Answer:
Rayon is attacked by insects and fungus because it is made from natural cellulose fibers derived from wood pulp or bamboo. These natural fibers provide a food source for insects and fungi, making rayon susceptible to attacks by these organisms.
On the other hand, nylon and polyester are synthetic fibers made from petroleum-based chemicals. These synthetic fibers do not contain natural cellulose, so they are not a suitable food source for insects and fungi. As a result, nylon and polyester are resistant to attacks by insects and fungi.
