Question

Which of the following nephridia is not found in earthworm?

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

Answer 1

Answer: (B)

Macro nephridia

Nephridia are the organs which mainly helps in excretion and osmoregulation. The septal nephridia in earthworm are arranged in two rows of 40-50, attached on either side of the septa in each segment, behind the 15th segment. The septal nephridia are responsible for preventing loss of water. The integumentary nephridia are the smallest of the three types and are most numerous, 200-250 in each segment. The pharyngeal nephridia occur as paired tufts surrounding the alimentary canal in the 4th, 5th and 6th segments.

So, the correct answer is option B.