Ø  They are located inner to the pericycle. Differentiate dorsiventral and isobilateral leaf. Ø  Multicellular hairs (called trichome) are usually present in the epidermis. Leaves are the main photosynthetic organs of the plant. Ø  It is arranged towards the centre of the stem. Anatomy of leaf is the detailed study of internal structure of a leaf, usually revealed by its dissection. What is meant by isobilateral leaf? Ø  Secretory cavities occur in the cortex of Eucalyptus. Woody or Herbaceous Practical activity. Ø  Xylem in the VB is differentiated into: Ø  Protoxylem is the first formed part of xylem in the VB. Ø  The lower epidermis is similar to the upper epidermis. Ø  The vascular bundles composed of (I) Xylem placed inner to cambium; and (II) Phloem placed outer to cambium. In this article, learn the difference between monocot and dicot leaves. Ø  Xylem is located towards adaxial side and the phloem is located towards the abaxial side, Ø  Cambium sometimes present in the midrib vascular bundles. Ø  It is arranged towards the exterior of the stem. Ø  Vascular tissue is irregularly distributed in the mesophyll. o   Stomata in stem facilitate gaseous exchange. Ø  In very young stem, the collenchyma is poorly developed. Define hypostomatic leaf. In a sense, they are to plants what veins and arteries are to animals. 12. Dicot Leaves (microscope) Label xylem and phloem. Plants with spiral phyllotaxis have one leaf per node, and the angle of divergence between leaves is 137.5° (Fig. of divergence between successive sets of leaves depends on the leaf number per set. Ø  This thickening is called casparian thickening (casparian band, casparian layer). Ø  The mesophyll tissue is differentiated into upper palisade and lower spongy tissues. Ø  Anatomically a dicot leaf shows the following tissue zones: Ø  Upper epidermis composed of a single layer of parenchymatous cells. Ø  Laticifer cells occur in the cortex of latex producing plants. It consists … Ø  It is composed of loosely packed parenchymatous cells with plenty of intercellular spaces. The epidermis is is also transparent and very thin to allow maximum light penetration. Ø  Vascular tissue in the leaves is called vein. b). (absorption of CO2 and release of O2 and water vapour). Define epistomatic leaf. Ø  If distinct, the endodermis is uniseriate (single layer) with barrel shaped cells. Ø  They show reticulate or pitted thickening (advanced type). Dicot leaves have thick cuticle at the upper layer and thin cuticle at lower layer whereas monocot leaves have uniform cuticle on both the surfaces. Ø  The casparian band is composed of suberin and lignin, both of them are impervious to water. Special features of cortex in some plants: Ø  In hydrophytes, the cortex is with plenty of air cavities (aerenchymatous). Ø  In majority of plants, the cortex is differentiated into many zones. Ø  Large number of intercellular spaces is present. Give example Ø  The cutin over the cell wall occurs as separate layer called cuticle. Ø  Cortical cells also store ergastic substances. Ø  Cells of the endodermis accumulate plenty of starch as grains. 2. Endodermis, a). many magnoliids). 2, Wiley Eastern Private Limited, New Delhi, Ø  The primary structure of a typical dicot stem, Ø  Structure of vascular bundle in dicot stem. Ø  Xylem is the water and minerals conducting tissue of vascular bundles. Anatomy of Dicot Root- Primary Structure (with PPT), @. Algae / Blue-Green Algae (Cyanophyta) Algae / Brown Algae (Phaeophyta) ... Spermatophyta / Dicot Leaves View All. d). Ø  Cells of this region are chlorenchymatous (parenchyma with chloroplasts). Ø  Epistomatic leaf: stomata present only on the upper surface of the leaf. Internode is the distance between two adjacent nodes of the stem. Dicot Leaf Labeled Diagram. Ø  This is the tissue inner to outer cortex. The leaf is the main site of photosynthesis in green plants. What is leaf blade? Ø  Mesophyll is the chloroplast containing portion of the leaf. Practical identification points of Dicot Leaf (Example: Ixora, Hibiscus, Mangifera, Ficus), Ø  Mesophyll is differentiated into upper palisade and lower spongy tissue, Ø  Vascular bones with parenchymatous bundle sheet. Ø  The mesophyll tissue is undifferentiated. Ø  Vascular bundles, conjoint, open, collateral or bicollateral. Ø  The outer tangential wall of epidermal cells is thicker than other walls. Ø  Endodermis is the innermost layer of cortex. Explain the structure of vascular tissue in dicot leaf. With a suitable labeled diagram, explain the anatomy of a dicot leaf. The mono-cots (also known as mono-cotyledons) form one first leaf, while the dicots (dicotyledons) form two. Venation pattern: Monocot leaf shows parallel venation, i.e. Ø  Spongy tissue occupies below the palisade tissue. Like any other multicellular living thing, leaf structure is made up of layers of cells. masuzi April 26, 2020 Uncategorized 0. Outer cortex Ø  In dicot leaves the mesophyll is differentiated into two zones. Difference Between Meristematic Tissues and Permanent Tissues, @. Microscope Slides - Plants, Fungi, Slime Molds, Lichens & Algae. 