Question

To which group of phylum do the following animals belong
a) sea horse, starfish, jellyfish,snails
b) give 2 characteristic feature of each phylum

Answer 1

The name of phylum is chordata. Chordata is divided into different classes.

A)sea horse - phylum -chordata.class -Osteichthyes.

They are marine and fresh water fishes.

Air bladder is present which regulates buoyancy.

Starfish - phylum echinodermata.

Presence of water vascular system.

Excretory system is absent.

Jellyfish - phylum coelenterata.

They have central gastro vascular cavity or coelenteron.

They Are holozoic and carnivorous.

Snails - phylum molluscs.

Their body is covered by a calcareous shell.

The anterior head region has sensory tentacles.

Answer 2

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a)
•Sea horse- Phylum:Chordata
Sub-Phylum:Vertebrata
Class:Osteichthyes

•Starfish-Phylum:Echinodermata

•Jelly-fish-Phylum:Coelenterata(Cnidaria)

•snail-phylum:Mollusca

b)
》$\bf{Phylum-Chordata}$

¤ Presence of notochord,a dorsal hollow nerve chord and a paired pharyngeal gill slits.

¤ They possess a post anal tail and a closed circulatory system.

》$\bf{Phylum-Echinodermata}$

¤ They have an endoskeleton of calcareous ossicles.

¤ Presence of water vascular system which helps in locomotion.

》$\bf{Phylum-Coelenterata(Cnidaria)}$

¤ Presence of cnidoblasts or cnidocytes on the tentacles and the body.

¤ They have a central gastro-vascular cavity with a single opening,mouth on hypostome.

》$\bf{Phylum-Mollusca}$

¤ Body is covered with a calcareous shell.

¤ The mouth contains a file-like grasping organ for feeding called radula.

Hope it helps you
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