A leaf is attached to the stem of the plant by a petiole. In many monocotyledons and a few dicotyledons the leaf-base grows into a sheath partly or wholly surrounding the stem. Venation. They are borne at the nodes of the stem. In a… What is a staminode? Prepare well for your science texts or coursework according to … It can be a useful way to organise data to find the median, mode and range of a set of data. Leaves are the main organs of food production and photosynthesis in green plants. Usually, the leaf base is slightly swollen, but when it is distinctly swollen, it is said to be pulvinus.. Lamina (= epipodium) or leaf blade is the terminal thin, expanded, green and conspicuous part of the leaf which is specialized to perform photosynthesis. A stem and leaf diagram shows numbers in a table format. (iii) Generally there is always an axillary budin the axil of a leaf. Leaves are collectively referred to as foliage, as in "autumn foliage". Leaf Blade or lamina or epipodium: The flattened, expanded part of the leaf is called the leaf blade. Anatomical observation by SEM indicated that the two types of leaves in Pinaceae each have distinct structural characteristics. (v) The growth of leaf is limited. The blade is the expanded part of the leaf. Eudicot leaves are similar to monocot leaves in cross section, except that the mesophyll consists of. Green leaves of the plant are collectively cold foliage leaves. long question​. Its main functions are photosynthesis and gas exchange. Answer: Bract is a reduced leaf-like structure found at the base of the pedicel of a flower. Photosynthesis is the process of absorbing energy from sunlight and using it to produce food in the form of sugars. Both petioles and phyllodes can develop the ability to photosynthesize and function as foliage. Bars, 100 μm. Reticulate venation. Leaves attached via a petiole are called ‘petiolate’, leaves which attach directly are called ’sessile’. The axillary bud later develops into a branch. Posted at 02:39h in Uncategorized by 0 Comments. 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. Purple color, xylem; blue color, phloem. The blade is protected by a waxy layer on the top part of the epidermis called the cuticle. Petiole [C]. Leaf base: The part of the leaf with which it is attached to the stem is called the leaf base. Pulvinous: Answer: Option A Is the flattened, green, expanded portion of a 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. function of a leaf. They are the most important vegetative organs for photosynthesis. the outside layer of a leaf is called the epidermis tissue. It is a green, thin, flattened and expanded part of leaf with veins and veinlets traversing through its surface. (iv) It is exogenous in originand develops from the swollen leaf primordium of the growing apex. I: Simple Leaf – A life with undivided lamina is known as simple leaf. Veins. It develops at the node and bears a bud in its axil. The Dorsoventrally flattened part of Leaf is called Leaf Lamina Or Leaf Blade. All rights reserved. midrib . It bears lateral roots of several orders that are referred to as secondary, tertiary, etc. 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. This site is using cookies under cookie policy. 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. Parallel. Inside the blade the following parts can be distinguished: – The veins: are a like wrinkles or pipes running along the blade. Cite some other examples of modifications of plant parts … © copyright 2020 QS Study. Leaves originate from shoot apical meristems and are arranged in an acropetal order. The Leaf-Base: It is by no means a conspi­cuous part of the leaf. These green chloroplasts reside on the leaf's interior. The leaf is attached to the stem by the leaf base and may bear two lateral small leaves like structures called stipules. Some leaves like those of the pea, sensitive plant, mango have swollen leaf-bases. The Development of Kranz Anatomy can be considered in three Distinct Stages The initiation of procambium. In majority of the dicotyledonous plants, the direct elongation of the radicle leads to the formation of primary root which grows inside the soil. this layer is like the top layer of your skin. The leaf is a lateral, generally flattened structure borne on the stem. Leaf. Botanically, leaves are an integral part of the stem system. The lamina or the leaf blade is the green expanded part of the leaf with veins and veinlets. In banana, the so-called stem consists of the leaf sheaths. Leaf Leaves are green, thin flattened lateral outgrowths of the stem. a. red rot of sugarcane. Leaf Structure And Function Lab. Answer: Staminode is a sterile stamen, that does not produce pollen grains. e.g. The blade or lamina is the broad flat part of the leaf where photosynthesis occurs. Long thin flexible petioles allow leaf blades to flutter in wind, thereby cooling the leaf and bringing fresh air to leaf surface. Types of leaf: Leaves are of two types. 