During a microbial study, a spore was observed which is thick walled, highly resistant and gets surrounded by different layers. These can withstand temperature as high as 100ºC or as low as -100ºC, so they can remain unharmed during pasteurization. From these characters we can predict that the spore must be

During a microbial study, a spore was observed which is thick walled, highly resistant and gets surrounded by different layers. These can withstand temperature as high as 100ºC or as low as -100ºC, so they can remain unharmed during pasteurization. The spore is an endospore which has many layers like the spore coat, exosporium, cortex.