UPSC Prelims 2014·GS1·science-and-technology·science and technology

Among the following organisms, which one does not belong to the class of other three?

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Last updated 23 May 2026, 3:31 pm IST
  1. ACrabCorrect
  2. BMite
  3. CScorpion
  4. DSpider

Explanation

To determine which organism does not belong to the class of the other three, we need to classify them: Crab: Crabs belong to the class Malacostraca, which is part of the subphylum Crustacea, within the phylum Arthropoda. Crustaceans are primarily aquatic arthropods and typically have ten legs (including claws). Mite: Mites belong to the class Arachnida, within the phylum Arthropoda. Arachnids are characterized by eight legs (four pairs) and a body divided into two main segments (cephalothorax and abdomen). Scorpion: Scorpions also belong to the class Arachnida, within the phylum Arthropoda. Like mites, they have eight legs. Spider: Spiders are also members of the class Arachnida, within the phylum Arthropoda, and are known for their eight legs. Therefore, mites, scorpions, and spiders all belong to the class Arachnida, while a crab belongs to the class Malacostraca (Crustacea). Hence, the crab does not belong to the same class as the other three.
science-and-technology: Among the following organisms, which one does not belong to the class of other three?
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