POST UTME NILE UNIVERSITY 2025 Biology | Objective

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Question 1 View Details
In the context of evolutionary theory, what is the primary mechanism by which species adapt 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 researcher is studying the population dynamics of a species of rabbit. The population growth rate is modeled by the \logistic equation \( \frac{dP}{dt} = rPleft\( 1 - \frac{P}{K}\right \ \) ). What is the carrying capacity of the population?
A. 10
B. 20
Correct C. 30
D. 40

Correct Answer: C

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Question 3 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 on the retina
B. To detect movement
C. To regulate pupil size
D. To produce tears

Correct Answer: A

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Question 4 View Details
A patient is diagnosed with a bacterial infection. The bacteria are gram-positive and have a cell wall composed of peptidoglycan. What is the primary mechanism by which the bacteria maintain their cell shape?
Correct A. Peptidoglycan cross-linking
B. Cell membrane fluidity
C. Protein synthesis
D. DNA replication

Correct Answer: A

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Question 5 View Details
A diagram of the human circulatory system is shown below. What is the function of the part labeled B?
A. To pump blood to the lungs
Correct B. To carry oxygenated blood to the body
C. To regulate blood pressure
D. To produce red blood cells

Correct Answer: B

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Question 6 View Details
In a tropical rainforest e\cosystem, the primary consumers are primarily herbivores that feed on the abundant vegetation. However, some primary consumers are known to be carnivorous. Which of the following is a characteristic of these carnivorous primary consumers?
Correct A. They have a longer digestive tract than herbivorous primary consumers.
B. They have a shorter digestive tract than herbivorous primary consumers.
C. They have a more complex nervous system than herbivorous primary consumers.
D. They have a larger liver than herbivorous primary consumers.

Correct Answer: A

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Question 7 View Details
The sense organ responsible for detecting changes in sound pressure is the?
Correct A. Cochlea
B. Vestibule
C. Eustachian tube
D. Middle ear bones

Correct Answer: A

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Question 8 View Details
The process by which the body eliminates waste products through the kidneys is called?
A. Osmoregulation
Correct B. Excretion
C. Regulation of body fluids
D. Regulation of blood pressure

Correct Answer: B

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Question 9 View Details
The classification of living things into kingdoms is based on?
Correct A. Cell structure
B. Cell function
C. Cellular metabolism
D. Cellular reproduction

Correct Answer: A

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Question 10 View Details
The xylem tissue in plants is responsible for?
Correct A. Transporting water and minerals from the roots to the leaves
B. Transporting sugars and other organic compounds from the leaves to the rest of the plant
C. Supporting the plant's structure
D. Storing food and water

Correct Answer: A

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Question 11 View Details
The xylem tissue in plants is responsible for transporting water and minerals from the roots to the leaves. Which of the following is a characteristic of xylem tissue?
A. It is composed of dead cells
B. It is composed of living cells
C. It transports sugars and amino acids
Correct D. It transports water and minerals

Correct Answer: D

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Question 12 View Details
The nervous system of an organism is responsible for transmitting signals from sensory receptors to the brain. Which of the following is a type of sensory receptor?
A. Photoreceptor
Correct B. Mechanoreceptor
C. Thermoreceptor
D. Electroreceptor

Correct Answer: B

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Question 13 View Details
The process of photosynthesis in plants involves the conversion of light energy into chemical energy. Which of the following is a byproduct of photosynthesis?
Correct A. Oxygen
B. Carbon dioxide
C. Water
D. Glu\cose

Correct Answer: A

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Question 14 View Details
The hormone insulin is produced by the pancreas and plays a crucial role in regulating blood sugar levels. Which of the following is a function of insulin?
A. It stimulates the breakdown of glycogen
B. It inhibits the breakdown of glycogen
Correct C. It stimulates the uptake of glu\cose by cells
D. It inhibits the uptake of glu\cose by cells

Correct Answer: C

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Question 15 View Details
The sense organ responsible for detecting changes in sound waves is the ear. Which of the following is a structure of the ear?
A. Eardrum
Correct B. Cochlea
C. Ear canal
D. Middle ear bones

Correct Answer: B

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Question 16 View Details
A study on the genetic variation of a population found that the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'A'?
Correct A. 0.8
B. 0.6
C. 0.4
D. 0.2

Correct Answer: A

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Question 17 View Details
A patient has a genetic disorder that causes an inability to digest lactose. Which of the following enzymes is deficient in this patient?
Correct A. Lactase
B. Amylase
C. Tryp\sin
D. Pep\sin

Correct Answer: A

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Question 18 View Details
A researcher is studying the effect of pH on the growth of a microorganism. The researcher finds that the microorganism grows best at a pH of 7. If the researcher wants to maintain the optimal pH for the microorganism, what type of buffer solution should be used?
A. Acidic buffer
B. Basic buffer
Correct C. Neutral buffer
D. pH indicator

Correct Answer: C

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Question 19 View Details
A forest e\cosystem is characterized by a mix of deciduous and evergreen trees. What is the primary function of the evergreen trees in this e\cosystem?
A. Food source for herbivores
B. Shelter for wildlife
C. Soil stabilization
Correct D. Carbon sequestration

Correct Answer: D

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Question 20 View Details
A human body requires a balanced diet to maintain optimal health. What is the primary function of the digestive system in the human body?
Correct A. Absorption of nutrients
B. Digestion of food
C. Elimination of waste
D. Regulation of body temperature

Correct Answer: A

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Question 21 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'?
Correct A. 0.36
B. 0.64
C. 0.72
D. 0.84

Correct Answer: A

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Question 22 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. 1

Correct Answer: A

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Question 23 View Details
A diagram of a human eye is shown below. What is the function of the part labeled 'A'?
Correct A. to focus light on the retina
B. to detect light intensity
C. to regulate pupil size
D. to produce tears

Correct Answer: A

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Question 24 View Details
A diagram of a human cell is shown below. What is the function of the part labeled 'B'?
A. to synthesize proteins
Correct B. to store genetic information
C. to regulate cell growth
D. to transport molecules

Correct Answer: B

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Question 25 View Details
A diagram of a human respiratory system is shown below. What is the function of the part labeled 'C'?
Correct A. to exchange gases with the environment
B. to regulate body temperature
C. to produce red blood cells
D. to filter waste products

Correct Answer: A

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