Classification Of Animals
Chapter Name : Animal Kingdom |
Sub Topic Code : 103_11_04_02_02 |
Topic Name : Classification Of Animals |
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Sub Topic Name : Phylum- Coelenterata (Cnidaria) |
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Introduction
Jelly-fish, corals and hydra belong to this phylum. These are mostly marine.
Pre-Requisites:
Phylum Porifera and its characteristics.
Activity:
Observe jelly-fishes and hydra and compare their shapes and movement. This kills the cells
Real Life Question:
Are corals, plants or animals?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Hypostome Medusa Polyp Alternation of generation/ Metagenesis Nematocytes | The single opening to the gastro-vascular cavity of cnidarians. Umbrella-shaped and free-swimming form of cnidaria. Eg: jelly-fish Cylindrical and sessile form of cnidaria. Eg: hydra. When both forms; polyp and medusa occur in the same cnidaria. Eg: in the case of Obelia, polyps produce medusa asexually and medusae form polyps sexually. Stinging capsules located in the cnidoblasts or cnidocytes of cnidarians. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Peel of Rheo Leaf under microscope and solution of sugar or salt | Understanding that every living cell undergo osmosis. |
Places to visit :
Biology Laboratory, ocean
Practical examples around us
| Examples | Explainations |
|---|---|
| Visit some coral reefs nearest to your area and see the live corals. |
What you learn in Theory:
Cnidarians occur in 2 forms, sometimes both the forms occur in the same individual.
What you learn in Practice:
Corals are not plants though they seem to, but they are actually animals!