Basis Of Classification
Chapter Name : Animal Kingdom |
Sub Topic Code : 103_11_04_01_04 |
Topic Name : Basis Of Classification |
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Sub Topic Name : Coelom |
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Introduction
Cavity present between the body wall and the gut wall is called the body cavity; presence or absence of it becomes an important criteria for classification of animals.
Pre-Requisites:
What are the various embryonic germ layers?
Activity:
Observe various diagrams displaying body cavity Identify coelom, pseudocoelom or its absence.
Real Life Question:
There is an empty space in our bodies? Why so?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Coelom Coelomates Pseudocoelom Pseudocoelomates Acoelomates | Body cavity which is lined by mesoderm. Animals in which coelom is present. Body cavity not lined by mesoderm, instead mesoderm is present as scattered pouches between endoderm and ectoderm. Animals having pseudocoelom. Animals in which body cavity is absent. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Observe fig.4.3 in NCERT textbook for 11th class. | Differentiating between coelomates, pseudocoelomates and acoelomates. |
Places to visit :
Biology Laboratory
Practical examples around us
| Examples | Explainations |
|---|---|
| Humans are coelomates. |
What you learn in Theory:
Not all organisms are coelomates.
What you learn in Practice:
There is some space present in the body of various organisms.