Question

Pharyngeal nephridia of Pheretima are found in segments

• A. 6,7 and 8
• B. 5, 6 and 7
• C. 3, 4 and 5
• D. 4, 5 and 6

Answer 1

The correct option is D 4, 5 and 6

The pharyngeal nephridia are found in paired tufts in 4th, 5th and 6th segments around the oesophagus. Each nephridial tuft is composed of numerous nephridia, which open into a common excretory duct. So, there are three pairs of the pharyngeal excretory duct. So, the correct answer is option D.