In this article we will discuss about the General Characters and Classification of Phylum Annelida. General Characteristics of Phylum Annelida: Some of the general characters of Phylum Annelida are listed below: 1. Habitat: Annelids occur in fresh water, sea water or moist soil. Some are free living, some are burrowing and a few are parasitic. 2. Metameric Segmentation: The annelids [...]
The following points highlight the four main parasitic adaptations of helminths. The adaptations are: 1. Morphological Adaptations 2. Physiological Adaptations 3. Life Cycle Adaptations 4. Immunological Adaptations. 1. Morphological Adaptations: The Helminths, though are of lower grade of organisms, show structural modifications or adaptations along two lines: (a) Degeneration or loss of organs or systems; (b) Attainment of new organs. [...]
In the life history of mosquito there are four stages namely—egg, larva, pupa and imago or adult. (a) Egg: After sexual union the female mosquito lays about 200-400 fertilised eggs in shallow stagnant water. The eggs of Anopheles and Aedes float separately in the water, but the eggs of Culex remain together and float as a single unit. The individual [...]