Earthworm-Morphology
Chapter Name : Structural Organization In Animals |
Sub Topic Code : 103_11_07_03_04 |
Topic Name : Earthworm-Morphology |
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Sub Topic Name : Nervous System |
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Introduction
Nervous system is basically represented by ganglia arranged segmentwise on the ventral paired nerve cord.
Pre-Requisites:
To understand how nervous system of earthworm functions.
Activity:
Videos which show how nervous system of earthworm functions.
Real Life Question:
Do earthworms have a brain?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| nerve cord | present in the anterior region (3rd and 4th segments) bifurcates, laterally encircling the pharynx and joins the cerebral ganglia dorsally to form a nerve ring. |
| Sensory system | Do not have eyes but does possess light and touch sensitive organs (receptor cells). Worms have specialised chemoreceptors (taste receptors) which react to chemical stimuli. |
Learning aids / Gadgets
| Gadgets | How it can be used |
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Places to visit :
Biology labs in your school and dissect and observe the different organs in earthworm.
Practical examples around us
| Examples | Explainations |
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What you learn in Theory:
The different parts in nervous system of earthworm.
What you learn in Practice:
How earthworms see when they do not have eyes as an organ present.