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Seedless Vascular Plants

Seedless Vascular Plants - • protects embryo from drought...

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Seedless Vascular Plants, Gymnosperms vascular plants  - “tracheophytes”  completely adapted to land structures support body/conducting vessels >> able to grow tall includes seedless vascular plants, gymnosperms, angiosperms seedless vascular plants  -  Pterophyta - ferns, mostly in tropics o can grow up to 24 m o sporophyte dominates (unlike nonvascular plants) o sori - reproductive structures, on the back of fronds o rhizome - underground stem o prothallus - haploid, produces gametes Psilophyta - whisk ferns, simplest vascular plants (no roots/leaves) Arthrophyta - Horsetails, under 5 ft tall o in wet/marshy places o used as pot scrubbers by native Americans o stobilus - spore producing body o elater - helps spores w/ dispersal o bisexual gametophyte - archegonia develops before antheridia >> prevents self-fertilization Lycophyta - club mosses o has microphyll (single vein w/o gaps between petiole/stem) seed  - makes it possible for terrestrial life 
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Unformatted text preview: • protects embryo from drought, predator • increases dispersal • no need for water to reproduce • pollination through wind, insects, mammals, birds gymnosperms - naked seeds, rests in cones • includes oldest/largest trees o Bristle Cone Pines > 4000 years old o Giant Redwoods > 100 m • Coniferophyta- pines, cedars, cypress, redwood o needle-like leaves o male cones smaller than female cones o male cones located below female cones >> can’t self-fertilize o takes 2 years for cones to fully form • Cycadophyta- tropical/subtropical o centrally-located cone o similar to pine life cycle • Gnetophyta- closest to angiosperms, produces ephedrine • Ginkgophyta- only 1 species (Ginkgo) o flagellated sperm o diecious - 1 sex, male/female trees o females stink because of seed (contains butyric/isobutyric acid)...
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Seedless Vascular Plants - • protects embryo from drought...

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