9 Compare and contrast the flowers of eudicots and monocots. What are differences between dicot and monocot leaf? Sort by We Recommend New Arrivals Best Sellers Price, Low to High Price, High to Low Name - A-Z Name - Z-A Lilac Leaf, c.s., 12 µm Microscope Slide Item #303790 Ø  The main function of spongy tissue is to perform gaseous exchange. Ø  Ground tissue differentiated to hypodermis, cortex and stele. Using a microscope, it's possible toview and identify these cells and how they are arranged (epidermal cells,spongy cells etc). Ø  Composed of usually one or two layers of cells. Plants belonging to each group have a number of features in common, such as the leaf and root structure, the strength of the stem, the flower structure and flower parts. Ø  The cells are loosely packed with plenty of intercellular spaces. Ø  Usually the cortex in dicot stem composed of FOUR zones. Ø  Cells are compactly packed without any intercellular space. Ø  In xerophytes, the outer cortical cells forms palisade like tissue for photosynthesis, since these plants usually lack leaves. Ø  Sclerenchymatous pericycle forms the bundle sheath of the vascular bundle in most of the dicot plants. b). Ø  Endodermal cells have characteristic thickness in radial and inner tangential walls. Ø  The pericycle in the stem of different plants may be: o   Mixture of parenchyma and sclerenchyma (alternating bands). Figure 5.3: A comparison between monocots and dicots. Ø  The epidermis of young stem also contains few stomata. Some differences between monocots and dicots are summarised in Figure 5.3. Ø  Usually, chloroplasts absent in the hypodermis. Ø  Epidermal hairs or trichomes are also present on the epidermis. Ø  Hypodermal layer provides mechanical support. Ø  Provide inter-fascicular cambium during secondary growth. The basis of comparison include: […] Ø  How dicot stem is different from the monocot stem? Ø Anatomically the dicot stem has the following regions: (1). Ø  Cells are compactly packed without any intercellular spaces. 13. Ø  It is a complex tissue, composed of tracheids, vessels, fibres and parenchyma. Ø  The cells of the tracheary elements are with large lumen than that of protoxylem. Give example. b. Ø  Sclerenchymatous patches occur in the cortex of Eucalyptus, Eugenia, Ficus. Ø  In xerophytic plants, the hypodermis is sclerenchymatous. 5. Thus, the endodermis is also called starch sheath or starch band or starch layer. Give example View Details. 4 Describe the fundamental characteristics of a eudicot. Ø  Cuticle present, but relatively thinner than that of upper epidermis. Identify Monocots and Dicots under the headings. Ø  They can store food material as starch grains. What are areoles? Dicots have flower parts in multiples of fours or fives like (transverse section) took through the internode of the stem. Ø  In C4 plants, the bundle sheath cells contain chloroplasts. Give example Ø  The main function of palisade tissue is to perform the photosynthesis. Primary Growth Differs in Monocot and Dicot … Epiblema or Epidermis - It is the outermost unilayered with several unicellular root hairs. Enter your e-mail address. 10 Label the diagram to the right. Ø  Xylem composed of vessels, tracheids, fibres and parenchyma. However, some leaves may have different colors, caused by other plant pigments that mask the green chlorophyll. Petiole: the stack of leaf, Ø  Based on the differentiation of mesophyll, two categories of leaves are present among Angiosperms. Ø  Prakash J.J., 2000, Test Book of Plant Anatomy,  Ed. Ø  Epidermal cells are devoid of chloroplasts. Ø  NOT distinct in the stem of Gymnosperms and Angiosperms. c). Ø  It is located towards the inner side of vascular bundles. 4. What is petiole? Monocot leaves have their leaf veins arranged parallel to each other and the long axis of the leaf (parallel vennation). What is meant by isobilateral leaf? Ø  Vascular tissue composed on xylem and phloem. 2, Emkay Publications, New Delhi, Ø  Esau K, 1965, Plant Anatomy, Ed. Ø  Xylem endarch (protoxylem arranged towards the centre). Ø  Outer wall of the cells are thick and covered with a thick layer of cuticle. Ø  Numerous stomata are present on the lower epidermis. Number of Cotyledons in the seed. Ø  Sometimes the parenchymatous cells undergo secondary wall thickening. Ø  Cells are closely packed without any intercellular spaces. Ø  The Aerenchyma helps in gaseous exchange and provides buoyancy of to plants. Pith. Richard Dawkins. The structure of a leaf has adaptations so that it can carry out photosynthesis effectively. occurs in the cortex. Pericycle 7. Ø  Cells of the spongy tissue contain chloroplasts; however, the amount of chloroplasts is less than that of palisade tissue. Ø  What are the functions of medulla and pith? D. Temporary slide preparation of monocot root. Ø  They composed of more tracheary elements then protoxylem. c). To do this a compound microscope is required given that itallows for higher magnification. Ø  Usually, 6 to 8 vascular bundles are present and they are arranged as broken ring in the ground tissue. Pits: Ultra-structure, Difference Between Simple Pits and Bordered Pits, @. Ø  Usually, the pith composed of parenchymatous cells. Epidermis (2). Inner cortex What are lithocytes? Ø  Bundle sheath may have extensions which may reach both the upper and lower epidermal layers. Monocots have flower parts in threes or multiples of threes as shown in the flowers to the left. Aug 25, 2019 - Anatomy of a Typical Dicot Dorsiventral Leaf Cross Section (CS) Under Microscope with Labelled Diagram, Description and PPT Ø  Cambium present in the VB is called as fascicular cambium or vascular cambium. Fun Fact: Leaves are the food processing factories for trees. *"Dicots" are now referred to as Eudicots, although the "dicot" features described below pertain to many non-monocot plants (e.g. 11. Leaf is the main place where photosynthesis occurs. (adsbygoogle=window.adsbygoogle||[]).push({}). Section of dicot root as seen under the microscope. Nov 21, 2014 - This Pin was discovered by Sue Park. Ø The anatomy of dicot stem is studied by a T.S. base of the leaf and are parallel to each other in each lobe of the leaf. 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