Plant Diversity.pdf

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Seed <strong>Plant</strong>s first appear in fossil record in rocks dating to about 425 million years old - Seeds: have protective seed coat, protects embryo from drying out, from predators, provides for food storage for embryonic plant, many have adaptations for dispersal All heterosporous, gametophyte dependent upon sporophyte Microgametophytes are called pollen and contain sperm Megagametophytes are multicellular, contain an egg, and are found within an ovule on the sporophyte Pollination precedes fertilization and fertilization may be delayed Divided into two informal groups gymnosperms (naked seeds) - ovule not enclosed in sporophyte tissue when first formed (ovule is naked) angiosperms (covered seeds) - ovule enclosed in sporophyte tissue when first formed (ovule is enclosed)
Gymnosperms comprise 4 phyla Coniferophyta (conifers) - 601 spp. Cycadophyta (cycads) - 206 spp. Gnetophyta (gnetophytes) - 65 spp. Ginkophyta (ginkgo) - 1 sp. Ovule rests on exposed scale - “naked” Seed may be covered with sporophyte tissue at maturity Sperm may be flagellated but is delivered within pollen grain
Page 1: Kingdom Plantae Characteristics chl
Page 6 and 7: Characteristics of nonvascular plan
Page 8: Terms: Sporophyte - a multicellular
Page 11 and 12: Vascular Plants - have vessels (tub
Page 13 and 14: Phylum Pterophyta - the ferns, whis
Page 15 and 16: Whisk Ferns remnants of earliest va
Page 17: Phylum Lycophyta: Club Mosses World
Page 21 and 22: Conifer reproduction: heterosporous
Page 23 and 24: Conifer reproduction: Female cones
Page 26 and 27: Phylum Cycadophyta: Cycads Slow gro
Page 28 and 29: Phylum Ginkgophyta: Ginkgo Fossils
Page 30 and 31: Flower structure: modified stems be
Page 32 and 33: Angiosperm life cycle Male gametoph
Page 34: Double fertilization: One sperm nuc
Page 37: Classes of Angiosperms: Class Monoc

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