Question

briefly describe by annileda character.

Answer 1

Hey dude,
Let me answer this question.

1. Annelida are mostly aquatic; marine or freshwater, some terrestrial, bun-owing or living in tubes, sedentary or free-living. Some are commensal and parasitic also.

2. Body triploblastic, bilaterally symmetrical, elongated and vermiform.

3. Body metamerically segmented; externally by transverse grooves and internally by septa into a number of divisions; each division is called a segment, metamere or somite.

4. Organ-system grade of body organisation.

5. Outer covering of the body is cuticle secreted by the underlying epidermis.

6. Body wall is contractile, consisting of an outer epidermis, circular and longitudinal muscles.


Hope it helps.
Thankyou!

Answer 2

$\large{ANNELIDA}$

* $\textbf{Characteristics}$ :-

→ 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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