Lower l/3rd of anal canal is derived from-
Ans. is 'b' i.e., Proctodaeum * 'The lower third of the anal canal is an ectodermal derivative and is derived from the proctodaeum.'* Part of anal canal above pectinate line develops from dorsal part of endodermal cloaca (primitive rectum) and part of anal canal below pectinate line develops from ectodermal proctodeum.
Proctodaeum
Cloaca
Urogenital Sinus
Midgut
Abdomen & Pelvis