What is true about Nereis, scorpion, cockroach and silver fish?

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 jointed paired appendages.

Solution

(Ref to Table) $\begin{array}{|l|l|l|l|l|}
\hline & \text{Nereis} & \text{Scorpion} & \text{Cockroach} & \text{Silver fish} \\
\hline \text{Dorsal heart} & \text{Present} & \text{Present} & \text{Present} & \text{Present} \\
\hline \text{Habitat} & \begin{array}{l}
\text{Sand or rocks in intertidal and} \\
\text{shallow marine waters.}
\end{array} & \text{under logs, rocks, boards and clutter.} & \text{damp but warm places} & \text{dark, damp areas} \\
\hline \text{Phylum} & \text{Annelida} & \text{Arthropoda} & \text{Arthropoda} & \text{Arthropoda} \\
\hline \text{Presence of jointed appendages} & \text{Absent} & \text{Present} & \text{Present} & \text{Present} \\
\hline
\end{array}$ Related Theory Scorpions are found on every continent except Antarctica, in habitats ranging from tropical rainforests to grasslands and deserts. As aduits, most scorpions are nocturnal and solitary, usually staying in the same territory throughout their lives. Many live in burrows they dig or claim and defend from other wildlife.

Asked in: NEET 2007

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