BIOL 1108 Lecture Notes - Lecture 12: Green Algae, Flowering Plant, Double Fertilization
Document Summary
Bryophytes form persistent, photosynthetic gametophytes and small, unbranched sporophytes; today they grow in environments where the ability to pull water from the soil does not provide an advantage. Spore-dispersing vascular plants today are primarily small plants that grow in moist environments, but in the past included tall trees. Gymnosperms produce seeds and woody stems and are most common in seasonlly cool or dry regions. Angiosperms are distinguished by flowers, fruits, double fertilization, and xylem vessels; their diversity is the result of traits that increase the efficiency of completing their life cycle and building their bodies. Angiosperms make up approximately 90% of all plant species found today. 90% of extant plants are flowering plants (angiosperms) Ferns and horsetails drive lycophyte diversity down. Angiosperms knock down all other plant diversity. Bogs are dominated by peatmoss (i. e. , sphagnum) Sphagnum can hold 2-400x its dry weight in water, and acidify the water => no bacterial growth.