Final answer:
Permed, colored, chemically relaxed, and straightened hair typically has high porosity due to the damage caused to the hair's cuticle layer by chemical treatments. These treatments increase the hair's ability to absorb moisture quickly but also cause it to escape easily, necessitating careful moisture management.
Step-by-step explanation:
Permed, colored, chemically relaxed, and straightened hair tends to have high porosity. Hair porosity refers to the hair's ability to absorb and retain moisture and chemicals. High porosity is often a result of damage to the hair's cuticle layer, which can be caused by chemical treatments such as perms, coloring, relaxing, and straightening. When the cuticle layer is damaged, it lifts and becomes more porous, allowing moisture and oils to be absorbed more quickly but also to escape easily.
Therefore, when hair undergoes chemical treatments that alter its structure, this often increases its porosity. Chemical processes, like the application of perms and relaxers, involve breaking down the hair's natural structure and reforming it, which leads to a lifting of the cuticle and higher porosity. With high porosity hair, care must be taken to provide adequate moisture and proper maintenance to prevent further damage.
So, in answer to the student's question, permed, colored, chemically relaxed, and straightened hair will generally have option 1) High porosity due to the nature of chemical treatments impacting the hair's ability to absorb and hold onto moisture and products.