Question

Which one does not occur in Earthworm

• A. Septal nephridia
• B. Macronephridia
• C. Integumentary nephridia
• D. Pharyngeal nephridia

Answer 1

Answer: (B)

Macronephridia

In Pheretima there are three types of nephridia,

1. Septal nephridia: These are found situated on the inter-seg­mental septum between 15th and 16th segments to the posterior side of the body.

2. Integumentary nephridia: n each segment of the body from 7th to the last segment, numerous nephridia are found attached inside the lining of the body wall. These are called integumentary nephridia

3. Pharyngeal nephridia: These nephridia lie in three paired tufts, one on either side of the anterior region of the alimentary canal in the segments 4th, 5th, and 6th. The tufts of pharyngeal nephridia also contain blood glands.

So the correct answer is 'Macronephridia'.