POST UTME AAUA 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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
D. All of the above
Question 2
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?
A. Glu\cose and oxygen
B. Carbon dioxide and water
C. Nitrogen and phosphorus
D. Sulfur and potassium
Question 3
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
C. Fungi
D. Protista
Question 4
A diagram of the human skeletal system is shown below. Which part of the system is responsible for supporting the body?
A. Vertebrae
B. Ribs
C. Pelvis
D. Skull
Question 5
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
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
Question 6
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:
A. Anaphase-promoting complex (APC)
B. Centromere protein C \( CENP-C \)
C. Histone deacetylase (HDAC)
D. Protein phosphatase 2A (PP2A)
Question 7
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 \( 450-495 nm \)
B. Red light \( 620-750 nm \)
C. Ultraviolet light \( 100-400 nm \)
D. Infrared light \( 750-1400 nm \)
Question 8
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
B. Cell wall
C. Chloroplast
D. Mitochondria
Question 9
A diagram of a simple circuit is shown below. What is the current flowing through the resistor labeled 'R1'?
A. 2 A
B. 4 A
C. 6 A
D. 8 A
Question 10
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
D. Proces\sing and transmission of information
Question 11
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 12
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?
A. Meiosis I
B. Meiosis II
C. Prophase I
D. Anaphase II
Question 13
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
C. Electron transport chain
D. Fermentation
Question 14
What is the process by which plants release water vapor into the air?
A. Respiration
B. Photosynthesis
C. Transpiration
D. Evaporation
Question 15
A 1.5 kg block is moving in a circular path with a radius of 0.5 m. If the block has a speed of 2 m/s, what is the centripetal force acting on the block?
A. 2 N
B. 4 N
C. 6 N
D. 8 N

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