Question

Describe the characteristic features of different Prochordates with suitable diagrams

Answer 1

HERE IS THE ANSWER OF YOUR QUESTION :-

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# Prochordates :-


* Bilateral symmetry means the body can be divided into two equal similar halves by a single plane.

* They are triploblastic animals as three layers are present in them namely ectoderm, mesoderm and endoderm.

* They are mostly marine animals.

* True coelom is present in them.

* Notochord is present in them.

* They don't have vertebral column.

* They don't have proper notochord at all stages of their life.

* Ventral heart is present in them.

* Post and tail is also present in them.

* Ex :- Balanoglossus.

* They are divided into two groups namely :-

1. Urochordata :-

They are marine, mostly sessile, filter feeding animals.

Ex :- Tadpole.

2. Cephalochordata :-

They are also marine, filter feeding in vertebrates.

Ex :- Lancelet.

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HOPE IT HELPS YOU.

Answer 2

The features of Prochordates are :

i) The organisms that belongs to prochordates do not have brain in their body system. Since they lack brain they are named as acrania.

ii) This phylum is classified into 3 sub phylums. These are -

1. Hemichordata

They lack backbone and the organisms are mainly found in the marine conditions.

They have stomochord in them which is persistent.

2. Cephalochordata

In this sub phylum, small fishes are included which do not have paired dorsal fin.

3. Urochordata

In this, the notochord is confined to the larva's tail region.