PRACTICAL NOTEBOOK OF PRINCIPLES OF ECOLOGY | CBCS B.S.c 1st Semester Zoology (hons.)

By Nitul Kalita





















































































Comments

Post a Comment

Popular posts from this blog

Study of Euglena | General characters and classification

By Nitul Kalita
Image
Study of Euglena with General character and classification- General characters-  1. Habitat  : it is found in a stagnant fresh water such as pools and ponds which contain decaying organic matter. 2.  Locomotion  : Euglena moves by the whiplike action of a single flagellum. As Waves pass al ong the flagellum from the base to the tip. The organisms rotate as it moves. It can also move by the contraction of fibrils in its body called Myonemes. These contraction brings about a sequence of changes in the shape and cause euglenoid movement. 3. Euglena viridis is a green and photo-autotrophic organism.The Euglena absorb carbon dioxide from the water in which he lives and energy from the sunlight to carry photosynthesis. It make up its nitrogen requirements by absorbing nitrogenous substances such as amino acids from the water. 4. Structure : Euglena is a microscopic organisms of about...
Read more

Life Cycle and pathogenicity of Wuchereria bancrofti

By Nitul Kalita
Image
Life Cycle and pathogenicity of Wuchereria bancrofti Classification- Phylum- Nematoda Class- Phasmida Order- Filaroida Genus- Wuchereria Species- bancrofti Wuchereria bancrofti  is commonly known as filarial worm. This worm causes filariasis in humans. The name of this worm is given Wuchereria bancrofti in honor of the two scientists Wucherer and Bancroft who made considerable contribution in studying the disease caused by these worms. LIFE CYCLE OF WUCHERERIA Wuchereria is a heterogeneous parasite which completes its life cycle in two different hosts namely man and female culex mosquito. Life cycle in Man- This cycle is also known as Human Phase. The process of copulation takes place in the lymphatic system of the human. The male and female worms copulate when they are present in the same lymph gland. The female worms are ovoviviparous that is they produce eggs which hatch within the body of the female without obtaining ...
Read more

Life cycle and pathogenicity of Entamoeba histolytica

By Nitul Kalita
Image
Entamoeba histolytica Classification-  Phylum — Protozoa Subphylum – Plasmodroma Class – Rhizopoda Sub order – Nuda (Amoebina) Genus – Entamoeba Species — histolytica Entamoeba  histolytica  is  a  protozoan  endoparasite  that  inhabits  the  mucosa  and  submucosa  layers  of  the human large intestine causing, dysentery  and  hepatic  abscess. E. histolytica is cosmopolitan in distribution, but is more common in tropical and sub-tropical countries. In India it occasionally takes an epidemic form. It is estimated that about seven to eleven per cent of the population in India suffers from its infection Life cycle of Entamoeba histolytica E. Histolytica is a monogenetic parasite, as it completes its life cycle in a single host, i.e., man. In its life-cycle there are three distinct morphological forms. –Trophozoite, phase Pre-cystic and phase Cys...
Read more