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The terms ecosystem was introduction by Sir Arthur tensely in 1935. An ecosystem can be defined s "a structural and function unit of biosphere consisting of living organisms and their physical environment, both interacting and exchanging the materials between them". In other words," an ecosystem is an area that contains organisms For example Plants, animals, bacteria and human beings etc. which are interaction with one another and with their non- living environment". An ecosystem may be big or small, natural or manmade, eg.:
(i) Micro organism such as bacterial limited to few mm2 or cm2 areas (Natural).
(ii) Desert ecosystem may exist in hundreds of Km2 area (Natural).
(iii) Crop field , aquarium (Man made).
How is lymph propelled through the lymphatics? Some of the larger lymphatics are capable to contract, or else the lymph is propelled by body muscles which contract and 'squash'
Pregnancy toxaemia in sheep (twin lamb disease, sleeping ewes disease, pregnancy ketosis). Pregnancy toxaemia is a multifactor disorder of energy metabolism affecting sheep du
Explain Particle Movement ? Particle Movement : Particles are moved down a concentration gradient by the process of diffusion. Osmosis is simply the diffusion of water acr
Define Conjugation in brief. A form of sexual reproduction in ciliates (Ciliophora). During conjugation two ciliate protozoans join and macronuclei disappears. After meiotic d
What are plant tissues that constitute the functional structures of the leaf veins ? The Leaf veins are made of the vascular tissues.They are constituted by the xylem and the p
Birth of Genetics Modern genetics originated with Gregor Mendel's work. It is based on this paper entitled "Experiments in Plant Hybridisation " published in 1866 inqthe Procee
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HISTORY ON CLASSIFICATION IN BIOLOGY
Plastids The term plastid first used by Haeckel (1865). These are present in plants and few protists (Euglena). On the basis of function plastids are of three types
Define Institutional and Cultural Barriers - Infuse Biology? Inside the university, the departmental promotion and tenure committees understand well the value of contribution t
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