Through which tube the food passes, that extends from mouth to anus? A) Alimentary canal B) Root canal C) Artery canal D) Back canal Related MCQs: Alimentary canal consists of mouth cavity, pharynx, esophagus, stomach, small and large intestines. Why this complex organ is adopted? Second layer of atmosphere Stratosphere extends from 12 Km to …..? Third layer of atmosphere Mesosphere extends from …..? Fourth layer of atmosphere Thermosphere extends from …..?