Question

• The circulatory system has evolved from
open to closed type in Animal kingdom.
Which Phylum can be called first to
represents closed circulation?​

Answer 1

ANSWER :

Annelida is the phylum which is the first phylum to represent the closed circulatory system.

In closed system of circulation, the blood flows through vessels like veins, arteries, etc.

ADDITIONAL INFORMATION -

Leech, Earthworm, Nereis belongs to this phylum.

The members of this phylum excretes through special structures called Nephridia.

Parapodia are the appendages which helps them in locomotion.

They reproduce by sexual method.

Answer 2

Phylum:

• Closed circulation means the organism has group blood vessels that are suitable for the circulation of the blood.
• In case of open circulation, the blood flows in body cavity. Anelida is the first phylum that has a closed type of circulation.
• The nemathelminthes are the last group that has open type of circulation.
• Phylum annelida, phylum Arthropoda, phylum Echinodermata, phylum hemichordate, and phylum Chordata have a complete closed circulation.

To know:

Name the phyla which show metamerism

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