Economic Importance of Earthworm! Useful Affairs of Earthworms: The earthworms are better known as the friend of farmers due to the following reasons: 1. The earthworms improve the fertility of soil in different ways and, therefore, they are of utmost importance in agriculture. Actually, the burrowing and soil feeding habits of earthworms make the soil porous which permit both aeration [...]
Digestive System of Earth Worm! Alimentary Canal of Earth Worm: The alimentary canal runs as a straight tube throughout the length of the body from the mouth to the anus. It consists of the following regions: 1. Mouth and Buccal Chamber: The mouth is a crescentic aperture lying below the prostomium. The mouth leads into a short, thin-walled tube called [...]
The blood vascular system of Pheretima is of closed type. It consists of the blood vessels, hearts, loops, capillaries and the blood glands. Blood: The blood of Pheretima is red coloured due to the presence of a respiratory pigment haemoglobin in it. The haemoglobin is not contained in the corpuscles like the vertebrates but it is found dissolved in the [...]