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Earthworm PowerPoint Presentation

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Earthworm Presentation Transcript

Slide 1 - EARTH WORM Surendran. K Surendranaduthila@gmail.com
Slide 2 - EARTH WORM
Slide 3 - EARTH WORM Phylum : Annelida Class : Oligochaeta Genus : Megascolex Species : mauritii
Slide 4 - HABIT NEGATIVELY PHOTOTACTIC NOCTURNAL LOCOMOTION BURROWING FEEDING BREEDING REGENERATION
Slide 5 - Earthworms are terrestrial animals inhabiting the moist soil. They are usually found in the upper layer of soil to a depth of 30-40cm. They are nocturnal and in day time they live in the burrows. During rainy season they come out and crawl on the ground. During winter they close the burrows by leaves and debris. This is to warm the burrows. Their presence is marked by the occurrence of worm cast, the faecal deposit of earthworm. There are about 500 species of earthworm. Of which 13 are found in India. Common varieties are Pheretima and Lumbricus
Slide 6 - EXTERNAL MORPHOLOGY 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.
Slide 7 - 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
Slide 8 - Body apertures Spermathecal Pores Female genital Pores Male genital pores Nephridiopores Dorsal pores Anus
Slide 9 - INTERNAL MORPHOLOGY 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
Slide 10 - 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 bodywall showing Setae
Slide 11 - Digestive system It is a straight tube and runs from the first to the last segments. It consists of mouth(peristomium),buccal cavity , pharynx, oesophagus,a muscular gizzard, stomach, intestine and anus
Slide 12 - Circulatory system In earthworm ,the circulation is closed type.The circulatory system consists of heart, blood vessels, capillaries and blood glands
Slide 13 - Excretory system Nephridia Segmentally arranged nephridia are the excretory organs. There are three types of nephridia septal, integumentary and pharyngeal.
Slide 14 - NERVOUS SYSTEM The nervous system consists of segmentally arranged ganglia and a ventral nerve cord. A ganglion is a mass of nerve cells. Nerve ring Ventral Nerve cord Sense Organs
Slide 15 - Reproductive system Earthworm is hermaphrodite or bisexual . Male reprodutive organs Testis Seminal vesicles Semimal funnels Vasa differentia Prostate glands
Slide 16 - Female reproductive system Ovaries Oviduccal funnels Oviducts Spermatheca surendranaduthila@gmail.com
Slide 17 - INTERACTION WITH MANKIND WORM CAST VERMI COMPOSTING FOOD MEDICINE
Slide 18 - THANKS SURENDRAN. K
Slide 19 - This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.
 

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