Formulae on Structural Organisation In Animals


Nephridiopores of integumentary nephridia 200-250 per segment found in all segments of earthworm except the first six. Clitellar segment contains 2000 nephridipores per segment, so called 'forest of nephridia'.

All segments of earthworm except the first, last and clitellar segment contain setae (perichaetine arrangement). Setae are 'S' - shaped, yellowish and chitinus, 80-120 segment. Setae and contraction of muscles help in locomotion.

In male cockroach, eighth and ninth terga are overlapped by seventh tergum. In female seventh, eighth and ninth stema are fused to form a brood pouch. Seventh stermum of brood pouch forms a pair of gynavalvular plates.

More Formulae are available as a part of the SMART Subscription

Preparation Tip for You!
Read the Tips? Now why don't you try solving a few questions in the Practice Lounge

Practice Questions Now

Sign Up to see Formulae for Structural Organisation In Animals