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1) The drainage and other tunnels are much polluted due to the addition of agricultural, industrial, domestic wastes etc. Now a day the water pollution has increased and the aquatic biodiversity has come in to a great danger. Even in these conditions, the oxidative break down of sewage is carried out by some aerobic bacteria with the release of abundant oxygen for the biological process of unicellular by the bacteria for the oxidative breakdown of sewage. They recover mineral nutrients from the sewage. Both these increase the oxygen bad smell to water, their mucilage also becomes home for the growth of unwanted bacteria. This water is not suitable for drinking and also the diffusion of oxygen in to water from the outside, so aquatic an*mals die due to shortage of oxygen. 2) The spacemen will need a device to get rid of CO2 and other body wastes and will require oxygen and food. This need will be fulfilled 3)  Most algal members bring about photolysis of water and release hydrogen which is used as a source of nonpolluting fuel i.e as a 1) ALGAE AS BIOFERTILIZERS: Most of the members of blue green algae grow on soils and bring about biological Nitrogen fixation with the and decay; they get mixed with the soil which increases the organic and nitrogen contents, soil porosity and water holding capacity of 3) Bioremediation of problem soils. The members of blue green algae grow on alkaline soil and bring down the pH to neutral and thus make the soil suitable for cultivation (soil reclamation). The members play important role in lowering of pH, increase in nitrogen content of soil, mobility of phosphorus and micronutrients. Some algal strains are recommended for different soils are: Like fungal and bacterial biotechnology, algae also provide sophisticated as*et to the algal biotechnology. Some of the aspects 1) SINGLE CELL PROTEIN (SCP): It refers to the protein obtained from the one celled microbes. It can be obtained from the members of containing amino acids (Cysteine and Methionine). So it is more suitable as an*mal food. The cells (microbes) can be cultured in the