Vascular Plants. Moving to Land. Overtime, 500 millions of years ago, plants on Earth evolved from aquatic to terrestrial environments What are some problems to overcome? Material transport Structure/support Desiccation Gas exchange. Benefits to moving to land.
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Roots, stems and leaves
2) plants with unprotected seeds
(ie. Cone-bearing plants) 3) flowering plants
-gametophyte (n) makes gametes sperm (n) and egg (n)
-gametes fuse when mature, fertilization
-zygote (2n) develops attached to gametophyte (n)
-zygote becomes spore-bearing sporophytes (2n)
-spores (n) disperse and develop into gametophytes(n)
-large leaves are called fronds
-fronds contain spores on the underside, contained in a sac called sporangia
-sporangia cluster together to form a sori
Sori containing clusters of sporangia
Grape-looking structures are individual sporangium