Members of one Australian species can grow as long as 3.
In this essay we will discuss about Earthworm. After reading this essay you will learn about: Habitat and Habits of Earthworm 2. Morphology of Earthworm 3. Blood Vascular System 7. Hearts and Anterior Loops 8. Receptors or Sense Organs Copulation and Cocoon Formation and Other Details.
Habitat and Habits of Earthworm: Earthworms are found in wet soil containing rich organic matter. During rainy season, they come out and can be seen easily in lawns, fields and gardens. Life of certain species of earthworm is 4 to 8 years. These nocturnal worms have the following habits.
Earthworms live in burrows secreted by the cutaneous glands. The animals which live in burrows are called fossorial animals. When the burrows are filled with water, the earthworms come out of their burrows in large numbers and start moving on the soil.
The earthworm does not have specialized locomotory organs. The locomotion is brought about by the circular and longitudinal muscles of the body wall, aided by the chitinous curved setae embedded in the skin. Earthworms move at the rate of about 15 cm per minute. The special respiratory organs are lacking in earthworms.
The gaseous exchange takes place by the body wall cutaneous respiration.
The surface of the body wall is kept moist by the secretion of epidermis cells and coelomic fluid, which oozes out of the body through dorsal pores. The body wall is thin and richly supplied with blood. The blood carries an oxygen carrier protein, the hemoglobin dissolved in the plasma.
The atmospheric oxygen diffuses into the blood, where it combines with hemoglobin to form oxyhaemoglobin.
The earthworm breeds in rainy season. Earthworms are protandrous, viz. Hence, cross fertilization occurs. The animal is oviparous.
Several eggs and spermatozoa are packed in the cocoon and on an average four baby worms develop in one cocoon. Earthworms possess a great power of regeneration. Grafting is also possible in the earthworms. A cut part of an earthworm can be grafted to another worm. The colour is glistening dark brown due to the pigment porphyrin.
The dorsal surface is darker than ventral. This type of segmentation which is both external and internal is known as true or metameric segmentation or metamerism. The first segment of the body is termed as peristomium buccal segment which bears a sensory fleshy lobe, the prostomium, anteriorly.
The peristomium contains a crescentic mouth, overhung by the prostomium. These segments are not distinct externally. The clitellum secretes mucus and albumen. Its secretion helps in the formation of cocoon, which is used for fertilization of the eggs.
On the basis of the clitellum, the body of earthworm is divisible into preclitellar, clitellar and post-clitellar regions. Except the first, the last and clitellar segments each segment bears a ring of tiny curved, chitinous structures known as setae or chaetae.
They are embedded in the skin.Read this Science Essay and over 88, other research documents. Worms. Worms Earthworm Dissection Purpose: Earthworms, also known as night crawlers are in the phylum Annelida. To learn more about an /5(1).
This Essay How Does Temperature Effect Earthworms? and other 64,+ term papers, college essay examples and free essays are available now on metin2sell.com Autor: review • December 15, • Essay • 1, Words (8 Pages) • Views Only two main blood vessels make up the earthworms body.
The ventral blood vessel sends 1/5(1). Body Systems of Humans, Crayfish, Pigs, and Earthworms Words Nov 25th, 7 Pages Body Systems of Various Organisms All organisms in the world have a range of systems and organs in their body.
The earthworm body is divided into ringlike segments (as many as in L. terrestris). Some internal organs, including the excretory organs, are duplicated in each segment.
Read this essay on Earthworms. Come browse our large digital warehouse of free sample essays. The front of the body receives blood from the dorsal blood vessels and blood is sent to the back of the body by the ventral blood vessels. | | The bar chart below shows the total mass of herring caught in the Norwegian Sea between Apr 11, · (Results Page 13) View and download body mass index essays examples. Also discover topics, titles, outlines, thesis statements, and conclusions for your body mass index essay. Home; Earthworm Castings Earthworms Are Seen. View Full Essay. Words: Length: 6 . Read this essay on Earthworms. Come browse our large digital warehouse of free sample essays. The front of the body receives blood from the dorsal blood vessels and blood is sent to the back of the body by the ventral blood vessels. | | The bar chart below shows the total mass of herring caught in the Norwegian Sea between
Earthworms are hermaphroditic; The earthworm brain is a bilobed mass lying above the pharynx in the third body segment. Sensory nerves leave the brain and run. Essay # 1.
Introduction to Soil: Soil is the surface layer of earth on which the human civilization depends for its existence. Actually soil represents the loose upper crust of the earth surface distinctly different from the underlying bed rock.
The earthworm brain is a bilobed mass lying above the pharynx in the third body segment. Sensory nerves leave the brain and run forward into the prostomium (extreme anterior end) and first segment. The brain of the active, predatory.