Question

Brief Explanation Of Phyllum Annelida?

Answer 1

✍️Kingdom : Animalia

Habitat : mostly aquatic some are terrestrial.

Characteristics

They have long and segmented body.

They are billateraly symmetrical

They are triploblastic

They are coelomate . A body cavity or coelom are present.

Digestive system complete & Developed

Fertilization can be internal or external

Example

i) Earthworm

ii) Polychaetes

iii) Leeches

Answer 2

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$\textbf{ANNELIDA(Annulus Ring)}$➡ Members Of This Class Also Known As $\textbf{Segmented Worms.}$
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●Thier Body Is Made UP of segments accordingly the name of the Phyllum is $\textbf{Annelida/ Segmented worms}$
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●$\textbf{HABITAT}$➡ They are found in Moist Soil, F.W(fresh water), And M.W(marine water).
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●$\textbf{HaBIT}$➡The Members of Phylum Annelida are free living, some are ectoparasite on vertebrates for example:- bloodsucking leech.
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●$\textbf{SYMMETRY}$➡They are bilateral symmetrical.
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●$\textbf{Germ layers}$➡ They are triploblastic animals having well developed Mesoderm.
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●$\textbf{Coelom}$➡Annelids are first [tex}\textbf{EUCOELOMATES}[/tex] (shizocoelomates animals).
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●$\textbf{level of organisation}$➡They have organ system level of organisation.
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●$\textbf{Body plan}$➡They have Protostomian Type tube within tube Body plan.
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●$\textbf{Alimentary canal}$ is complete digestion of food is extracellular.
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●$\textbf{Respiration}$ occurs through most skin containing capillary Bed of blood capillaries.
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●$\textbf{Circulation}$➡Annelids are the first animal having closed type of blood circulation containing blood vessels, Hearts, enterior loop, and blood capillaries.
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●The blood is red due to the presence of red coloured respiratory pigment haemoglobin is dissolved in the blood plasma(erythrocronin).--RBC are absent while some amoebocyst WBC's Are Present.
•Exception➡in leech circulation is open type.
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●$\textbf{Excretion}$➡excretion occurs through highly Coiled Tubules/Nephradia.
•$\textbf{Earthworms}$ have three types of Nephridia:-
●$\textbf{Septal}$➡Endonephric
●$\textbf{Pharynged}$➡Endonephric
●$\textbf{Integumentary}$➡Exonephric
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☆$\textbf{Nephridia}$ also helps in osculation and respiration.
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➡ $\textbf{Aquatic tenids are Amonotelic}$ while Terrestrial tenids are ureotelic earthworm is Amonotelic in water and ureotelic in land.
➡$\textbf{Chloragogen cells or yellow cells}$ are found in coelom are excretory in function.
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☆$\textbf{Botryoidal tissue}$ in leech is coelomic in origin and partial help in excretion.
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➡Coelom in leech is called $\textbf{Hameocoel.}$
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☆$\textbf{IN earthworms Coelomic fluid}$ comes out through dorsal pores it keeps the skin moist and smooth phagocytic Coelomates destroy or engulf the germs present on skin.
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●$\textbf{Nervous system :}$
➡Nervous system of Annelids(earthworm) include:-
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1)$\textbf{CNS(central nervous system)}$

2)$\textbf{PNS(peripheral nervous system)}$
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●$\textbf{Sensory Organs}$➡
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1)$\textbf{Eyes}$➡Photo Receptors For Vision.

2)$Tentacles$➡Tangoreceptors for touch.

3)$\textbf{Palps}$➡Tangoreceptors for touch.

4)$\textbf{Phaosomes}$➡Photoreceptors for light intensity in earth worms.
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☆$\textbf{Reproduction}$➡Annilids its perform sexual reproduction mostly and Annelids are bi-sexual (monocious) but some Annelids are Unisexual for eg➡Neries.
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●$\textbf{Fertifertilization}$➡In mostly Annelids fertilization is external and cross but in leechs fertilization is internal and cross.

●$\textbf{Development}$ is mostly indirect through Trochophore larva but in earthworm and leech are there is direct development.
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$\textbf{In Annelids 5 classes Are their}$➡
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1)$\textbf{Polychaeta}$

2)$\textbf{Oligochaeta}$

3)$\textbf{Hirudenia}$

4$\textbf{Archianellida}$

5)$\textbf{Echiurida}$
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$\textbf{HOPE MY ANSWER HELPS U}$✌