Question

Characteristics of annelida
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Answer 1

Answer:

here is 5 characteristics of annelids

Characteristics of Annelida

1. The Annelids are coelomate and triploblastic.

2. They exhibit organ system level organization.

3. Their body is segmented.

4. They respire through their body surface.

5. Nephridia are the excretory organs.

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Answer 2

Hey there!

Characteristics of Annelida are :

1. Habit and habitat :

• They are free living organisms some might be parasitic too (eg. leaches)
• They maybe aquatic and terrestrial.
• if terrestrial they live in moist soil.

2. Basic features :

• They have organ system of body organisation.
• They are bilateral, triploblastic and coelomate organisms.
• True Metameric segmentation is present.

3. Body wall :

• Their body wall is made of cuticle, epidermis and muscle layer.
• Body wall may contain minute setae that helps in locomotion. Longitudinal and circular muscle also helps in locomotion.
• Aquatic annelids like NEREIS possess lateral appendages called Parapodia.

4. Digestive System:

• They have complete digestive system as mouth and anus both are present.
• They have extracellular digestion.

5. Blood Vascular System :

• They have closed Vascular system.
• Their respiratory pigment is haemoglobin dissolved in plasma.
• In SABELLA, Chlorocruorin ( green coloured) is present.

6. Respiratory System :

• Respiration takes place through general body surface.
• Some may have external gills too.

7. Excretory system :

• Excretion takes place though help of Nephridia.
• Nitrogenous waste is ammonia in aquatic and urea in terrestrial annelids.

8. Sensory organs :

• Photoreceptors, touchreceptors and chemoreceptors are present mostly in the anterior part .
• some have distinct head.

9. Nervous System :

• Consists of a nerve ring and ventral, double, solid and ganglionated nerve chord.

10. Skeleton System :

• The coelomic fluid of the annelids functions as Hydrostatic skeleton.

11. Reproduction :

• They are mostly bisexual.
• eg. earthworms and leeches are bisexual. and Nereis is unisexual.
• Fertilisation is external.
• development maybe direct or indirect through a larva called TROCHOPHORE.

Hope it helps! :)