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Question

What is true about nereis, scorpion, cockroach and silver fish?
  1. They all possess dorsal heart.
  2. None of them is aquatic.
  3. They all belong to the same phylum.
  4. They all have joined paired appendages.

A
They all have joined paired appendages.
B
None of them is aquatic.
C
They all belong to the same phylum.
D
They all possess dorsal heart.
Solution
Verified by Toppr

Nereis is an aquatic annelid so the option B is incorrect.
Scorpions, silverfish and cockroach belong to same phylum arthropoda but Nereis is an annelids. So the option C is wrong.
All insects of phylum arthropoda have jointed appendages but Nereis don't have so the option D is wrong.
All these invertebrates possess a dorsal heart in their body, it is a long elongated tube situated in the mid dorsal line of the thorax.
So the correct answer is A.

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