NEET BIOLOGY

Detailed explanation-1: -The phylum Arthropoda contains a wide diversity of animals with hard exoskeletons and jointed appendages. Many familiar species belong to the phylum Arthropoda-insects, spiders, scorpions, centipedes, and millipedes on land; crabs, crayfish, shrimp, lobsters, and barnacles in water (Fig.

Detailed explanation-2: -The term “jointed appendages” refers to appendages that have joints. Jointed appendages are characteristics of the phylum Arthropoda. Legs, wings, and mouthparts are examples of Arthropods’ jointed appendages.

Detailed explanation-3: -The body is usually segmented, and the segments bear paired jointed appendages, from which the name arthropod (“jointed feet”) is derived. About one million arthropod species have been described, of which most are insects.

Detailed explanation-4: -Arthropods have segmented bodies. Each body segment usually has a pair of appendages. The appendages can be antennae, wings, legs, or mouthparts! Body segments are connected by movable joints.

Detailed explanation-5: -Jointed appendages allowed arthropods to have much greater flexibility and range of movement. Advantages of having a hard outer layer are protection, water retention, structural support (particularly on land), and counterforce for attachment and contraction of muscles.