BIO SCI 94 Lecture Notes - Lecture 5: Penicillium, Green Algae, Carbon Cycle

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Nancy Burley

Document Summary

Bands of lignin provides structural support: tracheid. Elongated cell with pits in secondary cell wall to facilitate: root water movement. Underground appendage that absorbs water: vascular tissue allowed plants to defy gravity due to more structural support improved water conduction, 400 mya = first tree-size plant, ferns pteridophyta, 12,000 species. Mostly tropical large fronds, variable size: sori. Clusters of sporangia: seed plants 360mya innovations, seeds. Seeds: embryo + nutrition + seed coat: embryo can disperse far away from parent. Pangaea forms: dry interior climate warmed. Heterospory: 2 types of spores and associated structures, micro = male, mega = female, microspore > male gametophyte (pollen grain) > sperm, megaspore > female gametophyte > ova, gametophytes are not photosynthetic, they"re nourished by sporophyte. Pollen: tiny male gametophyte + sporopollenin, resistant to desiccation, high dispersibility (by wind or animals) Wood: product of secondary growth that increases water transport and strength. Pinophyta: monophyletic, dominant land from during mesozoic, 1000 species today.