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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).
What is Gene therapy Gene therapy targets non germ line cells, ie somatic cells, so will not directly affect gene pool. The frequency of the allele for the genetic disease w
Q. Are the limbs modified into wings of bats and the wings of birds instance of evolutionary homology or analogy? What about whale fins compared to fish fins? Bird and Bat wing
Q. Merits and Demerits of system classification? Merits The merits of this system\are as under: • Careful observation and original description of the genera from living
Motion Sickness The pathogenesis of motion sickness is poorly under- stood. The prescription cholinergic blocker scopolamine in a patch or oral formulation can decrease sympto
mitotic division
What is frog central nervous system Consider Neuron B in the frog central nervous system whose plasma membrane has a newly discovered ligand-gated ionotropic receptor, named th
Q. Study of food texture? We learnt earlier that texture is observed in terms of tactile sensations i.e. finger feel and mouth feel. Finger feel is sensed before ingestion, by
Punnet squares
Q. Show characteristics of food products? These sensory characteristics of food products. Food quality, as such, can be divided into three main categories i.e. i. Appeara
Processing of roughage Roughages constitute the bulk of the ration of farm animals and these include green fodder (leguminous and non-leguminous), grasses, and various crop re
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