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Classification of Animals — BIOLOGY STD 7 — Question

ICSE BoardEnglish MediumSTD 7BIOLOGYClassification of Animals3 Marks
Question
Answer in detail.
Name the different classes of arthropods. Write one characteristic feature of each class.
✓

Answer

Arthropods are invertebrates with jointed legs, a segmented body, and a bilaterally symmetrical body that is divided into head, thorax, and abdomen.
Anthropods are further classified into –
  1. Arachnids – They have fused head and thorax, four pairs of legs, hard exoskeleton, no wings, and antennae. Examples: Scorpions and spiders.
  2. Crustaceans – They have fused head and thorax, appendages on all segments, a variable number of jointed legs, and two pairs of antennae extending from the head. Examples: lobsters and sprimps.
  3. Myriapods – Body divided into a large number of segments and have two pairs of legs per segment (example: millipede) or one pair of legs per segment (Example: centipede). The number of legs may vary from 20 to 200.
  4. Insects – Their body is divided into head, thorax, and abdomen. They have three pairs of legs, two pairs of wings (some have one pair or none), and a pair of antennae. Examples: ants and butterflies.

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