Endospores are formed from well nourished bacteria when the vegetative growth is unsuitable for it . The cell of bacteria elongate, along with elongation of DNA towards the two ends of cell .When the strands of DNA coil at two ends it breaks to form two parts . One of the DNA coil to form helical structure . The cytoplasm around it also become dense and the cell membrane grows inwardly to form septum. The septum divide the cytoplasm and surround the DNA forming two unequal parts. Soon the wall is developed around it. This structure undergoes dehydration, contraction and soon many layer of cortex, spore coat and exosporium are developed when it becomes mature endospore is liberated from bacteria.
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