POST UTME AAUA 2021 Biology | Objective

Are you preparing for POST UTME AAUA exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2021 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is triggered by the activation of the following protein complex:
Correct A. Anaphase-promoting complex (APC)
B. Centromere protein C \( CENP-C \)
C. Histone deacetylase (HDAC)
D. Protein phosphatase 2A (PP2A)

Correct Answer: A

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Question 2
A plant cell is placed in a solution with a high concentration of sucrose. Which of the following structures will be most affected by this change?
A. Vacuole
Correct B. Cell wall
C. Chloroplast
D. Mitochondria

Correct Answer: B

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Question 3
The process of meiosis is essential for the production of gametes in sexually reproducing organisms. Which of the following stages of meiosis is responsible for the reduction in chromosome number?
Correct A. Meiosis I
B. Meiosis II
C. Prophase I
D. Anaphase II

Correct Answer: A

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Question 4
The rate of diffusion of a subs\tance through a membrane is influenced by the following factors:
A. Concentration gradient
B. Surface area
C. Temperature
Correct D. All of the above

Correct Answer: D

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Question 5
The process of respiration in cells involves the breakdown of glu\cose to produce energy in the form of ATP. Which of the following stages of cellular respiration is responsible for the production of ATP?
A. Glycolysis
B. Citric acid cycle
Correct C. Electron transport chain
D. Fermentation

Correct Answer: C

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Question 6
In the context of osmoregulation, what is the primary function of the hypothalamus in regulating thirst and hunger?
A. To regulate the release of ADH and aldosterone
Correct B. To stimulate the sensation of thirst and hunger
C. To control the excretion of water and electrolytes
D. To regulate the balance of electrolytes in the body

Correct Answer: B

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Question 7
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 8
A diagram of the human respiratory system is shown below. Which part of the system is responsible for exchanging oxygen and carbon dioxide?
A. Trachea
B. Bronchi
Correct C. Alveoli
D. Diaphragm

Correct Answer: C

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Question 9
A diagram of the human excretory system is shown below. Which part of the system is responsible for filtering waste from the blood?
Correct A. Kidneys
B. Ureters
C. Bladder
D. Urethra

Correct Answer: A

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Question 10
A diagram of the human skeletal system is shown below. Which part of the system is responsible for supporting the body?
Correct A. Vertebrae
B. Ribs
C. Pelvis
D. Skull

Correct Answer: A

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Question 11
The process of meiosis in humans results in the production of how many haploid cells from a diploid cell?
A. 4
Correct B. 2
C. 6
D. 8

Correct Answer: B

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Question 12
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
Correct A. Nucleus
B. Mitochondria
C. Chloroplast
D. Vacuole

Correct Answer: A

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Question 13
The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation if five conditions are met. What is the fifth condition?
A. No mutation occurs
B. No gene flow occurs
C. No genetic drift occurs
Correct D. No selection occurs

Correct Answer: D

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Question 14
A diagram of a human eye is shown below. Identify the part labeled 'B'.
A. Cornea
Correct B. Iris
C. Retina
D. Lens

Correct Answer: B

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Question 15
The process of photosynthesis in plants involves the conversion of carbon dioxide and water into glu\cose and oxygen. What is the byproduct of this process?
Correct A. Glu\cose and oxygen
B. Carbon dioxide and water
C. Nitrogen and phosphorus
D. Sulfur and potassium

Correct Answer: A

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Question 16
In the xylem transport system, what is the primary function of the tracheids?
Correct A. Transport of water and minerals from the roots to the leaves
B. Transport of sugars and other organic compounds from the leaves to the rest of the plant
C. Support and structure for the plant
D. Storage of food and water

Correct Answer: A

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Question 17
What is the process by which plants release water vapor into the air?
A. Respiration
B. Photosynthesis
Correct C. Transpiration
D. Evaporation

Correct Answer: C

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Question 18
In the human body, what is the primary function of the circulatory system?
Correct A. Transport of oxygen and nutrients to cells
B. Removal of waste products from cells
C. Regulation of body temperature
D. Maintenance of fluid balance

Correct Answer: A

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Question 19
What is the process by which cells divide to produce two daughter cells?
Correct A. Mitosis
B. Meiosis
C. Binary fission
D. Endosymbiosis

Correct Answer: A

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Question 20
In the human body, what is the primary function of the nervous system?
A. Control of body movements
B. Regulation of body temperature
C. Maintenance of fluid balance
Correct D. Proces\sing and transmission of information

Correct Answer: D

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Question 21
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. 0.48
D. 0.16

Correct Answer: A

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Question 22
A student is studying the structure of a plant cell. Which of the following organelles is responsible for photosynthesis?
A. Mitochondria
Correct B. Chloroplast
C. Vacuole
D. Nucleus

Correct Answer: B

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Question 23
A researcher is studying the effect of light on the growth of radish plants. Which of the following wavelengths of light is most beneficial for plant growth?
A. Blue light \( 450-495 nm \)
Correct B. Red light \( 620-750 nm \)
C. Ultraviolet light \( 100-400 nm \)
D. Infrared light \( 750-1400 nm \)

Correct Answer: B

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Question 24
A student is studying the classification of living organisms. Which of the following kingdoms is characterized by the presence of cell walls made of chitin?
A. Animalia
B. Plantae
Correct C. Fungi
D. Protista

Correct Answer: C

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Question 25
A researcher is studying the effect of temperature on the growth of bacteria. Which of the following temperatures is most beneficial for bacterial growth?
A. 10°C
B. 20°C
Correct C. 30°C
D. 40°C

Correct Answer: C

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