MUNDARIJA KIRISH................................................................................................................3I BOB.QIRQBO’G’IMTOIFA BO’LIMINING UMUMIY TASNIFI….61.1.Qirqbo`g`imtoifa o’simliklarning kelib chiqishi va rivojlanishi…….61.2.Qirqbo’g’imtoifa o`simliklar bo’limining tarqalishi va o’ziga xos xususiyatlari......................................................................................... 9II BOB.QIRQBO’G’IMTOIFA BO’LIMINING SISTEMATIKASI……142.1.Gieniyasimonlar (Hyeniopsida) va Ponabargsimonlar (Sphenophylopsida) sinflari…………………………………………. 142.2.Qirqbo’g’imsimonlar sinfiga kiruvchi turkum va turlar tarkibi……..192.3.Qirqbo’g’imtoifa bo`limi vakillarining tibbiyot va xalq tabobatidagi ahamiyati.............................................................................................. 22XULOSA.............................................................................................................23FOYDALANILGAN ADABIYOTLAR RO’YXATI......................................26ILOVALAR........................................................................................................27