisic acid
D. Gibberellin

Correct Answer: A

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Question 13 View Details
A diagram of a typical xylem vessel is shown below. What is the function of the pits in the xylem vessel?
A. To increase the surface area for water absorption
B. To allow for the exchange of gases
Correct C. To provide a pathway for water and minerals to move from one xylem vessel to another
D. To store food and water

Correct Answer: C

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Question 14 View Details
The process by which the body regulates the amount of water in the blood is called
A. Osmosis
B. Diffusion
C. Active transport
Correct D. Regulation of water balance

Correct Answer: D

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Question 15 View Details
A diagram of a typical blood vessel is shown below. What is the function of the \endothelium in the blood vessel?
A. To regulate the amount of water in the blood
B. To provide a pathway for the exchange of gases
Correct C. To line the blood vessel and prevent blood clotting
D. To store food and water

Correct Answer: C

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Question 16 View Details
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. 0.2
B. 0.4
Correct C. 0.6
D. 0.8

Correct Answer: C

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Question 17 View Details
A 2.5 L flask contains a mixture of O2 and N2 at 25°C and 1 atm. If 0.5 L of N2 is removed, what is the new partial pressure of O2?
A. 0.5 atm
B. 1 atm
Correct C. 1.5 atm
D. 2 atm

Correct Answer: C

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Question 18 View Details
A plant grows in a soil with a pH of 6.5. If the plant requires a pH of 5.5 to grow optimally, what is the minimum amount of lime (CaCO3) required to adjust the pH?
A. 1 g
Correct B. 2 g
C. 3 g
D. 4 g

Correct Answer: B

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Question 19 View Details
A 50-year-old man has a family history of hypertension. His blood pressure is 140/90 mmHg. What is the most likely cause of his hypertension?
Correct A. Genetic predisposition
B. Environmental factors
C. Lifestyle choices
D. Medical conditions

Correct Answer: A

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Question 20 View Details
A 30-year-old woman has a history of recurrent infections. Her white blood cell count is 10,000/μL. What is the most likely cause of her recurrent infections?
Correct A. Immunodeficiency
B. Autoimmune disorders
C. Infectious diseases
D. Cancer

Correct Answer: A

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Question 21 View Details
In a typical xylem vessel, what is the primary function of the lignin component?
Correct A. To provide structural support to the vessel
B. To facilitate the transport of water and minerals
C. To regulate the rate of transpiration
D. To prevent the collapse of the vessel

Correct Answer: A

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Question 22 View Details
A plant grows from a seedling to a mature plant in a period of 5 years. What type of growth is this an example of?
A. Primary growth
Correct B. Secondary growth
C. Tertiary growth
D. Quaternary growth

Correct Answer: B

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Question 23 View Details
A nerve impulse travels from the d\endrite to the axon of a neuron. What type of conduction is this an example of?
Correct A. Saltatory conduction
B. Continuous conduction
C. Gradated conduction
D. Non-graded conduction

Correct Answer: A

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Question 24 View Details
A person has a visual acuity of 6/6. What does this mean?
Correct A. The person can see objects clearly at a dis\tance of 6 meters
B. The person can see objects clearly at a dis\tance of 6 feet
C. The person has a visual acuity of 20/20
D. The person has a visual acuity of 10/10

Correct Answer: A

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Question 25 View Details
A couple is trying to conceive a child. What is the most likely cause of infertility in the male partner?
Correct A. Low sperm count
B. Poor sperm motility
C. Abnormal sperm morpho\logy
D. Varicocele

Correct Answer: A

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