POST UTME OSUSTECH 2020 Biology | Objective

Are you preparing for POST UTME OSUSTECH 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 mechanism by which nutrients are cycled from the dead plants and animals back to the living organisms?
Correct A. Decomposition by fungi and bacteria
B. Nutrient uptake by plant roots
C. Nutrient release through leaf fall
D. Nutrient cycling through animal migration

Correct Answer: A

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Question 2
In a desert e\cosystem, what is the primary adaptation of cacti to conserve water?
Correct A. Thick, waxy stems to store water
B. Deep roots to access groundwater
C. Small leaves to reduce transpiration
D. Spines to reduce water loss through evaporation

Correct Answer: A

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Question 3
In a coral reef e\cosystem, what is the primary source of energy for the food web?
Correct A. Phytoplankton
B. Zooplankton
C. Detritus
D. Fish

Correct Answer: A

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Question 4
In a forest e\cosystem, what is the primary mechanism by which trees regulate their water balance?
Correct A. Transpiration through stomata
B. Root uptake of water
C. Evaporation from leaves
D. Condensation on leaves

Correct Answer: A

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Question 5
In a grassland e\cosystem, what is the primary adaptation of grasses to survive drought?
Correct A. Deep roots to access groundwater
B. Small leaves to reduce transpiration
C. Waxy stems to store water
D. Spines to reduce water loss through evaporation

Correct Answer: A

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Question 6
In a eukaryotic cell, the process of osmoregulation involves the movement of water across the plasma membrane through a specific type of transport protein. Which of the following types of transport proteins is primarily responsible for this process?
Correct A. Aquaporin
B. Na+/K+-ATPase
C. Ca2+-ATPase
D. H+/K+-ATPase

Correct Answer: A

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Question 7
A 25-year-old male patient presents with symptoms of hyperglycemia, polyuria, and polydipsia. His blood glu\cose level is 250 mg/dL. Which of the following hormones is primarily responsible for the increased glu\cose production in this patient?
A. Insulin
Correct B. Glucagon
C. Adrenaline
D. Cortisol

Correct Answer: B

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Question 8
A diagram of the human eye is shown below. Identify the part labeled 'A' in the diagram.
Correct A. Cornea
B. Iris
C. Lens
D. Retina

Correct Answer: A

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Question 9
A 35-year-old female patient presents with symptoms of fatigue, weakness, and shortness of breath. Her complete blood count (CBC) shows a hemoglobin level of 7 g/dL. Which of the following types of anemia is most likely responsible for this patient's symptoms?
A. Iron-deficiency anemia
Correct B. Vitamin B12 deficiency anemia
C. Folate deficiency anemia
D. Sickle cell anemia

Correct Answer: B

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Question 10
A diagram of the human kidney is shown below. Identify the part labeled 'B' in the diagram.
A. Renal cortex
Correct B. Renal medulla
C. Renal pelvis
D. Ureter

Correct Answer: B

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Question 11
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. 0.64
B. 0.36
C. 0.16
D. 0.04

Correct Answer: A

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Question 12
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 13
A plant has a photosynthetic rate of 10 μmol CO2 s-1. If the light intensity is increased by a factor of 4, what is the new photosynthetic rate?
A. 20 μmol CO2 s-1
B. 40 μmol CO2 s-1
Correct C. 80 μmol CO2 s-1
D. 160 μmol CO2 s-1

Correct Answer: C

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Question 14
A diagram of the human circulatory system is shown below. Which part of the system is responsible for transporting oxygenated blood from the lungs to the rest of the body?
A. Pulmonary Artery
Correct B. Aorta
C. Pulmonary Vein
D. Coronary Artery

Correct Answer: B

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Question 15
A plant has a rate of photosynthesis of 10 μmol CO2 s-1. If the light intensity is increased by a factor of 4, what is the new rate of photosynthesis?
A. 20 μmol CO2 s-1
B. 40 μmol CO2 s-1
Correct C. 80 μmol CO2 s-1
D. 160 μmol CO2 s-1

Correct Answer: C

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Question 16
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'R'?
Correct A. 0.8
B. 0.6
C. 0.4
D. 0.2

Correct Answer: A

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Question 17
A 2.5-liter solution contains 1.5 liters of ethanol and 0.5 liters of water. What is the mole \fraction of ethanol in the solution?
Correct A. 0.6
B. 0.7
C. 0.8
D. 0.9

Correct Answer: A

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Question 18
A diagram of the human eye is shown below. Identify the part labeled 'A'.
Correct A. Cornea
B. Iris
C. Retina
D. Lens

Correct Answer: A

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Question 19
A 10-gram sample of a compound containing only carbon and hydrogen is analyzed by combustion. The amount of carbon dioxide produced is 4.5 grams, and the amount of water produced is 3.2 grams. What is the empirical formula of the compound?
Correct A. C2H4
B. C3H6
C. C4H8
D. C5H10

Correct Answer: A

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Question 20
A diagram of a simple harmonic motion is shown below. Identify the part labeled 'B'.
A. Spring
Correct B. Mass
C. Damping
D. Energy

Correct Answer: B

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Question 21
The xylem 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 is responsible for transporting sugars from the leaves to the roots
Correct D. It is responsible for transporting water and minerals from the roots to the leaves

Correct Answer: D

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Question 22
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. Nitrogen

Correct Answer: A

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Question 23
The theory of evolution by natural selection was first proposed by Charles Darwin in his book 'On the Origin of Species'. Which of the following is a key concept of this theory?
Correct A. Survival of the fittest
B. Natural selection
C. Speciation
D. Genetic drift

Correct Answer: A

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Question 24
The human digestive system is responsible for breaking down food into smaller molecules that can be absorbed and utilized by the body. Which of the following is a type of digestive enzyme?
A. Amylase
B. Lactase
C. Tryp\sin
Correct D. All of the above

Correct Answer: D

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Question 25
The classification of living things is based on their shared characteristics and evolutionary relationships. Which of the following is a domain of life?
A. Archaea
B. Bacteria
C. Eukarya
Correct D. All of the above

Correct Answer: D

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