[plants]: pteridophytes Flashcards
pteridophytes include
horsetails and
ferns
uses of pteridophytes
medicinal purposes
soil binders
ornamentals
evolutionary significance
first terrestrial plants
first to possess vascular tissues
first to possess true roots, stems,leaves
first to incorporate endosporic development
habitats
cool shady places
sometimes even on sandy soil
main body is
sporophytic in nature
the leaves in pteridophyta are
microphylls(small; like in selaginella)
macrophylls(large; like in ferns)
the sporophytes bear
sporangia
that are subtended by leaf-like appendages
called sporophylls
in some cases, sporophylls may
distinct
compact
structures called strobili or cones
eg: selaginella, Equisetum
the sporangia produce spores by
meiosis in spore mother cells
the spores germinate to give rise to
inconspicuous small multicellular free-living mostly photosynthetic thalloid gametophytes called prothallus
the prothalli require (habitat)
cool damp shady places to grow
due to the limitation of habitat adaptation
pteridophytes are distributed to only certain narrow geographical regions
sex organs in pteridophytes
antheridium
archegonium
_____ is required for fertilisation
water
zygote produces
sporophytic body
