Question

notes on pteridophyta

Answer 1

Pteridophytes Most pteridophytcs are terrestrial and are found in cool, damp and shady habitats.
Some can flourish wellin sandy-soil conditions Thev show much variation in their size, form and habitat Thcy are the first terrestrial organisms to have well developed vascular ussues.

The main plant body in pteridophytes is a sporophyte which is differentiated into roots, stem and leaves The thalloid photosynthetic gametophytes require cool, damp, shady places to grow.

The rimary roots are temporary and last for a short time and are soon replaced by a rentitious roots which gro'v on rhizome Pteridophytes have either small leaves (microphylls) as in Setaginella or large leaves (macrophylls) as in ferns.

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Answer 2

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➧Subkingdom Cryptogamae divided into three groups:-▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃⤵

❶❫ Thallophyta:-        ▬▬▬▬▬▬▬▬▬▬▬☟

①❭ Plants body remains in the form of Undifferentiated.

②❭ Vascular System is Absent.

③❭ Mode of nutrition is Phototrophic & Autotrophic.

④❭ Reproduction is both Sexual & Asexual.

⑤❭ Asexual reproduction takes place by Spore formation.

⑥❭ Fertilization is not followed by Embryo formation.

▶Ex:- Spirogyra, Ulva, Fucus, Volvax & Chara


❷❫ Bryophyta:-     ▬▬▬▬▬▬▬▬▬▬▬☟

①❭ Plant body is not differentiated into true roots, steam & leaves.

②❭ Non-vascular plant are not developed.

③❭ Fixation by rhzoids.

④❭ Gametophyte are the main plant.

⑤❭ Sex organs are multicellular.

⑥❭ Water is required for fertilization.

▶Ex:- Funaria & Riccia

❸❫ Pteridophyta:-     ▬▬▬▬▬▬▬▬▬▬▬☟

①❭ Plant body is differentiated into true roots, steam & leaves.

②❭ Vascular plant are developed.

③❭ Fixation by roots.

④❭ Sporophyte are the main plant.

⑤❭ They are the first truly Terrestrial & vascular cryptogams.

⑥❭ Water is needed for fertilization.

▶Ex:- Azolla & Dryopteris

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