Ch.6 - Reproduction of Pteridophytes

seeds of pteridophytes

no seeds

life cycle + generations of pteridophytes

haplodiplontic with the dominance of the sporophyte - while the gametophytes are greatly reduced in size and duration

asexual reproduction of pteridophytes

fragmentation of rhizomes (underground stems)

genus of ferns

polypodium vulgare

conspicuous plant body of ferns

sporophyte

classify ferns acc to types of spores

most -not all- homosporous

spores are produced by

meiosis of sporocytes in sporangia

gametophyte of ferns consists of

heart-shaped prothallus

gametangia of ferns : where?

antheridia and archegonia are grown on the underside of the gametophyte

fertilization in ferns (describe + type)

oogamy - flagellated sperms swim in a thin film of water to reach the neck of the archegonium - fertilizes the egg that remains attached to the prothallus

what happens to the prothallus later ?

withers and dies as the embryo develops into a mature sporophyte ( soon after reproduction)

the prothallus is the

gametophyte

why is the sporophyte of ferns considered dominant ? so ferns are classified as ?

larger and lasts longer - ferns are perennial (bc sporophyte lasts long)

genus of lycopodiopsida

selaginella

classify lycopodiopsida acc to type of spores

heterosporous

special characteristic of lycoposiopsida sporangia

grown in conelike strobilus

describe the stobilus of lycopodioposida

megasporangia on the lower megasporophylls - microsporangia on the upper microsporophylls

what about gametophyte formation in lycopodiopsida?

micro and mega sporocytes undergo meiosis - 4 spores (micro and mega) - gametophytes develop inside the sporangia (micro and mega too)

special development of gametophytes in lycopodiopsida

endoprothally - development of gametophytes within their respective spore walls

fertilization in lycopodiopsida cant happen unless

water carries the flagellated spores