POST UTME EKSU 2020 Biology | Objective

Are you preparing for POST UTME EKSU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In a tropical rainforest e\cosystem, what is the primary role of the emergent layer in relation to the forest's energy balance?
Correct A. To absorb and store excess energy from the sun
B. To reflect and scatter sunlight to maintain a stable temperature
C. To facilitate the exchange of gases between the forest and the atmosphere
D. To provide structural support for the forest canopy

Correct Answer: A

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Question 2
A patient presents with symptoms of a bacterial infection. Which of the following microorganisms is most likely responsible for the infection, given that the patient has a compromised immune system?
A. Staphylococcus aureus
B. Escherichia coli
Correct C. Pseudomonas aeruginosa
D. Klebsiella pneumoniae

Correct Answer: C

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Question 3
A diagram of a neuron is shown below. What is the primary function of the d\endrites in this neuron?
A. To transmit signals to other neurons
Correct B. To receive signals from other neurons
C. To generate action potentials
D. To synthesize neurotransmitters

Correct Answer: B

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Question 4
A diagram of a simple harmonic oscillator is shown below. What is the relationship between the amplitude and the frequency of this oscillator?
A. Amplitude is directly proportional to frequency
Correct B. Amplitude is inversely proportional to frequency
C. Frequency is directly proportional to amplitude
D. Frequency is inversely proportional to amplitude

Correct Answer: B

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Question 5
A diagram of a human eye is shown below. What is the primary function of the lens in this eye?
Correct A. To focus light on the retina
B. To scatter light and reduce glare
C. To absorb excess light and prevent damage
D. To transmit signals to the brain

Correct Answer: A

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Question 6
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. 0.36
Correct B. 0.64
C. 0.72
D. 0.80

Correct Answer: B

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Question 7
A cell in interphase has a DNA content of 2C. If the cell undergoes mitosis, what will be the DNA content of the daughter cells?
A. 2C
Correct B. 4C
C. 6C
D. 8C

Correct Answer: B

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Question 8
A plant has a genetic trait that is controlled by a \single gene with two alleles. The dominant allele 'A' codes for red flowers, while the recessive allele 'a' codes for white flowers. If a plant with red flowers is crossed with a plant with white flowers, what is the probability that the offspring will have red flowers?
A. 0.25
B. 0.50
Correct C. 0.75
D. 0.90

Correct Answer: C

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Question 9
A cell membrane is selectively permeable because it has what type of transport mechanism?
A. active transport
Correct B. passive transport
C. osmosis
D. diffusion

Correct Answer: B

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Question 10
A plant has a genetic trait that is controlled by a \single gene with two alleles. The dominant allele 'A' codes for tall plants, while the recessive allele 'a' codes for short plants. If a plant with tall plants is crossed with a plant with short plants, what is the probability that the offspring will have short plants?
Correct A. 0.25
B. 0.50
C. 0.75
D. 0.90

Correct Answer: A

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Question 11
The process of cellular respiration involves the breakdown of glu\cose to produce ATP, which is then used to power the cell's various activities. Which of the following statements about the electron transport chain is FALSE?
A. The electron transport chain is the site of oxidative phosphorylation.
B. The electron transport chain is located in the mitochondria.
C. The electron transport chain is responsible for generating the proton gradient.
Correct D. The electron transport chain is the site of substrate-level phosphorylation.

Correct Answer: D

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Question 12
The diagram below shows the structure of a plant cell. Which of the following organelles is responsible for photosynthesis?
A. Vacuole
Correct B. Chloroplast
C. Mitochondria
D. Nucleus

Correct Answer: B

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Question 13
The nervous system is responsible for transmitting signals from the brain to the rest of the body. Which of the following types of neurons is responsible for transmitting sensory information?
A. Motor neuron
Correct B. Sensory neuron
C. Interneuron
D. Glia cell

Correct Answer: B

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Question 14
The process of digestion involves the breakdown of food into smaller molecules that can be absorbed and utilized by the body. Which of the following enzymes is responsible for breaking down proteins?
A. Amylase
B. Lipase
Correct C. Protease
D. Lactase

Correct Answer: C

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Question 15
The diagram below shows the structure of a cell. Which of the following organelles is responsible for regulating the cell's genetic material?
A. Mitochondria
Correct B. Nucleus
C. Endoplasmic reticulum
D. Ribosome

Correct Answer: B

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Question 16
In the context of evolutionary theory, what is the primary mechanism by which populations adapt to changing environments?
Correct A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation

Correct Answer: A

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Question 17
A cell is placed in a solution with a high concentration of glu\cose. What is the expected outcome in terms of cellular respiration?
Correct A. Increased glycolysis
B. Decreased glycolysis
C. No change in glycolysis
D. Increased gluconeogenesis

Correct Answer: A

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Question 18
A diagram of the human respiratory system is shown below. What is the primary function of the alveoli?
Correct A. Gas exchange
B. Air filtration
C. Humidity regulation
D. Temperature regulation

Correct Answer: A

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Question 19
A plant cell is placed in a solution with a high concentration of auxin. What is the expected outcome in terms of plant growth?
Correct A. Increased cell elongation
B. Decreased cell elongation
C. No change in cell elongation
D. Increased cell division

Correct Answer: A

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Question 20
A diagram of the human digestive system is shown below. What is the primary function of the pancreas?
A. Digestion of carbohydrates
B. Digestion of proteins
C. Digestion of fats
Correct D. Production of digestive enzymes

Correct Answer: D

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Question 21
In the context of osmoregulation, what is the primary function of the kidneys in a desert-dwelling organism?
Correct A. To conserve water by reabsorbing water from the filtrate
B. To excrete excess salt by producing a highly concentrated urine
C. To regulate electrolyte balance by adjusting the amount of ions in the urine
D. To maintain acid-base balance by adjusting the pH of the urine

Correct Answer: A

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Question 22
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 23
According to the theory of evolution, what is the primary mechanism by which species adapt to their environment?
Correct A. Natural selection
B. Genetic drift
C. Gene flow
D. Mutation

Correct Answer: A

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Question 24
A diagram of a bacterial cell is shown below. Which part of the cell is responsible for DNA replication?
A. Cell membrane
B. Cytoplasm
Correct C. Nucleus
D. Ribosomes

Correct Answer: C

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Question 25
According to the classification of living things, what is the primary characteristic that distinguishes between prokaryotes and eukaryotes?
Correct A. Presence of a true nucleus
B. Presence of mitochondria
C. Presence of a cell wall
D. Presence of chloroplasts

Correct Answer: A

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