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Question

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

An aquatic arthropod is found to possess green glands at the base of its antennae for nitrogenous waste excretion and specialized gills for gaseous exchange. To which class of Arthropoda does this organism belong?

  1. CrustaceaAnswer
  2. B
    Insecta
  3. C
    Arachnida
  4. D
    Chilopoda

Answer

The correct class is Crustacea.
Crustaceans are predominantly aquatic arthropods characterized by two pairs of antennae, respiratory gills, and paired green glands (antennal glands) that excrete nitrogenous waste at the base of the antennae.

Step-by-Step Solution

1
Identify the diagnostic excretory and respiratory structures specified in the question stem.
Excretory organ: green glands (antennal glands); Respiratory organ: gills.
Specialized excretory structures and respiratory organs vary across different classes of the phylum Arthropoda based on habitat and anatomy.
2
Match these anatomical features with the corresponding arthropod class.
Crustacea is the only arthropod class characterized by antennal green glands and aquatic gills.
Classes such as Insecta, Arachnida, and Chilopoda have adapted to terrestrial environments using Malpighian tubules, coxal glands, tracheae, or book lungs.

Key Concept

Diagnostic excretory and respiratory organs across Arthropod classes
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Topics

Higher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

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