Q:

In each of the following questions, certain pairs of words are given, out of which the words in all pairs excepts one, bear a certain common relationship. Choose the pair in which the words are differently related?

• 1
  Hydra : Tentacles
• 2
  Plasmodium : Cilia
• 3
  Cockroach : Antennae
• 4
  Lizard : Flagella