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Anatomy. Organs Stem Root Leaves 1-Young dicot stem 2- Monoct stem 3- Old dicot stem 1- young dicot root 2- monocot root 3- old dicot root.

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Presentation on theme: "Anatomy. Organs Stem Root Leaves 1-Young dicot stem 2- Monoct stem 3- Old dicot stem 1- young dicot root 2- monocot root 3- old dicot root."— Presentation transcript:

1 Anatomy

2 Organs Stem Root Leaves 1-Young dicot stem 2- Monoct stem 3- Old dicot stem 1- young dicot root 2- monocot root 3- old dicot root

3 Identifying Stems and Roots Diagnostic: Characteristic : root stem pith small or absentsmall relative to pithpith and cortex 1- V.B. are of radial type 2- xylem is always exarch ( protoxylem is located near the periphery of the V.B.) 3- Absence of stomata and cuticle

4 Root anatomy Dermal tissue ( piliferous layer ) One layer, no stomata, no cuticle, the outer wall may extend into root hair Ground tissue Cortex Parenchymatous ( dicot.), some of them sclerenchyamtous (monocot.) Last layer of cortex termed as Endodermis which characterized by presence of casparian strips { casparian strips : deposits of suberin and lignin on radial wall only  Dicot. On radial +inner tangential  Monocot.

5 Monocot rootDicot. rootCharater Give rise to lateral root only Give rise to lateral roots and secondary meristems pericycle Numerous, 20From 2-8V.B. absentAppear later as a secondary meristems Cambium Well developedSmall or absentPith

6 Endodermis Casparian strips

7 young dicot root cortex Endodermis Metaxylem protoxylem phloem pith Starch

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9 monocot root cortex EndodermisMetaxylem protoxylem phloem pith Starch epidermis

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12 Old dicot. Root Look at key board

13 old dicot root Cork (phellem) Cork cambium (phellogen) Phelloderm 2 ry phloem Medullary rays Vascular cambium 2 ry xylem

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16 Organs Stem Root Leaves 1-Young dicot stem 2- Monoct stem 3- Old dicot stem 1- young dicot root 2- monocot root 3- old dicot root 1- dorsiventral dicot leaves 2- isobilateral dicot leaves 3- monocot leaves

17 Leaf anatomy Epidermis Upper and lower surface, stomata on both sides Ground tissue ( Mesophyll ) Specialized photosynthetic tissue In Dicot. Divided into  palisade Below epidermis and perpendicular to it, contain chloroplasts.  spongy tissue Loosely arranged, much less chloroplast than palisade. In Monocot. Mesophyll cells all are alike not diffrantiated into palisade and spongy Vascular tissue Main V.B. In the center ( midrib ), type of V.B. As the same of stem.

18 dorsiventral dicot leaves Epidermis Hybodermal layer Palisade Spongy tissue Collenchyma Pericyclic fibers Phloem Metaxylem Protoxylem

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20 Epidermis Palisade Spongy tissue

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22 isobilateral dicot leaves Epidermis Palisade Spongy tissue Collenchyma Pericyclic fibers Phloem xylem

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24 monocot leaves Epidermis Hybodermal layer (sclerenchyma) Ground tissue (parenchyma) Bundle sheath (fibers) Phloem Metaxylem Protoxylem Closed collateral V. B.

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28 Practical work : We will do transverse section in a leaf : tools  razors  Slides and covers  Pith

29 Thank you Good luck


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