Question

Read the given statement characterizing certain types of animals. Select the option which correctly exemplifies each of these types.

• A. Animals having external gills
• B. Animals having internal gills
• C. animal showing tracheal respiration
• D. Animal revealing buccopharyngeal respiration

Answer 1

The correct option is A Animals having external gills

• Some aquatic salamanders, aquatic larvae of other amphibian species, and a few larval fish species have external gills.
• External gills are of two types, those that grow from internal gill surfaces and those which grow from external gill surfaces.
• External gills are the gills of an animal, that are exposed to the environment, rather than set inside the pharynx and covered by gill slits, as they are in most fishes.
• Hence, Animals having external gills.
• So, the correct answer is 'Animals having external gills'.