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JAMB Biology 1987 Question 8

Question 8

Animal Kingdom

The crayfish is an arthropod because

  1. A.its body consists of a cephalothorax and an abdomen
  2. B.it has a pair each of antennae and antennules
  3. C.every segment of its body carries a pair of appendages
  4. D.its body is covered with an exoskeleton made of chitin.
Show the answer and explanation

Answer: D (its body is covered with an exoskeleton made of chitin.)

Explanation

A chitinous exoskeleton (with jointed limbs) is a feature of all arthropods. A cephalothorax and antennules are found only in some groups, such as crustaceans.