Question

What is chordata ? And explain the protochordata .

Answer 1

$<marque><u>$

▪CHORDATA:-

A large phylum of animals that includes the vertebrates together with the sea squirts and lancelets. They are distinguished by the possession of a notochord at some stage during their development.

$<marque>$

▪PROTOCHORDATES:-

Protochordates are organisms that possess a notochord only in some period of their life. Notochord is a structure which provides support to the body of an animal. For example, Balanoglossus is a protochordate. they are said to be an evolutionary link between invertebrates and chordates.

Answer 2

Answer:

The main difference between chordates and protochordates is that the chordates are the animals that have distinct characteristics such as a notochord, dorsal nerve chord, pharyngeal slits, and a muscular tail whereas the protochordates are an informal group of invertebrates within chordates. Furthermore, the three subphyla of chordates are Vertebrata, Urochordata, and Cephalochordata while protochordates consist of both Urochordata and Cephalochordata.

Chordates and protochordates represent animals with a higher organization within the kingdom Animalia.

What are Chordates:

Chordates are animals that belong to the phylum Chordata with the highest organization in the animal kingdom. The four main characteristic features of the chordates are

Notochord – .

Dorsal,nerve cord

Pharyngeal slits –

Post- tail

protochordates:

Protochordates represent the invertebrate chordates that belong to the two subphyla of chordates called Urochordata (tunicates) and Cephalochordata (lancelets). Cephalochordates evolved from urochordates, who in turn, developed into vertebrates. Though protochordates have all the main characteristics of a typical chordate, they never develop a bony notochord like vertebrates.

.