POST UTME DELSU 2025 Biology | Objective

Are you preparing for POST UTME DELSU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2025 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In a population of 1000 individuals, 70% are heterozygous for the gene controlling the flower color. If 20% of the population is homozygous recessive, what is the frequency of the recessive allele?
A. 0.2
Correct B. 0.3
C. 0.4
D. 0.5

Correct Answer: B

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Question 2
A cell is placed in a medium with a pH of 5.5. If the cell has a buffering capacity of 0.2 M, what is the concentration of H+ ions in the medium?
Correct A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M

Correct Answer: A

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Question 3
A plant has a growth rate of 2 cm/day. If it grows for 5 days, what is the total length of the plant?
A. 10 cm
B. 15 cm
Correct C. 20 cm
D. 25 cm

Correct Answer: C

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Question 4
A population of 1000 individuals has a mean height of 160 cm. If the s\tandard deviation is 10 cm, what is the probability that a randomly selected individual has a height greater than 170 cm?
A. 0.1
B. 0.2
C. 0.3
Correct D. 0.4

Correct Answer: D

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Question 5
A cell has a membrane potential of -70 mV. If the resting potential is -60 mV, what is the magnitude of the action potential?
A. 10 mV
Correct B. 20 mV
C. 30 mV
D. 40 mV

Correct Answer: B

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Question 6
In the context of evolutionary theory, what is the primary mechanism by which species adapt to their environments?
Correct A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation

Correct Answer: A

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Question 7
A plant has a genotype of BBRR. If the plant is crossed with a plant having the genotype bbrr, what is the probability that the offspring will have the trait of being red?
A. 0.25
Correct B. 0.5
C. 0.75
D. 1.0

Correct Answer: B

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Question 8
A diagram of a neuron is shown below. What is the function of the part labeled 'D'?
Correct A. To transmit signals to other neurons
B. To receive signals from other neurons
C. To synthesize neurotransmitters
D. To degrade neurotransmitters

Correct Answer: A

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Question 9
U\sing the Hardy-Weinberg principle, what is the frequency of the recessive allele (r) in a population if the frequency of the dominant allele (R) is 0.6?
A. 0.2
Correct B. 0.4
C. 0.6
D. 0.8

Correct Answer: B

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Question 10
A diagram of a plant cell is shown below. What is the function of the part labeled 'E'?
A. To synthesize proteins
B. To store water and nutrients
C. To undergo photosynthesis
Correct D. To generate energy for the cell

Correct Answer: D

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Question 11
In the xylem, what is the primary function of the tracheids?
Correct A. Transport of water and minerals from roots to leaves
B. Production of sugars through photosynthesis
C. Absorption of water and nutrients by roots
D. Transpiration of water vapor from leaves

Correct Answer: A

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Question 12
What is the primary difference between a simple epithelium and a stratified epithelium?
Correct A. Number of cell layers
B. Type of cells present
C. Function of the epithelium
D. Location in the body

Correct Answer: A

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Question 13
In the process of digestion, what is the primary function of the enzyme amylase?
A. Breakdown of proteins into amino acids
Correct B. Breakdown of carbohydrates into simple sugars
C. Breakdown of fats into fatty acids and glycerol
D. Absorption of nutrients into the bloodstream

Correct Answer: B

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Question 14
What is the primary function of the mitochondria in a cell?
Correct A. Production of ATP through cellular respiration
B. Breakdown of proteins into amino acids
C. Breakdown of carbohydrates into simple sugars
D. Absorption of nutrients into the bloodstream

Correct Answer: A

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Question 15
In the process of photosynthesis, what is the primary function of the pigment chlorophyll?
Correct A. Absorption of light energy
B. Breakdown of water molecules into hydrogen and oxygen
C. Production of ATP through cellular respiration
D. Absorption of nutrients into the bloodstream

Correct Answer: A

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Question 16
In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope. Which of the following structures is responsible for this breakdown?
Correct A. Nuclear lamina
B. Nuclear envelope
C. Mitotic spindle
D. Centrioles

Correct Answer: A

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Question 17
The process of osmoregulation in animals involves the regulation of water and ion balance. Which of the following organs plays a crucial role in this process?
Correct A. Kidneys
B. Liver
C. Pancreas
D. Adrenal glands

Correct Answer: A

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Question 18
In a plant cell, the process of photosynthesis occurs in the chloroplast. Which of the following pigments is responsible for absorbing light energy?
Correct A. Chlorophyll a
B. Chlorophyll b
C. Carotenoids
D. Phycobiliproteins

Correct Answer: A

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Question 19
The process of genetic variation in a population can occur through mutation, gene flow, genetic drift, or natural selection. Which of the following is an example of genetic drift?
A. Mutation
B. Gene flow
Correct C. Genetic drift
D. Natural selection

Correct Answer: C

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Question 20
The human eye has a complex structure that allows it to detect light and transmit visual information to the brain. Which of the following structures is responsible for b\ending light as it enters the eye?
A. Cornea
B. Iris
Correct C. Lens
D. Retina

Correct Answer: C

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Question 21
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
A patient is diagnosed with a fungal infection caused by Aspergillus fumigatus. Which of the following is a characteristic feature of this fungus?
A. It produces a yellow pigment
B. It is a dimorphic fungus
Correct C. It produces conidia on a slimy substrate
D. It is a gram-positive bacterium

Correct Answer: C

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Question 23
In a tropical rainforest e\cosystem, what is the primary role of the decomposer community?
A. To produce organic compounds from inorganic subs\tances
Correct B. To break down complex organic molecules into simpler subs\tances
C. To synthesize new organic compounds from inorganic subs\tances
D. To regulate the population of primary producers

Correct Answer: B

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Question 24
A neuron is stimulated by an action potential that travels along its axon. What is the primary mechanism by which the action potential is propagated?
A. Electrotonic conduction
Correct B. Saltatory conduction
C. Passive diffusion
D. Active transport

Correct Answer: B

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Question 25
A cell is placed in a hypertonic solution. What is the primary effect on 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 undergo mitosis

Correct Answer: A

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