Hemichordata

Question 1: Give two features of Hemichordata.

Answer:

• They are mostly tubiculous living in burrows and are exclusively marine.
• The body is worm-like and is divisible into proboscis, collar, and trunk. 

Question 2: What are the examples of Hemichordata?

Answer:

Balanoglossus, Saccoglossus, and Cephalodiscus are examples of Hemichordata.

Question 3: What is the difference between chordates and non-chordates?

Answer:

The main difference between chordates and non-chordates is that chordates have a spinal cord or backbone in their body structure whereas non-chordates are without notochord.

Question 4: What is the economic importance of Hemichordata?

Answer:

The hemichordates are most important as they provide information about the origin of chordates deuterostomes, and bilateral animals.

Question 5: Name three classes of Hemichordata.

Answer:

Enteropneusta, Pterobranchia, and Planctosphaeroidea are three classes of Hemichordata.

There are distinct animals with distinct structures and forms. Till now, a million species of animals have been introduced, and the urge for classification becomes all the more essential. The classification also assists in allowing a systematic position for newly introduced species. Animals have definite shapes and sizes. They are unbranched except for the sponges. Animal organs are generally internal, e.g., liver, heart, kidney, lungs, brain, stomach, etc. 

The growth of an animal’s body is limited, and it stops long before death. The growth regions are not localized. They can move bodily from one place to another. They have sense organs, nervous systems, and excretory organs. There are different Phyla such as Porifera, Cnidaria, Ctenophora, Platyhelminthes, Nematode, Annelida, Arthropoda, Mollusca, Echinodermata, hemichordate, and Chordata. Let us have an overview of Phylum Hemichordata.