What are endospores? How are these different from spores? Solution Answer: Endospores are tough, dormant, non-reproductive structure produced by some bacteria, example Clostridium. The endospores are resistant to UV radiation and extreme conditions such as high and freezing temperatures. They have special coat properties which makes them resistant to harsh environments. Their spore layers include: exosporium, spore coat, spore cortex and core wall. They can form under starving conditions, i.e, lack of nutrients by a process called sporulation. Spore on the other hand is a an active reproductive structure produced by plants or fungi as compared to endospores which are produced by bacteria and are non reproductive, dormant structures..