Classification Of Animals
Chapter Name : Animal Kingdom |
Sub Topic Code : 103_11_04_02_10 |
Topic Name : Classification Of Animals |
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Sub Topic Name : Phylum-Hemichordata |
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Introduction
Hemichordata was once placed under Chordata, but some features separate them from chordates so much that hemichordata is now a different phylum.
Pre-Requisites:
The division of Animal Kingdom into various phyla and on what basis is it done. Phylum Echinodermata.
Activity:
Observe hemichordate specimen with the naked eye. Observe the clear distinction of the body into proboscis, collar and trunk.
Real Life Question:
Why is hemichordata a different phylum than chordata?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Proboscis Collar Trunk | Anterior muscular ciliated organ used for locomotion and capture and transport of food. Intermediate organ. Mouth of hemichordates is located between the proboscis and the collar. Posterior and the longest part of hemichordate body. It contains organs for respiration, reproduction and digestion. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Observe the cross section of the trunk of a hemichordate under a microscope. | Spot the various organs and organ systems. |
Places to visit :
Biology Laboratory
Practical examples around us
| Examples | Explainations |
|---|---|
| Balanoglossus is an example of hemichordates. |
What you learn in Theory:
The various features of phylum hemichordata.
What you learn in Practice:
Hemichordates are worm-like animals found in marine waters.