da shuke-shuke kamar yadda ka sani sarai kwayoyin halitta ne na masarautar shuka. A cikin su muna samun bishiyoyi, furanni, ganyaye, shuru, lianas, mosses, algae, da sauransu. Shuke-shuke suna samun kuzarinsu daga hasken rana, ta hanyar daukar hoto tare da chlorophyll da ke cikin chloroplasts, wanda ke basu koren launinsu. Adadin adadi yana da wahalar tantancewa, amma an yi amannar cewa akwai tsakanin 300 zuwa dubu 315 na tsirrai.
Duniya tana da nau'ikan tsire-tsire iri-iri da za mu iya tunanin cewa ba ta da iyaka, amma saboda wannan dalilin aikin raba su rukuni-rukuni don kyakkyawan tsarinsu da nazarinsu yana da ban mamaki.
Daga cikin mafi sauki zamu sami abin da ake kira Bryophytes ko Bryophyta, wanda aka ɗauka azaman tsirrai na farko da suka mamaye duniya sama da shekaru miliyan 200 da suka gabata. A matsayinsu na kebantattu daga cikinsu mun lura da cikakken sauki da walwala da suke dasu, ba tare da wani tsari mai tsari wanda zai nuna su tunda abin da za'a iya kiransu asalinsu kawai zai rike duniya kuma shan ruwa yana kai tsaye tare da tuntuɓar mutane. . Chlorophytes da pteridophytes wani bangare ne daga cikinsu, ana fassararsu azaman ferns da algae a duk nau'ikan su.
Sauran nau'in tsirrai sune Cormophytes, ko kuma Cormophyta, waɗanda suke da tushe, tushe da ganye kamar yadda aka ayyana sassa, kowane ɓangare yana da takamaiman aikinsa. Yana da kyau a faɗi cewa suna da rabe-rabe uku: spermatophytes, shuke-shuke tare da tsaba; pteridophytes, ba tare da furanni da / ko tsaba ba; ko angiosperms, inda aka haɗa iri a cikin thea fruitan.