BAI GIANG VE THUC VAT

Early Earth and Green-world Earth has been call the Blue Planet, but it would be just as accurate to call it the Green Planet Content • Early Earth and chemical evolution (pp: 15-36) • Evident of life style: stromatolites • Oxygen and Ozone formation • Evolution of land plant (pp: 546-551) • Quiz Early Earth and Original of Life • chemical evolution: + pattern component: Early in Earth history, simple chemical compounds combine to form more complex carbon – containing substance that accumulated in the Ocean + process component: Complex carbon containing compounds formed because energy in sunlight and extremely hot water was converted to chemical energy in the form of new chemical bonds Original atmosphere on the Earth The planet: bombarded Atmosphere: hydrogen, carbon dioxide…but no free oxygen Water and the fitness of environment • The polarity of water molecular results in hydrogen bonding • Water is the solvent of life • Organisms depend on the cohesion of water molecules • Water moderate temperature on the Earth • Oceans and lakes don’t freeze because ice floats Solid water (ice) Liquid Chemical evolution hypothesis Carbon & molecular diversity of life • Almost molecules found in organisms contain this atom • Variation in carbon skeletons contributes to the diversity of organic molecules • Functional groups contribute to molecular diversity of life The important of oxygen • Need for respiration of living organism • Made ozone layer • Filter UV Evidences of life: stromatolites Stromatolites at 3.5 billion years old Stromatolite: precipitate sediment (stone, rock) with microorganism Stromatolites: alternating layers of CaCo3 and gelatinous material Str In modern life Str in 2.4 billion year old rock Organic or inorganic compounds in deposit • Morphology of known microoganism that still exist today • Compeare structure of ancient and new stromatolites • Ratio C13 and C12 inside stromatolites C13 in inorganic limestone and organic life stone • Bya ago, photosynthetic organisms release O2 to atmosphere • 2.5 Bya ago, enough O2 accumulated • O2 formed O3 layer Early life evolved without protective atmospheric ozone layer • Prokaryote: 3.5 – 2.2 Bya • Eukaryotic life: 2.1 Bya • Multicellular Eukaryotic: 1.2 Bya • Plants, fungi, animal: 500 Mya Green plant photosynthetic pigments thylakoids arrangement similar cell wall, sperm, peroxisome chloroplast synthesize starch Evolution of land plant 475 mya 416 First evidence of land plant: Cuticle, spore, sporangia 359 Morphological innovation: stomata, vascular tissue, leave 299 Extensive coal – forming swaps 145 Both wet and dry environments blanketed with green plants for the first time present Diversification of flowering plants Morphological diversity in land plant Seed plants Seedless-vascular plants Non-vascular plants Lack vascular tissue to conduct water and support (moss) Have vascular tissue but not make seed (fern) Have vascular tissue and make seed (flowering plant) [...]... sporangia 359 Morphological innovation: stomata, vascular tissue, leave 299 Extensive coal – forming swaps 145 Both wet and dry environments blanketed with green plants for the first time present Diversification of flowering plants Morphological diversity in land plant Seed plants Seedless-vascular plants Non-vascular plants Lack vascular tissue to conduct water and support (moss) Have vascular tissue but do... stromatolites C13 in inorganic limestone and organic life stone • 3 5 Bya ago, photosynthetic organisms release O2 to atmosphere • 2.5 Bya ago, enough O2 accumulated • O2 formed O3 layer Early life evolved without protective atmospheric ozone layer • Prokaryote: 3.5 – 2.2 Bya • Eukaryotic life: 2.1 Bya • Multicellular Eukaryotic: 1.2 Bya • Plants, fungi, animal: 500 Mya Green plant photosynthetic pigments thylakoids... Morphological diversity in land plant Seed plants Seedless-vascular plants Non-vascular plants Lack vascular tissue to conduct water and support (moss) Have vascular tissue but do not make seed (fern) Have vascular tissue and make seed (flowering plant)