Question

which of the following is one of the main characteristic features of phylum chrodata

1 Presence of shomochord
2 Presence of pharyngeal gill silt
3 Presence of mantle
4 Presence of combplate​

Answer 1

Answer:

Characteristics of Chordata. Animals in the phylum Chordata share four key features that appear at some stage during their development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail (Figure 2). In some groups, some of these are present only during embryonic development.

The stomochord is a flexible, hollow tube found in hemichordates. Stomochords arise in embryonic development as an outpocketing from the roof of the embryonic gut anterior to the pharynx. In adults, they extend dorsally from the pharynx into the proboscis, and it communicates with the oral cavity.

Explanation:

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Answer 2

Presence of shomochord

➡️Phylum Chordata - Animals of this phylum have a characteristic feature of presence of a notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits.

➡️Within this phylum advanced group called as vertebrates which include fish, amphibians, reptiles, birds, and mammals. 

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