Question

give an account on phylum annelida

Answer 1

$<b> Hey friend$ ^_^

Here is your answer:

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✨ Phylum Annelida ✨

⏩ Its an invertebrate phyla of the Animal Kingdom.

⏩ They have cylindrical, soft, segmented body.

⏩ They have a true body cavity called the coelom.

⏩ They have special organs of excretion known as nephredia.

⏩ They are aquatic but some live in soil.

⏩ Some are external parasites.

⏩ Earthworms, leeches, ragworms, tubeworms and Nereis are Annelids.

⏩ An annelid worm has a well developed digestive system with the alimentary canal open at both the ends, with a mouth and an anus.

⏩ It is bilateral symmetrical.

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Hope it helps u! ✌✌✌✌✌✌✌✌

Answer 2

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⏩ Phylum - Annelida ⏪
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❤️. Free-living found in moist soil, freshwater, sea or few are parasites

❤️. Body is soft elongated, cylindrical or flattened read divided into segments or metamered by ring like, groves called Annuli

❤️. Symmetry is bilateral, germ layer - triploblastic,

❤️. Level of organisation is organ system

❤️. Having tube within tube body plan

❤️. As there is no skeleton,

❤️. fluid filled coelom serves as a hydrostatic skeleton.

❤️. Digestive tract is complete, straight and extends through entire body

❤️. Respiration is through moist skin that is cutaneous respiration.

❤️. Excretory organ is nephridia, coiled tubules also help in osmoregulation.

❤️. Excretory matter ( a ) Ammonia and (b) Urea in land form in earthworm.

❤️. Chief excretory product is ammonia.

❤️. Nervous system consists of a circumenteric Nerve ring, double and ventral, nerve cord with ganglia.

❤️. Sexes may be separate example Nereis.

❤️. Sexes may be united means bisexual examples earthworm and leech.

❤️. Earthworm is bisexual even there in earthworm cross fertilization occur due to anadromous condition.

❤. These are also know as segmented worms.

❤️. Closed type blood circulation.

❤️. Blood flow body cavity so the body cavity is also known as Hoemocoel.

Examples :

▶️ Nereis ,

▶️Earthworm ( Pheretima posthuma amd aslo know as north Indian earthworm )

▶️ Leech ( Hirudinaria ) ,


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Jai bajarang bali