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Difficulty: MediumExcretion and Excretory Organs

During an anatomical examination of an invertebrate, metabolic wastes and coelomic fluids are collected through an open ciliated funnel leading into a coiled, highly vascularized tubule. Which organism and excretory organ pair is correctly described by this mechanism?

  1. Earthworm and nephridiaAnswer
  2. B
    Planaria and nephridia
  3. C
    Earthworm and flame cells
  4. D
    Cockroach and nephridia

Answer

Earthworm and nephridia
The combination of 'Earthworm and nephridia' is correct because annelids possess metanephridia (nephridia), each featuring a ciliated funnel (nephrostome) opening directly into the coelomic cavity to collect metabolic wastes.

Step-by-Step Solution

1
Identify the key structural feature described in the stem.
The presence of an open ciliated funnel (nephrostome) collecting coelomic fluid into a coiled, reabsorptive tubule.
This structural arrangement defines metanephridia (nephridia).
2
Correlate metanephridia with the correct animal phylum and representative organism.
Nephridia are the characteristic excretory organs of annelids such as the earthworm.
Coelomic fluid drainage via a ciliated funnel occurs in coelomate invertebrates like earthworms.

Key Concept

Invertebrate Excretory Organs and Functional Anatomy
Estimated Time:50s
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Topics

Excretion and Excretory Organs

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