Leaves, Roots, Stems - Western Oregon University

Leaves, Roots, Stems - Western Oregon University

Leaves, Roots, Stems Plant organs and their functions Leaves Leaf Parts Two major parts to the leaf: Blade Petiole

Leaf microanatomy Epidermis and cuticle do what? Mesophyl does what? Veins do what? Guard cells in the lower epidermis do

what? Photosythesis The purpose of photosynthesis is to produce organic (carbon-based) molecules (such as sugars). The plants use these molecules for two purposes: As an energy source As building material

Roots Types of root systems Taproot systems: main root, lateral branches. Fibrous root systems: lose the primary root,

replaced by many smaller roots. Root Anatomy Parts of a root: Root cap Root meristem Zone of elongation

Zone of maturation Roots: Epidermis Root epidermis lacks a cuticle, and is porous. Usually has many root hairs. Water enters

through membranes of epidermal cells or through spaces between cells. Roots: Cortex The cortex layer is made up of

parenchyma cells. What is the main function of these cells? Endodermis separates the cortex from the vascular cylinder. Roots: vascular cylinder

Casparian strip around endodermis cells controls water movement. Why? Pericycle: layer of parenchyma cells, inside of endodermis, from which branch

roots can arise. Roots: vascular cylinder Vascular cylinder contains: Phloem: what does phloem do? Xylem: What does xylem do?

Stems Stems: Epidermis In herbaceous plants and young woody plants, the stem is covered with epidermis. Epidermis

secretes cuticle, has stomata, and may be photosynthetic. Stems: Cortex and Pith Cortex layer contains parenchyma cells and vascular

bundles. Pith makes up the center of the stem, and is absent in hollow stems. Stems: vascular tissue Vascular bundles are in the cortex.

Between the xylem and phloem is the vascular cambium, a meristem layer. What is it for? Stems: Secondary growth

Secondary growth is seen in woody plants. This kind of growth produces stronger, thicker stems from the vascular cambium and cork cambium.

Stems: wood and bark What tissue makes up the wood of a tree trunk? (hint: water flows there.) What tissue makes up the green bark? (hint: sap flows there.)

Dead cork cells make up the bark. Stems: Annual Rings Trees in temperate zones grow at different rates in different seasons, causing annual rings to form.

In some parts of the tropics, if seasons vary little, tree rings are indistinct.

Recently Viewed Presentations

  • Peer Review - Compliance with framework of Quality Control ...

    Peer Review - Compliance with framework of Quality Control ...

    Peer Review - Compliance with ... (SA 300) to ensure that the ET had spent adequate time and effort in properly planning the audit - commensurate with the size and complexity of the entity audited . ... - if there...
  • PRAXIS CARE ORGANISATIONAL STRUCTURE SENIOR LEADERSHIP TEAM NEVIN

    PRAXIS CARE ORGANISATIONAL STRUCTURE SENIOR LEADERSHIP TEAM NEVIN

    Elaine McCrea. Head of Development. UK. AineMurnin. Temp Head of Operations. Southern & South. Eastern Regions. John McEleney. Head of Development. ROI (North West) Karen Harding. Temp Head of Operations. Southern & Western Regions. Rosaleen Hannon. Head of Operations. ROI....
  • Ch. 3 - Northern Highlands

    Ch. 3 - Northern Highlands

    Can shape our interpretation of events Priming Demo Group 1: Unscramble the letters to make words: ocw nhe erohs ogd tca sfih eap tgoa Group 2: Unscramble the letters to make words: tluetec rortac neab rcon yecler ottmao eap cbocrlio...
  • Japan's ABC Vocabulary

    Japan's ABC Vocabulary

    * * * * * * * * * * * * * * * * * * * * * * * * * * * A Anime B Big Buddha C Chopsticks D Dragon E Edamame F Fish...
  • Chapter 20: The Transition Zone

    Chapter 20: The Transition Zone

    Multiple countries share the river systems that lead into this lake . Good for irrigation and fisheries . Negative consequences?? Water Systems. Niger River _____ Means of transportation _____-triangular-shaped section of land formed as waters of a river slow down...
  • Jacques Malan Consultants and Actuaries

    Jacques Malan Consultants and Actuaries

    other Office Bearers Pension Fund. Mundial Seguros. Namib Mills. Namibia Beverages (Coca-Cola) Namibia Broadcasting Corporation. Namibian Medical Care. NamPower. Namport. NamWater. Pelagic Fishermen Retirement Fund. PSEMAS. Registrar of Pensions - Botswana. Retirement Fund for Local Authorities of Namibia. Social Security...
  • News Article - menifee.k12.ky.us

    News Article - menifee.k12.ky.us

    Format of News Article Headline—use action verbs and important nouns and adjs. Byline—by your name Lead—first sentence/ paragraph—include 5W-H Qs—put most important first—attract the reader's attention Body—explanation, details, info., quotes, facts, etc. Background information—brief info leading up to or supporting...
  • Virtual Temperature: Tv or T*

    Virtual Temperature: Tv or T*

    Objective: To find some useful relationships among air temperature (T), volume (V), and pressure (P), and to apply these relationships to a parcel of air. Ideal Gas Law: PV = nRT See R&Y Chapter 1 Salby 1.2 (Chapter 1Section 2),...