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State in detail about Dark Adaptation
Dark adaptation is a phenomenon by which retina and pupil react to decreased illumination. Test is performed using Goldmann-Weeke's adaptometer. Subjec't is pre- adapted to a standard amount of illumination and then presented with a series of light at 11" below fixation. Intensity of flashes is controlled by neutral density filter. Sensitivity curve is a bipartite curve, initial rapid phase represent cone function and second slower segment represent rod function. The inflection on the curve where the rod begins is known as rod cone break (alpha point) and in the healthy eye it occurs 7-10 minutes of dark adaptation. It is useful to detect Vitamin A deficiency, anoxia, tobacco, opacities, degenerations, myopia and glaucoma by this.
Define tracheal system in details. Respiratory system found in insects and some spiders where air passes directly to the tissues through a series of tubules. Since oxygen tran
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what are the two main pollutants that contribute to acid rain
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Explain the Competitive behaviour of social animal group dominance behaviours removal of individuals to other groups which minimises inbreeding eg lions, apes.
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