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 Science; INVESTIGATION 4

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AuthorMessage
erroruntalan
Lawyer


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Join date : 2010-03-09
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PostSubject: Science; INVESTIGATION 4   Mon Mar 15, 2010 8:45 pm

The Segmented Worms (Annelida or Annulata)

Observations

1. Metamerism (segments)- the metamerism of the body of a typical annelid are distinctly grooved.

Locomotion- they used setae for locomotion which serves as hold fast when the worm is burrowing or moving over the ground.

Reproduction- the earthworm has both the male and female reproductive organs but there is no self fertilization

2. -mouth, pharynx, esophagus, crop, and gizzard
3. -they form its castings by the soil they take, in that contains food
4. -are dorsoxentrally flattened. They like mostly in ponds. Most leeches are "blood suckers" but some are predaceous
5. -leeches are often found in ponds and streams. They usually sucks blood

Applications

1. -because they have the power of regeneration and can even undergo grafting
2. -the value of leeches are some are bloodsuckers but some are predaceous
3. Number of germ layers- annelids have no number of germ layer

Symmetry- the annelids are bilaterally symmetrical

Habitat- annelids lives in land or fresh and salt water

Distinguishing characteristics- annelids have the power of regeneration.


Enjoy... erroruntalan
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