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  ANS: जीवाश्म इंधन तसेच अणुऊर्जेद्वारे प्राप्त होणारी उर्जा पर्यावरणाचा ऱ्हास करण्यास कारणीभूत ठरू शकते. जर असे ऊर्जास्रोत वापरले गेले तर ते पर्यावरणाला हानी पोहोचवू शकतात.

ANS.Stem cells are used for following purposes: (1)IN regenerative therapy stem cells are used. (2)In case of diseased conditions like diabetes, myocardial infartion, alzheimers disease, etc. stem cells can be used to replece damaged or functionless cells. (3)In condition such as anemia, thalassaemia, leukaemia, etc. there is always the need of newer blood cells. here, stem cells can be used to restore the number of blood cells. (4)In techniques of organ transplantation, stem cells can be used and they can help in the transplantation of new organs such as kidney and liver.the defctive organscan be replaced by those that are produced wich the halp of stem cells and transplanted.