Explanation: The leaf blade is the expanded portion of a leaf. The flattened lamina or leaf blade is supported by veins and veinlet’s which contain vascular tissues for conduction of water, mineral salts and prepared food. Influence of Length of Daytime on Flowering of Plants, Describe with a Labelled Diagram of a Typical Ovule, Road infrastructure and driver behavior can create complex road networks, Scientists develop Single Photons from a Silicon Chip for quantum light particles, Physicists use antiferromagnetic rust for Faster and Efficient Information Transfer, Crab armies can be a key issue in coral wall preservation, Beaches cannot be extinct if sea levels continue to rise. Bars, 100 μm. Dorsal. Green leaves of the plant are collectively cold foliage leaves. the outside layer of a leaf is called the epidermis tissue. In monocotyledons, the leaf base expands into a sheath covering the stein partially or wholly. A leaf (plural leaves) is the principal lateral appendage of the vascular plant stem, usually borne above ground and specialized for photosynthesis.The leaves and stem together form the shoot. They are the most important vegetative organs for photosynthesis. The leaf is attached to the stem by the leaf base and may bear two lateral small leaves like structures called stipules. midrib . Question 14. …, show the steps of nitrogen cycle with the help of a flowchart , define sexsemen give me fast answerfasttttttttt, Write short notes on the fertilization in Ectocarpus. Central/Ventral. The Development of Kranz Anatomy can be considered in three Distinct Stages The initiation of procambium. They come in different shapes, sizes, and colors, and are generally dorso-ventrally flattened and thin.They are the main organ responsible for photosynthesis as they contain chlorophyll.. Browse more Topics under Anatomy Of Flowering Plants e.g. Apex. A leaf is the green, flat lateral outgrowth in plants. © copyright 2020 QS Study. Full size image. (i) The leaf is a lateral dissimilar appendage of the stem. The flattened leaves have a large surface area for sun exposure. The blade is usually green in colour for the presence of chlorophyll. The blade is protected by a waxy layer on the top part of the epidermis called the cuticle. is the most prominent vein running from base to apex and present in the middle of leaf blade. Monocot leaves have which of the following venation patterns. Leaf Structure And Function Lab. The main functions of the root system are absorption of water and minerals from the soil, providing a proper anchorage to the plant parts, storing reserve food material and synthesis of plant growth regulators. Epidermis – The leaf's outer layer and protective "skin" surrounding leaf tissues. The green expanded part of leaf is called as: [A]. In a… Posted at 02:39h in Uncategorized by 0 Comments. i hope it is helpful to you dear friend . Some leaves like those of the pea, sensitive plant, mango have swollen leaf-bases. A leaf consists of three parts— leaf base, petiole and lamina. (v) The growth of leaf is limited. A leaf is often flat, so it absorbs the most light, and thin, so that the sunlight can get to the chloroplasts in the cells. 1. please mark me as braillist answer (iv) It is exogenous in originand develops from the swollen leaf primordium of the growing apex. In majority of the dicotyledonous plants, the direct elongation of the radicle leads to the formation of primary root which grows inside the soil. The leaves and stem together form the shoot. The lamina or the leaf blade is the green expanded part of the leaf with veins and veinlets. function of a leaf. Our study of photosynthesis will not be complete without knowing more about the structure of a leaf. In many monocotyledons and a few dicotyledons the leaf-base grows into a sheath partly or wholly surrounding the stem. Inside the blade the following parts can be distinguished: – The veins: are a like wrinkles or pipes running along the blade. What is a staminode? In monocotyledonous plants, the leaf base is expanded to a sheath which completely or partially covers the stem. The ‘flat portion’ of the leaf is called the leaf blade or lamina or epipodium. Types of leaf: Leaves are of two types. Leaf, in botany, any usually flattened green outgrowth from the stem of a vascular plant.As the primary sites of photosynthesis, leaves manufacture food for plants, which in turn ultimately nourish and sustain all land animals. May this ANSWER will help you plz mark has brainliest. All rights reserved. There is, usually, a middle prominent vein, which is known as the midrib. The Leaf-Base: It is by no means a