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 [...]
Reproductive System of Pheretima (Earthworm)! Male Reproductive Organs of Earthworm: The male reproductive organs consist of testes, testis sacs, seminal vesicles, vasa deferentia, prostate glands and accessory glands. Testes and Testis Sacs: The testes are two pairs, very minute, whitish and lobed structures situated one pair each in segment 10th and 11th found attached with the posterior surface of 9/10 [...]
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 [...]