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Question

Explain about the animals with jointed legs that you have studied.

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Solution

Arthropoda is the largest phylum of the animal kingdom. They are bilaterally symmetrical, triploblastic and coelomate animals.
  • The body is divisible into head, thorax and abdomen. Each thorasic segment bears paired jointed legs.
  • Exoskeleton is made of chitin and is shed periodically as the animal grows. The casting off and regrowing of exoskeleton is called moulting.
  • Body cavity is filled with haemolymph (blood). The blood does not flow in blood vessels and circulates throughout the body (open circulatory system).
  • Respiration is through body surface, gills or tracheae (air tubes).
  • Excretion occurs by malphigian tubules or green glands. Sexes are separate.

Example: Prawn, Crab, Cockroach, Millipede, Centipedes, Spider, Scorpion


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Phylum Arthropoda
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