Question

The figure shows nephridial system of earthworm is given here. Identify the types of nephridia labelled as A, B and C from the list (i) to (iii) given below and select the correct option.
(i) Septal nephridia
(ii) Integumentary nephridia
(iii) Tufts fo pharyngeal nephridia

• A. A- (ii); B- (i); C- (iii)
• B. A- (iii); B- (ii); C- (i)
• C. A- (ii); B- (iii); C- (i)
• D. A- (i); B- (ii); C- (iii)

Answer 1

The correct option is B A- (iii); B- (ii); C- (i)

Septal nephridia are present on both the sides of intersegmental septa of segment 15 to the last that open into intestine. Integumentary nephridia are attached to the lining of the body wall of segment 3 to the last that open on the body surface and pharyngeal nephidia are present as three paired tufts in the 4th, 5th and 6th segments.