Question:

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

Updated On: Jun 21, 2024
  • humans - kidneys, sebaceous glands and tear glands
  • earthworm - pharyngeal, integumentary and septal nephridia
  • cockroach - Malpighian tubules and enteric caeca
  • frog - kidneys, skin and buccal epithelium
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The Correct Option is B

Solution and Explanation

Nephridia is the excretory organ of the earthworm. Earthworms have three types of nephridial structures called as septal, integumentary and pharyngeal nephridia. These three nephridial structures are present on different positions in the body and also vary in structures. Septal and pharyngeal nephridia are both enteronephric i.e., nitrogen products are expelled in gut. Integumentary nephridia is exonephric i.e., nitrogen waste products are directly discharged outside.
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Concepts Used:

Excretory products and their elimination

The physiological process of the elimination of metabolic waste from the body is called excretion. The excretory products comprise amino acids, carbon dioxide, urea, uric acid, water, and ammonia. Some of the Molluscs and Echinoderms excrete waste products from the body in the form of amino acids. Ammonia is the foremost excretory product in animals, it is derived from the proteins exists in the food we eat.

Excretory Products in Different Organisms:

Excretory Products in Different Organisms

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