Question

What is annelida? Bring out the characteristics of the phylum.

Answer 1

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PhylumAnnelida 

1. Body of these animals is long,cylindrical and metanerically segmented.
2. Most of the animals are free living , but few are ectoparasites. Free living animals maybe marine or freshwater dwellers or terrestrial.
3. These animals are triploblastic, bilaterally symmetrical and eucoelomate.
4. Their body is covered with special cuticle.
5. These animals are either hermaphrodite or unisexual.
6. Examples.. Earthworm, Leech.
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Answer 2

$\huge\textbf{ANNELIDA}$

$\textbf{Characteristics}$

→ These are aquatic and terrestrial animals.

→ They have organ level of organization system.

→ Sense organs like eyes, antenna, nose etc. are present in them.

→ They are Bilaterally symmetry and Triploblastic animals.

a) $\underline{Bilateral \:Symmetry :}$The body can be divided into two equal halves by a single plane.

b) $\underline{Triploblastic :}$ In which three layers namely endoderm, ectoderm and mesoderm are present.

→ Digestive system is complete in them.

→ They respire through their skin.

→ Closed circulatory system is present in them.

→ They reproduce sexually.

→ It divide into segments by rings.

→ Parapodia is present in them, which helps in movement.

→ Ex :- Earthworm, Leeches etc.
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