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Download Plant structures and tissues - Ms. Pasic
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Monocots and Eudicots (Dicots) …the most abundant vascular plants Monocots and Eudicots (Dicots) …the most abundant vascular plants Classification of Plants PLANTS Kingdom - Subkingdom - Division Class Order Bryophytes (non-vascular) Tracheophytes vascular Mosses, liverworts, hornworts has xylem and phloem Tracheophytes – Vascular plants “Roots and Shoots” Above ground = shoots Under ground = roots Three tissue types PLANTS Dermal tissues Vascular tissues Ground tissues Major organs (non-reproductive) Leaf Stem Root Tracheophytes vascular has xylem and phloem Tracheophytes – Vascular plants “Roots and Shoots” Three tissue types Above ground = shoots Under ground = roots Dermal tissues Vascular tissues Ground tissues Major organs (non-reproductive) Leaf Stem Root Meristemic Tissue – only regions where cells divide repeatedly by mitosis (sites of growth) Tissue Description Function apical meristem at root and shoot tips primary growth – increases in LENGTH lateral meristem cylinders of tissue within roots and stems secondary growth – increases in diameter Tissue Dermal – a plants skin (protective) Description Function Epidermis -outermost cell layer in primary growth regions Produces waxy cuticle – prevents water loss and infection, restricts gas exchange Periderm -outside layer at sites experiencing secondary growth -replaces epidermis -often multiple cell layers Waterproofs roots and stems, protects inner tissues from structural damage Ground – all the internal nonvascular regions Tissue Description Function Parenchyma Spherical, thin-celled walls with large -Storage of nutrients, carbs (sugars vacuoles and starches) and water -heals wounds, regenerates plant parts Collenchyma Long cells with thickened cell walls Sclerenchyma -very thick secondary cell wall of cellulose and lignin -long cells -strength -supports primary growth regions -flexibility to withstand wind -Strength and rigidity Tissue Xylem Vascular – a plant’s circulatory system (transport) Description Function -tracheids long, tapered, thick-walled cells with Transports water and overlapping ends and pits (unthickened areas) on cell dissolved minerals, usually walls upward from roots to leaves -vessel elements – short, large diameter thick walled cells with open ends; stacked like barrels to make vessels Vascular – a plant’s circulatory system (transport) Tissue Description Function Phloem Sieve tube elements – long thin cells with tiny holes at the sloping ends (a sieve), and pits along side alls; no nucleus, ribosomes, Golgi, vacuoles, stacked to form sieve tubes -transports food (sugars etc) from leaves to the plant body Companion cells: direct sieve tubes Classification of Plants - Subkingdom - Division PLANTS Kingdom Bryophytes (non-vascular) Tracheophytes vascular Mosses, liverworts, hornworts has xylem and phloem Lycophytes (club mosses) Class Dicots Amborellales Order Spore producing Seed producing (ferns) Gymnosperms Angiosperms (seed (cone bearing) enclosed flowering plants) Eudicotyledons Dicots (2/3 of all angiosperms) Nymphaeales Other early Dicots angiosperms Dicots Monocotyledons (1/4 of all angiosperms) Eudicots (Dicots) Comparing Monocots and Eudicots/ Dicots Leaf Venation Actual pictures: http://theseedsite.co.uk/monocots2.html Eudicots (Dicots) Comparing Monocots and Eudicots/ Dicots Leaf Venation Actual pictures: http://theseedsite.co.uk/monocots2.html Eudicots (Dicots) Comparing Monocots and Eudicots/ Dicots Leaf Venation Actual pictures: http://theseedsite.co.uk/monocots2.html Eudicots (Dicots) Comparing Monocots and Eudicots/ Dicots Leaf Venation Actual pictures: http://theseedsite.co.uk/monocots2.html Eudicots (Dicots) Comparing Monocots and Eudicots/ Dicots Leaf Venation Actual pictures: http://theseedsite.co.uk/monocots2.html Eudicots (Dicots) Comparing Monocots and Eudicots/ Dicots Leaf Venation Actual pictures: http://theseedsite.co.uk/monocots2.html Eudicots (Dicots) Comparing Monocots and Eudicots/ Dicots Leaf Venation Actual pictures: http://theseedsite.co.uk/monocots2.html Practice Problems (HomeFUN!) Read section 13.2 – pages 544-550 Page 551 Questions 1-3, 5, 6, 9, 10, 13, 14
