Question

General characters and classification of pteridophytes ppt

Answer 1

-Pteridophytes are the first true land plants
-Life cycle is heterologous diplohaplontic type.
-Sporophyte has true roots, stem and leaves.
-Spores develop in sporangia are homosporous or heterosporous.
-Sporangia are produced in groups on sporophylls.
-They are seedless vascular cryptograms

Answer 2

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Here's your answer !!!

Pteridophytes are non flowering plants (Cryptogams)...

Pteridophytes include Club mosses , horsetails , ferns etc....
➡These are first terrestrial plants to posses vascular tissue....

➡The main plant body of pteridophytes is sporophyte.It is differentiated into true roots,stem and leaves...

➡Pteridophytes are commonly called as Vascular cryptogams....

➡Roots are adventitious and stem is underground rhizome...

➡The leaves of pteridophytes are small(Microphylls)as in selaginella or large folds (macrophylls) as in ferns...

➡ Ferns show circinate vernation and the petioles are covered with brown multicellular hairs called Ramenta....

➡The stele may be prostele or siphonostele or solenostele...

➡One of the important characters of pteridophytes is that the sporophyte and Gametophyte are independent where as sporophyte is dominant,long lived whereas the gametophyte is reduced and short lived....

➡ Gametophyte is small , Short lived and it is produced from Haploid spores known as Prothallus....

➡ Sporophyte of the plant may be homosporous (all spores are similar) or heterosporous (Two different types of spores) i.e. microspores and megaspores...

➡Prothallus (gametophyte) are monoecious or dioecious...

➡Sex organs are Antheridia and Archegonia ,they are sessile....

➡Male gametes are Antherozoids formed from Antheridia...Antherozoids are uninucleate,spirally coiled ,biflagellate or multiflagellate structures....

➡ Union of male and female gametes results in Diploid zygote...Zygote develops into embryo...

➡The Pteridophytes are classified into four classes viz ,. Psilopsida , Lycopsida , Sphenopsida and Pteropsida.....

Psilopsida : Psilotum
Lycopsida : Lycopodium , Selaginella
Sphenopsida : Equisetum
Pteropsida : Bryopteris , Pteris , Adiantum


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