conspicuous part of the leaf. Blade (Lamina) - green expanded portion of leaf - part that carries on the principal functions, photosynthesis, transpiration, and respiration. Parallel. It is the most important part of a leaf as it bears the stomata which helps in the passage of air. (iii) Generally there is always an axillary budin the axil of a leaf. Most leaves have stomata, which open and close.They regulate carbon dioxide, oxygen, and water vapour exchange with the atmosphere. Leaf blade or lamina [B]. The Dorsoventrally flattened part of Leaf is called Leaf Lamina Or Leaf Blade. the epidermis is made of flat cells. Leaves originate from shoot apical meristems and are arranged in an acropetal order. Leaf base: The part of the leaf with which it is attached to the stem is called the leaf base. Lamina. Its main functions are photosynthesis and gas exchange. Botanically, leaves are an integral part of the stem system. These green chloroplasts reside on the leaf's interior. (vii) A leaf has three main parts – Leaf base, petiole and leaf lamina. The surface of the leaf that can be touched is actually the epidermis, which protects the processes occurring beneath. Purple color, xylem; blue color, phloem. Leaves are collectively referred to as foliage, as in "autumn foliage". Bars, 100 μm. I: Simple Leaf – A life with undivided lamina is known as simple leaf. Exchange. 62, a). Cite some other examples of modifications of plant parts … Leaf Blade or lamina or epipodium: The flattened, expanded part of the leaf is called the leaf blade. Leaves attached via a petiole are called ‘petiolate’, leaves which attach directly are called ’sessile’. Long thin flexible petioles allow leaf blades to flutter in wind, thereby cooling the leaf and bringing fresh air to leaf surface. The axillary bud later develops into a branch. It is further divided into three parts: i) leaf apex – the tip of the leaf blade, ii) leaf margin – the edge of the leaf and, iii) leaf veins – the small channels or capillaries, which are further subdivided into venules. Such a leaf- base is called pulvinus (Fig. The leaf lamina is the green expanded part of the leaf with veins and veinlets. In banana, the so-called stem consists of the leaf sheaths. The Dorsoventrally flattened part of Leaf is called Leaf Lamina Or Leaf Blade. A leaf is attached to the stem of the plant by a petiole. Blades differ in the types of edges, the patterns of the veins and the number of blades per leaf. Anatomical observation by SEM indicated that the two types of leaves in Pinaceae each have distinct structural characteristics. Lamina (= epipodium) or leaf blade is the terminal thin, expanded, green and conspicuous part of the leaf which is specialized to perform photosynthesis. Both petioles and phyllodes can develop the ability to photosynthesize and function as foliage. Is the flattened, green, expanded portion of a leaf. Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials. What is a bract? The petiole help hold the blade to light. tissues are layers of similar cells. Primary function of stomata is. A thin, flat part of the leaf that extends off the end of the petiole. Leaf-blade or Lamina It is the thin, flat part of the leaf that is typically green in color. Leaf. On some plants, the petiole has changed because of environmental reasons so that it looks just like a leaf and is called a phyllode. The leaf is a lateral, generally flattened structure borne on the stem. Answer: Staminode is a sterile stamen, that does not produce pollen grains. This is the stalk which may attach the leaf to the stem; some leaves attach directly and don’t have petioles. It is a green, thin, flattened and expanded part of leaf with veins and veinlets traversing through its surface. b. bacterial blight of rice. Green color, palisade tissue; red arrow, the direction of cell arrangement. In some leguminous plants the leatbase may become swollen, which is called the pulvinus. part facing the sun. Long thin flexible petioles allow leaf blades to flutter in wind, thereby cooling the leaf and bringing fresh air to leaf surface. Leaf base-The leaf is attached to the stem by the leaf base and may bear two lateral small leaf like structures called stipules. Attached via a petiole surface the green expanded and flattened part of leaf is called extent of incision of lamina varies in leaves. Green as it contains chlorophyll which is called pulvinus ( Fig ( ). Kranz Anatomy can be distinguished: – the veins and veinlets node bears! Bears a bud in its axil main stems like branches and flower stalks ( known as midrib! 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