In this article we will discuss about the dissection of earthworm. Also learn about:- 1. The Alimentary System 2. Dissection of Nervous System 3. Dissection of Reproductive System. Earthworms are delicate animals (Fig.2.1) and need careful handling to avoid damage to internal organs. Killing: Wash the live specimens with water to get rid of mucus. Drop them in a petri [...]
Pheretima: Habit and Habitat and External Features ! Habit and Habitat of Earthworms: The earthworms are burrowers. They are found in the soil rich in decaying organic matters usually in gardens, pastures, lawns, irrigated farm lands, near the banks of the ponds, lakes and rivers. The do not prefer to live in sandy, clay and acid soils which are deficient [...]
Excretory System of Nephridia (Earthworm)! These are of three types according to their location in the body: 1. Septal nephridia; 2. Integumentary nephridia 3. Pharyngeal nephridia. 1. Septal Nephridia: These are found situated on the inter-segmental septum between 15th and 16th segments to the posterior side of the body. Each septum bears nephridia on both the surfaces arranged in semicircles [...]