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LIGHTAll of us know that the sun is the ultimate source of energy for all activities in our biosphere. The electromagnetic radiations from the sun supply energy which warms up the earth and the atmosphere to provide a favourable global temperature for the living organisms. In addition. light plays a variety of roles in the living world. It is essential for photosynthesis, the process by which light is converted into usable chemical energy. It is involved in the transmission of information, for instance, it helps plants and animals to programme their life cycles. coordinates the opening of buds and flowers, dropping of leaves and a variety of other physiological processes. Variation in theamount of light generally affects the local distribution of plants. In animals light regulates reproduction, hibernation and migration and of course makes vision possible. All these biological phenomena are readily influenced by variation in the intensity, and by seasonal or diurnal variations of light.
Absence of Passive Fit of the Prosthesis A passive fit of the prosthesis reduces long term stresses in the superstructure, implant components and the bone adjacent to the impla
Q. What is Juvenile Mitral Stenosis ? Peculiar to developing countries is the problem of juvenile mitral stenosis. Patients with rheumatic fever develop tight mitral stenosis i
Organization in non-reduced embryo sacs The fate of a nucleus in the embryo sac depends upon its position. Many irregularities in the disposition of nuclei in the early polar
Define Disadvantages of Direct Microscopic Count? 1. Small cells are difficult to see under the microscope and may be missed. 2. It gives total count, i.e., both live and de
Q. What is viscosity? Viscosity is resistance to flow of a liquid. It is a measure of the resistance of a fluid to deformation under shear stress. It is commonly perceived as "
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How do birds reproduce? Birds, like each vertebrate, have sexual reproduction. Their embryos develop within shelled eggs having extraembryonic membranes and outside the mother'
In the absence of any large scale envirorrmental change that is, in more or less uniform environments, populations often maintain a stable genetic constitution with respect to many
Human Impact on Nitrogen Cycle Human activities are profoundly affecting the cycling of nitrogen in nature. Over 30 x 10 6 metric tons/yr. of N 2 is fixed in the commercial
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