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Question

Difficulty: EasyHigher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

Annelids, such as earthworms, possess specialized tubular organs responsible for filtering body fluids and removing metabolic nitrogenous wastes. Which of the following excretory structures is characteristic of annelids?

  1. NephridiaAnswer
  2. B
    Malpighian tubules
  3. C
    Flame cells
  4. D
    Contractile vacuoles

Answer

Nephridia are the specialized excretory structures characteristic of annelids.
Nephridia are the defining segmental excretory organs in annelids. They filter coelomic fluid and maintain water and nitrogenous waste balance.

Step-by-Step Solution

1
Identify the target phylum and physiological system from the question
The question asks for the primary excretory organ of phylum Annelida (e.g., earthworms).
Different animal phyla possess distinct anatomical structures adapted for excretion and osmoregulation.
2
Match the organ system to the correct phylum
Annelids possess segmentally arranged tubular excretory structures called nephridia (metanephridia).
Nephridia open into the coelomic cavity to collect fluid, reabsorb useful substances, and discharge nitrogenous waste through nephridiopores.

Key Concept

Excretory structures across higher invertebrate phyla
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Topics

Higher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

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