Question

Among the invertebrates, arthropods are unique in possessing

• A. A notochord
• B. Ventral nerve cords
• C. Open circulation
• D. Jointed appendages

Answer 1

Answer: (D)

Jointed appendages

• The bodies of Arthropods are divided into a number of segments. However, few of these segments are sometimes fused to form integrated body parts known as tagmata. This process of fusion is called tagmosis. The head, thorax and abdomen are examples of tagmata.
• Arthropods also have appendages with joints (the word "arthropod" means "jointed feet"). In early, primitive anthropods, each body segment was associated with a single pair of appendages (attachments). However, in most species, some appendages have been modified to form other structures, such as mouthparts, antennae, or reproductive organs.
• Arthropod appendages may be either biramous (branched) or uniramous (unbranched).