A epiteliy b biriktiruvchi c muskul d nerv

C) lichinkalarining tanasida kiprikiar bo'lishi, lichirtkalari qon aylanish sistemasining yopiqligi
D) ayirish sistemasi har bir tana halqasida birjuftdan joylash-ganligi, nerv sistemasi qorin nerv zanjiri tipida bo’lishi


25. (2013) Halqali chuvalchanglarriing tanasidagi o’simtalari qanday shaklda va ularning vazifasi nimadan iborat?
A) kuraksimon, tayanch
B) ipsirnon, tayanch
C) ponasimon, harakatlanish va tayanch
D) kuraksimon, harakatlanish


26.(2013) Yomg’ir chuvalchangining hazm qilish orgonlari ket- ma-ketligi to’g’ri keltirilgan qatorni belgilang. 1) og’iz; 2) anal teshigi: 3) halqum;
4) jig’ildon; 5) qizilo’ngach; 6) ichak;
7) oshqozon
A) 1,3,5,4,7,6,2 B) 1,5,3,4,7,6,2
C) 1,5,4,3,7,6,2 D) 1,3,4,5,7,6,2


27.(2011) Qaysi chuvalchang ilk bor paydo bo’lgan oyoqlarga cga?
A) qizil chuvalchang
B) yomg'ii chuvalchangi
C) nereida
D) nematoda


28. (2010) Yomg’ir chuvalchangining halqasimon inuskullari qis- qarganda qanday o’zgarish kuzatilishini belgilang.
A) tanasi cho‘ziladi va ingichkalashadi
B) tanasi yo‘g ‘onlashadi, kaltalashadi
C) qon tomirlarida qonning oqishi tezlashadi
D) tanasi kaltalashadi


29. (2010) Halqali chuvalchanglar qaysi chuvalchanglardan kelib chiqqan?
A) to'garak chuvalchanglardan
B) so‘rg‘ichlilardan
C) molluskalardan
D) erkin yashovchi qadimgi yassi chuvalchanglardan


Mollyuskalar tipi


1.Quydagilardan bosh-oyoqli mollyuskalar sinfiga mansub hayvonni toping?
A) perlavitsa B) dreysena
C) sakkizoyoq D) baqachanoq


2.Baqachanoqning mantiya bo’shlig’iga suv qayerdan o’tadi?