Question

You are given leech, Nereis, Scolopendra, prawn, and scorpion; and all have segmented body organization. Will you classify them into one group? If no, give the important characters based on which you will separate these organisms into different groups.

Answer 1

Important characters based on the organisms of different groups:

Leech:

1. It belongs to the phylum Annelida.
2. Leeches are segmented parasitic worms.
3. The locomotory organs are suckers.

Nereis:

1. It also belongs to the phylum Annelida.
2. Nereis have a metamerically segmented body.
3. The locomotory organs are parapodia.

Scolopendra:

1. It belongs to the phylum Arthropoda.
2. Poisonous to nature.

Prawn:

1. It belongs to the phylum Arthropoda.
2. Prawns have five pairs of legs.

Scorpion:

1. It belongs to the phylum Arthropoda.
2. The body is highly segmented.

So, it is clear that leech, Nereis, Scolopendra, prawn, and scorpion are not in the same group.