2 What is a Plant? Multicellular Eukaryotic Photosynthetic Has cell walls containing celluloseLacks mobility
3 What did they evolve from? Green AlgaeSimilaritiescontain chlorophyllhave cell walls made of cellulosestore energy as starch
4 Original HabitatThe simplest plants live surrounded by water because water satisfies many of their needs:prevents cells from drying outgives structural supportprovides nutrientshelps with spore dispersal and meeting of sex cellsWith time, plants adapted to live on land
5 Adaptations for Land Adaptation Definition Advantage(s) 1. Cuticle waxy coating on the outer surface of plant cellsprevents the cell from drying out & acts as a barrier to pathogens2. Stomataopenings in the outer layer of leaves and some stems that allows the exchange of gasesenables exchange of gases for photosynthesis
7 Adaptations for Land Adaptation Definition Advantage(s) 3. Vascular Tissuestransport tissues that move nutrients and water throughout the plantfaster transport than with osmosis or diffusion & provide structure and support for the plant4. Reproductive Strategiesadaptations that allow sperm to meet egg without water (e.g. spores that have waterproof coverings, seeds)enable plants to reproduce without being surrounded by water
9 Plant Life CycleThe lives of plants consist of two alternating stages, or generations: a gametophyte generation and a sporophyte generation.The stage that produces gametes (sperm and eggs) is the gametophyte generation. It is haploid.The stage that produces spores is the sporophyte generation. It is diploid.
10 Plant Life CycleOne generation is dominant over the other. This means that it is larger and lasts longer.In most plants, the diploid sporophyte generation is dominant. In mosses, the gametophyte dominates.
12 No phyla, rather plants are organized into 12 divisions.
13 Non-Vascular Plants Include mosses, liverworts, & hornworts 1. Do not have true roots, stems and leaves- absorb water through cell walls; water moves via osmosis.2. No vascular tissue- no xylem and phloem to transport water and nutrients
14 Non-Vascular Plants 3. Small size - no support from vascular tissues 4. Depend on water for reproduction- water is needed for the sperm to swim to the egg
15 Vascular Plants1. Have true roots, stems and leaves 2. Contain vascular tissue - xylem transports water - phloem transports food and nutrients - run continuously through the roots, stems and the leaves
16 Vascular Plants 3. Larger size - vascular tissues provide support against gravity4. Cuticle- reduces water evaporation from leaves and some stems