Organ and Organ Systems in Animals — Bio Zoology STD 11 — Question

A pair of white and branched collaterial glands present behind the ovaries forms a hard egg case called oothcca around the eggs. Ootheca is a dark reddish to blackish brown capsule about 12 mm long which contains nearly 16 fertilized eggs and dropped or glued to a suitable surface, usually in crack or crevice of high relative humidity near a food source. On an average, each female cockroach produces nearly 15 – 40 oothecae in its life span of about one to two years.