Presentation on theme: "KINGDOM PLANTAE Why are they relevant? Photosynthesis provides Oxygen Plants are the basis of all food chains Clothing, medicine, textiles, etc. Interlocking."— Presentation transcript:
Why are they relevant? Photosynthesis provides Oxygen Plants are the basis of all food chains Clothing, medicine, textiles, etc. Interlocking roots prevent erosion
Where did they come from? Fossil record is sketchy (no hard parts to fossilize) Most scientists believe they came from green algae (protists) and moved to land to get closer to the sun…
Plant Characteristics All are Multicellular Eukaryotes All contain chloroplasts Most are non-motile
Groups of plants: Seedless Bryophytes: Mosses, liverworts and hornworts. –One cell thick, very primitive, must remain wet. –No veins to carry food and water, they use osmosis instead –Need water for sperm to swim to egg in reproduction (no seeds)
Groups of Seedless Plants Continued… Ferns –Leaf is called a frond –Still no seeds, sperm swim to egg –Have vascular tissue, so they can grow taller Types of vascular tissue: –Xylem carries water up from roots –Phloem carries sugar down from leaves
Groups of plants continued… SEED plants Vascular SEED Plants: –Gymnosperms: “naked seed” evergreens like pine and spruce. Seed does not have any protection and develops on a cone. –Angiosperms: “seed in a vessel” or a fruit. Flowering plants that use fruits to protect the seeds
Angiosperms Annual v. Perennial Anything that has seeds is a FRUIT!! –Peppers? YES! –Pumpkins?YES! –Tomatoes?YES! –Corn?YES!
Two divisions of angiosperms: Monocots: have ONE seed leaf (Cotyledon) and leaves have PARALLEL veins. –Example: grass or palm trees Dicots: have TWO seed leaves and leaves have branched veins. –Example: oak tree (deciduous) or rose
Plant Organs: Roots, stems, leaves and flowers Roots: Collect water –Tap roots or fibrous –Root hairs increase surface area and absorption of roots
Plant Organs Stems: Transport food down the stem in the phloem and water up the stem from the roots to the leaves in the xylem.
Plant Organs Leaves: Covered with waxy cuticle, filled with chloroplasts, get held broad to the sun so they can easily photosynthesize, have veins of xylem and phloem. –Contain stomata (a pore) surrounded by 2 guard cells which let CO 2 in depending on whether or not the plant has enough water (turgidity) Wilted = closedfull = turgid and open