Part 06 Phyllum echinodermata, hemichordata and chordata, 11th Biology

Phylum-Echinodermata || Phylum-Hemichordata Phylum-Chordata

Animal kingdom || arthropoda || mollusca || echinodewrmata || hemichordata || chordata

Discussion Class-3 Phylum Mollusca || Echinodermata || Hemichordata || Chordata || Cephalochordata || Pisces || Superclass

17. Kingdom Animalia - Phylum Echinodermata And Hemichordata

Assertion: Hemichordata was earlier considered as subphylum under phylum chordata. But now it is placed as a separate phylum under non-chordata. Reason: Hemichordates have open type of circulatory system and indirect development.

Connecting link between Echinodermata and Chordata is :

Distinguish between (a) Echanidodermata and chordata on the basic of notochord (b) Pisces and aves on the basic of breathing. (c) Platyhelminathese and Echinodermata on the basic of body cavity or coelom.

Which of the following statements are true for the phylum-Chordata? (a) In urochordata notochord extends from head to tail and it is present throughout their life. (b) In vertebrata notochord is present during the embryonic period only. (c) Central nervous system is dorsal and hollow. (d) Chordata is divided into 3 subphyla: Hemichordata,Tunicata and Cephalochordata.

Phyllum- Chordata|Difference Between Chordates And Non Chordates|Classification