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Grade 10 Students presents…….Science in biology,

EARTH WORM

School :- BT/Kaluthavalai MahavidyalayamProject Type :- Power point slide show

Phylum : Annelida

Class : Oligochaeta

Genus : Megascolex

Species : mauritii

NEGATIVELY PHOTOTACTIC

NOCTURNAL

LOCOMOTION

BURROWING

FEEDING

BREEDING

REGENERATION

Ear thworms are ter rest r ia l an imals inhabi t ing the moist so i l . They are usual ly found in the upper layer o f so i l to a depth of 30-40cm. They are nocturnal and in day t ime they l ive in the burrows.Dur ing ra iny season they come out and crawl on the ground. Dur ing winter they c lose the burrows by leaves and debr is . Th is is to warm the burrows. Thei r presence is marked by the occurrence of worm cast , the faecal deposi t o f ear thworm.

There are about 500 species of ear thworm. Of which 13 are found in Ind ia . Common var ie t ies are Pheretima and Lumbricus

A fully grown earthworm measures about 150mm in length and 3-5mm width The body is cylindrical and elongated. The anterior end is pointed , while the posterior end is rounded.

EARTHWORM

• 14-16 segments: Clitellum Glandular tissue covering

• Metameres 100-120• Dorsal side- dark mid dorsal

line• Ventral side- genital

openings• Ant. End- Mouth,

Prostomium, Peristomium

Body Segments

Prostomium

Peristomium

Body apertures

1. Spermathecal Pores

2. Female genital Pores

3. Male genital pores

4. Nephridiopores

5. Dorsal pores

6. Anus

The body wall is covered externally by a thin non-cellular cuticle. It is followed by two muscle layers and an inner most coelomic epithelium.The epidermis consists of single layer of columnar cells.Secretory gland cells are also found among the columnar cells

Cuticle, Epidermis, Two muscle layers, Coelomic Epithelium

All segments except first and last bear a ring of microscopic S-shaped chitinous setae ,help in locomotion.by gripping on the soil

T.S. of bodywal l showing Setae

Digestive system

I t i s a s t ra ight tube and runs f rom the f i r s t to the las t segments . I t cons is t s of mouth(per is tomium),buccal cavi ty , pharynx, oesophagus ,a muscular g izzard , s tomach, in tes t ine and anus

Circulatory system

I n e a r t hwor m , t he c i r c u l a t i on i s c l o s ed t ype .The c i r c u l a t o r y sy s t em c ons i s t s o f he ar t , b l ood ve s se l s , c ap i l l ar i e s and b l ood g l ands

Excretory system

Nephridia

Se gm e n t a l l y a r r ange d ne ph r i d i a a r e t he e xc r e t o ry o rgans .

The re a r e t h r ee t ype s o f ne ph r i d i a

s e p t a l ,

i n t e gum e n t a r y a nd

pha r ynge a l .

The nervous sys tem cons is t s o f segmental ly arranged gangl ia and a ventral nerve cord . A gangl ion i s a mass o f nerve ce l l s .

Nerve r ing

Ventral Nerve cord

Sense Organs

Reproductive systemEarthworm is

hermaphrodite or bisexual .

Male reprodutive organs

• Testis

• Seminal vesicles

• Semimal funnels

• Vasa differentia

• Prostate glands

Female reproductive system

• Ovaries

• Oviduccal funnels

• Oviducts

• Spermatheca

surendranaduthila@gmail.com

WORM CAST

VERMI COMPOSTING

FOOD

MEDICINE

thanks

M.V Students (10)

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