Question

In which one of the following organisms excretory organs are correctly stated?

• A. Humans- Kidneys, sebaceous glands and tear glands
• B. Earthworm- Pharyngeal, integumentary and septal nephridia
• C. Cockroach- Malpighian tubules and enter caeca
• D. Frog- Kidneys, skin and buccal epithelium

Answer 1

The correct option is B Earthworm- Pharyngeal, integumentary and septal nephridia

The excretory system of earthworm contains a pair of nephridia in every segment, except for the first three and the last ones. The three types of nephridia are: integumentary, septal, and pharyngeal. The integumentary nephridia lie attached to the inner side of the body wall in all segments except the first two. The septal nephridia are attached to both sides of the septa behind the 15th segment. The pharyngeal nephridia are attached to fourth, fifth and sixth segments.