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It is the process of separating colloidal and suspended impurities from water by passing it through a porous bed made of fine sand and other proper sized granular materials. Filtration is carried out in a sand filter. It consists of a top thick layer of fine sand, placed over coarse sand layer followed by gravel. Water comes from the top.
Small micro-organisms present in sand voids decompose organic matter and remove some of the biological impurities.
Q. What is selective waste collection? The Recyclable waste is waste that can be reprocessed and used again. The waste recycling depends on the separation of the recyclable res
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Energy Input in Ecosystem Survival and functioning of ecosystem is dependent on the input of energy. Continuous availability of energy is essential for supporting diverse ecos
about phylum mollsca and its classification
Two homologous human chromosomes have the following structure: --A--B-.-C--D--E--F--G--H--I--J-- --A--D--C-.-B--E--F--G--J--I--H-- where the letters represent genetic markers and t
Define nutrient requirements and principles of meal planning? In this , we started our discussion with the school age and its characteristics. We learnt about the physical grow
Describe the meaning of Electrical Stimulation Brain stimulation has been used to map connections in the brain and to elicit changes in behaviour. Much of the pioneering work o
MISUSE OF BIOLOGY - Biological achievements are used against human race, e.g. 1 . Bioweapons anitbiotic resistant infective micro-organism are used in wars. e.g., A
RESPIR A TIO N IN FISHES - Respiratory organs are gills. In elasmobranchi 5-7 pairs of gills present, spiracles present. In Teleostomai 4 pairs gills present, covered
Curdlan Curdlan, a glucan with (1→3) is produced by bacterium Alkaliqenus faecalis var. myogenes and some related bacteria. It is a tasteless, odorless white powder, which sw
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