Question

The septal and pharyngeal nephridia open into alimentary canal and are of enteronephric type. It is an adaptation for the

• A. Conservation of water.
• B. Conservation of heat.
• C. Regulation of temperature.
• D. Regulation of amino acids.

Answer 1

The correct option is A Conservation of water.

• Annelids have highly coiled tubules called nephridia which are involved in the removal of waste.
• The waste is discharged into the gut or the exterior through the nephridiopore.
• The nephridia in some of the annelids are of three types i.e., the pharyngeal, integumentary, and septal nephridia.
• The septal and pharyngeal nephridia open into the gut and, thus, are called enteronephric types.
• This helps to conserve maximum water through the process of reabsorption when waste passes through the gut.

Thus, the correct answer is option A.