The most efficient respiratory structure used by free living protozoan is ________
Answer Details
The most efficient respiratory structure used by free-living protozoa is the body surface.
Protozoa are single-celled organisms that are found in a variety of habitats, including freshwater, marine environments, and soil. They need to take in oxygen in order to survive, just like multicellular organisms.
The body surface of a protozoan is covered in tiny, hair-like projections called cilia, which create a current of water over the surface of the cell. This current helps to bring oxygen-rich water into contact with the protozoan's body, allowing it to diffuse across the cell membrane and into the cell where it can be used for respiration.
This method of respiration is efficient because it takes advantage of the large surface area of the protozoan's body, which allows for a large amount of oxygen to be absorbed. Additionally, the constant movement of the cilia helps to maintain a constant flow of oxygen-rich water over the surface of the cell, ensuring that the protozoan has a continuous supply of oxygen.