JAMB - Biology (1979 - No. 44)
Root hair have their origin from
Endodermis
Pericycle
Cortex
Epidermis
Xylem
คำอธิบาย
Asymmetric cell division in an epidermal cell gives rise to a large cell (atrichoblast) that develops into a hairless epidermal cell and a shorter 'specialized' cell that forms a root hair (trichoblast).