Practise MYP Biology questions on 4.4 Gas Exchange and review the explanations to check your understanding.
Use these questions for topic practice and to find ideas you want to revisit in your notes or lessons.
If the flow of water across a fish's gills were to stop, why would gas exchange eventually cease even if the blood continued to flow?
True or False: In fish, the counter-current system involves blood and water moving in the same direction to maximize oxygen uptake.
Which of the following is a structural similarity between the spiracles of an insect and the stomata of a plant leaf?
What is the primary functional reason that tracheoles in insects are located in extremely close proximity to individual muscle cells?
As organisms increase in size, why does the skin typically become insufficient as a sole gas exchange surface?
The concentration of oxygen in the water surrounding the gills would become equal to that in the blood, eliminating the diffusion gradient.
The lack of water pressure would cause the gill filaments to expand and block the capillaries.
The fish would no longer be able to produce the ATP required for the active transport of gases.
Oxygen molecules can only diffuse through moving water and cannot move through still water.
True
False
They are both connected to a network of fluid-filled vessels for transport
They both utilize active transport pumps to move oxygen into the organism
They are both primarily located on the upper surface of the organism to maximize sunlight
They both represent regulated openings that allow for the entry and exit of gases
To minimize the distance oxygen must diffuse to reach the mitochondria
To provide structural support to the muscle tissues
To allow the muscles to pump air through the spiracles
To prevent the tracheoles from collapsing under high pressure
The metabolic rate of large animals is always lower than that of small animals.
Oxygen cannot penetrate through more than one layer of skin cells.
Large animals do not have moist internal environments to dissolve gases.
The surface area to volume ratio decreases, making the relative surface area too small.
