Question:

In Arthopoda, head and thorax are often fused to form cephalothorax, but in which one of the following classes, is the body divided into head, thorax and abdomen ?

Updated On: Aug 18, 2024
  • Myriapoda

  • Crustacea

  • Arachnida and Crustacea 

  • Insecta

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The Correct Option is D

Solution and Explanation

Arthropods commonly exhibit a body structure comprising three segments: the head, thorax, and abdomen. However, in certain instances, the head and thorax may fuse together to create a cephalothorax, as observed in crustaceans like prawns, lobsters, and crabs. The class Insecta, which encompasses insects, largely follows the pattern of having a body divided into distinct head, thorax, and abdomen regions. For instance, cockroaches represent a typical example of this structure. Meanwhile, the Myriapoda group within arthropods includes creatures such as millipedes and centipedes. Additionally, the class Arachnida consists of arthropods like spiders.
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Concepts Used:

Animal Kingdom

Animals are eukaryotic, multicellular species that belong to the Kingdom Animalia. Every animal has a distinct characteristic. They get energy either by feeding on plants or on other animals. There are millions of species that have been recognized, few shares similar characteristics while others vary drastically.

Kingdom Animalia comprises all animals. In the midst of the five kingdoms, the largest kingdom is the animal kingdom. Animals are multicellular eukaryotes. Though, like plants, they do not possess chlorophyll or a cell wall. Therefore, members of the animal kingdom indicate a heterotrophic mode of nutrition. Kingdom Animalia is further classified into ten different subphyla based on their body designs or differentiations.

The different phyla of the Kingdom Animalia are as follows:

  1. Porifera
  2. Coelenterata (Cnidaria)
  3. Platyhelminthes
  4. Nematoda
  5. Annelida
  6. Arthropoda
  7. Mollusca
  8. Echinodermata
  9. Hemichordata
  10. Chordata

Read More: Classification of Animal Kingdom