wel come to kaluthavalai mahavidyalayam. grade 10 students presents……. science in biology,
TRANSCRIPT
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Wel come to Kaluthavalai mahavidyalayam.
Grade 10 Students presents…….Science in biology,
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EARTH WORM
School :- BT/Kaluthavalai MahavidyalayamProject Type :- Power point slide show
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Phylum : Annelida
Class : Oligochaeta
Genus : Megascolex
Species : mauritii
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NEGATIVELY PHOTOTACTIC
NOCTURNAL
LOCOMOTION
BURROWING
FEEDING
BREEDING
REGENERATION
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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
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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.
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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
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Body apertures
1. Spermathecal Pores
2. Female genital Pores
3. Male genital pores
4. Nephridiopores
5. Dorsal pores
6. Anus
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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
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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
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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
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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
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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 .
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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
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Reproductive systemEarthworm is
hermaphrodite or bisexual .
Male reprodutive organs
• Testis
• Seminal vesicles
• Semimal funnels
• Vasa differentia
• Prostate glands
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WORM CAST
VERMI COMPOSTING
FOOD
MEDICINE
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thanks
M.V Students (10)
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