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Stems and Leaves
Stem internal structureA vascular bundle is a cord of xylem and phloem running through the stem (it’s thesame one that is found in the root)
Stem Internal StructureInside each bundle, the phloem is often positioned facing the stem surface; the xylem is positioned facing the stem center.
Stem Internal StructureThe vascular bundle is surrounded by ground tissue. Dermal tissue is on the outside of the stem.
Leaf Leaves represent a large surface area that is exposed to sunlight and carbon dioxide for photosynthesis
Leaf Internal Structure
Leaf Internal StructureThe cuticle helps to prevent water loss.
Leaf Internal StructureMesophyll is parenchyma specialized for photosynthesis
Leaf Internal StructureThe palisade layer is exposed to direct sunlight Cells in the lower part of the leaf are loosely arranged in the spongy layer (air sacs participate in gaseous exchange)
Leaf Internal StructureVeins (vascular bundles of xylem and phloem) form a network for movement of water, solutes and photosynthetic products throughout the mesophyll
Leaf Internal StructureStomata are located mostly on the lower epidermis.
Leaf Internal StructureStomata are surrounded by two guard cells which open and close to regulate transpiration.
Leaf Internal StructureStomata are typically more abundant on the lower surface of the leaf, and sometimes only found there (except for floating aquatic plants like water lilies)
End Show Slide 1 of 32 Copyright Pearson Prentice Hall Biology.
Leaves - Overview Shoot system Leaf Blade Petiole
Slide 1 of 32 Copyright Pearson Prentice Hall 23–4 Leaves.
Chapter 23 Biology – Miller • Levine
End Show Slide 1 of 32 Copyright Pearson Prentice Hall 23–4 Leaves.
Cycling of Matter in Living Systems 3.3 The Leaf Tissue and Gas Exchange.
KEY CONCEPT Leaves absorb light and carry out photosynthesis.
Plant Tissues and Organs. Plant Tissues All plants are made up roots, stems, leaves and flowers. These structures are made up of cells These cells are.
Leaf Structure and Function. Basic functions 1. Photosynthesis: process which plants use the energy from sunlight to produce sugar (for themselves) 2.
NAME: DATE: PERIOD: FOCUS on the LEAF Plants are organisms, made of two organ systems: the shoot system, and root system The plant leaf is an organ of.
Chapter 23 Roots 23:2.
LEAVES SBI 3C: JANUARY LEAF FUNCTIONS 3 main functions: Move oxygen and carbon dioxide in and out of plant Evaporation of water to move more water.
Leaves Pages 578;
Plant Structure. Plant Tissues A tissue is a group of cells organized to form a functional unit or a structural unit Plants have 3 tissue systems: Ground.
Photosynthesis (leaf structure)
Lesson Overview 23.4 Leaves.
Tendril – modified leaf found in many vines (peas, pumpkins) Carnivorous plants – modified leaves that trap insects Spines – protect plant.
9.1 Leaves. IB Assessment Statement Draw and Label diagrams to show distribution of tissues in the stem and leaf of a dicotyledonous plant Explain the.
23–1 Specialized Tissues in Plants
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