Structure of Flowering Plants
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1 Structure of Flowering Plants
2 You need to know details on 1. Structure & function of root and shoot systems 2. Root zonations and all outer stem parts 3. Meristem function / location in root & shoot 4. Location of 3 tissue types in transverse and long sections of root and stem 5. Xylem & Phloem structure and function 6. Distinguish between Moncots and Dicots 7. Mandatory Activity.TS Dicot stem
3 3.2.1 Objectives 1 Label a diagram of the external parts of a typical flowering plant Shoot, root, stem, leaves, flower, fruit, seed. 2 State the function of the root and shoot 3 Identify tap and fibrous root systems 4 Explain the term Meristem and give its location in the stem and root 5 Name and give the function of four zones in a longitudinal section of a root
4 6 State the function of Vascular Tissue 7 Give the location of three tissue types, Dermal, Ground and Vascular, in transverse sections of the of the root and stem and leaf 8 Give the location of three tissue types, Dermal, Ground and Vascular, in longitudinal sections of the root and stem. 9 Identify and draw the structure of Xylem and Phloem and state their function 10 Distinguish between Xylem Vessels and Xylem tracheids, and between Phloem Sieve Tube Cells and Companion Cells
5 11 Identify Monocots and Dicots under the Headings Number of flower parts Vein pattern in leaf Arrangement of Vascular Bundles Number of Cotyledons in the seed Woody or Herbaceous 12 Mandatory Practical: Prepare and examine a transverse section of a Dicot stem under the microscope
6 What Flowering Plant typically have 1. Transport (Vascular) Structures 2. Roots 3. Stems 4. Leafs 5. Flowers 6. Fruits & Seeds
7 Plants are divided into two portions Over ground shoot system Under ground root system
8 Meristem An area of active cell division Apical meristems are found at the tip of the shoot and tip of the root and give an increase in length Lateral meristems are found around the edges of some plants and give an ìncrease in width
9 Root Functions Anchor Absorb Water Absorb minerals Transport absorbed materials to shoot Store food
10 Two Root Types 1. Tap Roots One main root growing from the radicle eg Carrot 2. Fibrous Roots Many equal sized roots arising from stem base eg grass
11 Four Root Zones Differentiation Zone Elongation Zone Meristematic Zone Protection Zone
12 Root Zones Differentiation Zone Here cells develop into 3 different types of tissue 1. Dermal tissue 2. Ground Tissue 3. Vascular tissue
13 Root Zones Elongation Zone Here cells increase in size
14 Root Zones Meristematic Zone Here new cells are produced by mitosis divisions
15 Root Zones Potection Zone A root cap protects the cells as the root pushes through the soil
16 Learning Check 1 1. Name the two types of root system 2. Explain the term Meristem 3. Name the four zones in a root 4. What is the function of the root cap?
17 Tissue location in the root (transverse section) Dermal Tissue Xylem Phloem Vascular Tissue Ground Tissue
18 Tissue location in the root (transverse section) Dermal Tissue Xylem Phloem Vascular Tissue Ground Tissue
19 Tissue location in the root (transverse section) (Center part of root) Xylem Phloem Vascular Tissue Ground Tissue
20 Tissue location in the root (Longitudinal section) Dermal Tissue Ground Tissue Vascular Tissue Ground Tissue Dermal Tissue
21 Stem Functions 1. Support the arial parts of the plant 2. Transport water and minerals from roots to leafs 3. Transport food from leafs to roots 4. Sometimes store food
22 Function of outer stem parts Terminal Bud Increase stem length Lateral Bud Grow side branches Lenticels Gas exchange
23 A= Terminal Bud B= Leaf Scar C= Scale Scar D= Lateral Bud Lenticels Year 3 Year 2 Year 1
24 Tissue location in stem (Transverse section) Dermal Tissue Xylem Phloem Vascular Tissue Ground Tissue
25 Tissue location in stem ( Longitudinal section) Dermal Ground Vascular Ground Vascular Ground Dermal
26 Learning Check 2.. Label the diagram
27 Leaf parts Some leaves do not have a petiole (They are called sessile leaves) Veins contain the vascular tissue
28 Leaf Functions 1. Photosynthesis 2. Transpiration 3. Gas exchange 4. Sometimes store food
29 Tissue Location in the Leaf Dermal Tissue Ground Tissue Vascular Tissue Dermal Tissue
30 Flower Function Sexual Reproduction
31 Vascular Tissue 1. Xylem Function Transport water Transport minerals 2. Phloem Function Transport food
32 Xylem Structure.Two types of Cell Xylem Tracheids Xylem Vessels On maturity both are dead, hollow and contain no cytoplasm Found in conifers Found in deciduous trees
33 Xylem Tracheid Structure Long cells tapered at both ends Pits in the walls allow water and minerals to move sideways from cell to cell Walls thickened with lignin for support
34 Xylem Vessels Structure Elongated cells Spiral lignin for strength No end walls form a continuous tube Pits to allow sideways movement of water
35 Phloem Structure 1. Sieve tube cells 2 Companion Cells Mature cells have no nucleus Nucleus controls activities of both companion and sieve tube cell Sieve plates Cytoplasm extends from cell to cell through the sieve plate
36 Phloem Longitudinal and Transverse sections
37 Example of Monocot and Dicot Monocot Dicot Grass Buttercup
38 Differences between Monocots & Dicots Number of cotyledons Arrangement of vascular bundles in the stem Monocotyledons One Scattered in the stem Dicotyledons Two Leaf venation Parallel Netted In a ring pattern Number of flower parts Woody or herbaceous In threes Almost all are herbaceous In fours and fives May be woody or herbaceous
39 Identification of Monocots & Dicots
40 Learning Check 3 1. State two functions of a leaf 2. Distinguish between xylem vessels and xylem tracheids 3. What is the role of the companion cell in phloem tissue 4. How is a transverse section of a monocot stem different to the TS od a Dicot stem?
41 End
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