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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.
Chiasmata formation takes place where crossing over occurs. Here Chromatid segments are exchanged which contributes to genetic variability. The 46 homologous chromosomes arrange at
What are the advantages of ecological pyramids?
Q. Descriptions of the genera? A manual is a book that contains information on the area of coverage and keys and descriptions of the families, genera and species including the
The Polymerase Chain Reaction Kary Mullis established the technique of the polymerase chain reaction (PCR) in the year of 1983. He won a Nobel Prize for the procedure in the ye
Q. Do protozoans have a cellular nucleus? All protozoans, as eukaryotes have nucleus, some species like the paramecium have two nuclei the micronucleus and the macronucleus.
What is the role of the ozone layer for living beings? Ozone, O3, is a gas of the atmosphere that filters ultraviolet radiation from the sun disallowing most of that radiation
Which one of the following statements about all the four of Spongilla, Leech, Dolphin and Penguin is correct? 1. Penguin is homiothermic while the remaining three are poikilothe
The excretory of lizard
adaptation of the phylum protozoa to its function
Q. What are the hormones secreted by the thyroid gland? What are their functions? The thyroid secretes the triiodothyronine (T3), hormones thyroxine (T4) and calcitonin. T3
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