Phylum Hemichordata
Phylum Hemichordata
All the organisms we have studied so far are invertebrates. They lack a notochord. The notochord is a flexible, rodlike structure running through the length of the body, above the alimentary canal. In all chordates (the phylum we will, study after this), the notochord lies below the hollow nerve cord.
Hemichordates are wormlike unsegmented creatures positioned between Echinodermata and chordates. These form a link between invertebrates and Chordates.
They have some characteristics of both the groups.
The gill slits through which they respire are very similar to those of chordates.
A notochord is absent. But the nerve cord, which is restricted to the collar region, is similar to that of chordates.
The body of hemichordates is divided into three regions—proboscis, collar and trunk
Acorn' worms are included in phylum _____________ | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are correct : (a) Hemichordates are wormlike unsegmented creatures positioned between Echinodermata and chordates. (b) Hemichordates are birdlike unsegmented creatures positioned between Echinodermata and chordates. | |||
| Right Option : A | |||
| View Explanation | |||
The nerve cord is restricted to the collar region of which of the following phylum ? | |||
| Right Option : C | |||
| View Explanation | |||
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