12 Jan. function 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. A leaf is an above-ground plant organ and it is green. tissues are layers of similar cells. A thin, flat part of the leaf that extends off the end of the petiole. The green leaves of the plant are collectively called as foliage of the plant. Leaves are the chief organs of photosynthesis. please mark me as braillist answer c SEM micrographs of leaf vasculatures of the species as shown in (a) with the same number. part not facing the sun. Blades differ in the types of edges, the patterns of the veins and the number of blades per leaf. is the most prominent vein running from base to apex and present in the middle of leaf blade. tip of the leaf. the epidermis is made of flat cells. 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. The lamina or the leaf blade is the green expanded part of the leaf with veins and veinlets. Petiole-The petiole help hold the blade to light. In most of the leaves there is a distinct line that runs through the lamina from lamina base to apex, which is called the midrib. Leaf-blade or Lamina It is the thin, flat part of the leaf that is typically green in color. 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. i hope it is helpful to you dear friend . (vi) The leaves do not possess any apical bud or a regular growing point. Such a leaf- base is called pulvinus (Fig. There is, usually, a middle prominent vein, which is known as the midrib. (vii) A leaf has three main parts – Leaf base, petiole and leaf lamina. The green expanded part of leaf is called as: [A]. Question 15. c.ergot of ba Many plants have a part called a petiole that attaches the leaf to the stem. The shape, margin, apex, surface and extent of incision of lamina varies in different leaves. Blade (Lamina) - green expanded portion of leaf - part that carries on the principal functions, photosynthesis, transpiration, and respiration. The leaf lamina is the green expanded part of the leaf with veins and veinlets. In most plants, leaves are generally flattened. Bars, 100 μm. Exchange. The Dorsoventrally flattened part of Leaf is called Leaf Lamina Or Leaf Blade. Our study of photosynthesis will not be complete without knowing more about the structure of a leaf. Full size image. Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials. The surface of the leaf that can be touched is actually the epidermis, which protects the processes occurring beneath. Atypical leaf consists of three main parts: leafbase, petiole and lamina (Figure: a). 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. Long thin flexible petioles allow leaf blades to flutter in wind, thereby cooling the leaf and bringing fresh air to leaf surface. 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. roots. What is a bract? The leaves and stem together form the shoot. Central/Ventral. Part # 1. Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials. Primary function of stomata is. You can specify conditions of storing and accessing cookies in your browser, The green expanded and flattened part of leag is called ------------​, which of the following is/are seed borne disease of crop? Main stems like branches and flower stalks (known as rachis) can also become phyllodes. This is the stalk which may attach the leaf to the stem; some leaves attach directly and don’t have petioles. The blade is usually green in colour for the presence of chlorophyll. Leaf base-The leaf is attached to the stem by the leaf base and may bear two lateral small leaf like structures called stipules. There is, usually, a middle prominent vein, which is known as the midrib. 62, a). part facing the sun. (i) The leaf is a lateral dissimilar appendage of the stem. 2. Explanation: The leaf blade is the expanded portion of a leaf. Parts of a Leaf The three main parts of a typical leaf Leaf blade or lamina [B]. Palisade and spongy mesophyll. A leaf consists of three parts— leaf base, petiole and lamina. The ‘flat portion’ of the leaf is called the leaf blade or lamina or epipodium. Apex. is arrangement of veins and veinlets in the lamina . Monocot leaves have which of the following venation patterns. It is green as it contains chlorophyll which is necessary in making the plant's food. Leaf morphology Typically, a leaf consists of a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole. - thin flattened, lateral outgrowth of the stem with green color but some are brightly colored - food making organ of the plant . 1. Margin. Question 14. The flattened part of a leaf is called the blade (Figure 50-1). provide support and conduct water, minerals and prepared food. Green color, palisade tissue; red arrow, the direction of cell arrangement. In monocotyledons, the leaf base expands into a sheath covering the stein partially or wholly. Mostly it is green in colour due to the presence of chlorophyll (a type of pigment present in Chloroplasts). b. bacterial blight of rice. Lamina. May this ANSWER will help you plz mark has brainliest. …, 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. In Opuntia the stem is modified into a flattened green structure to perform the function of leaves (i.e., photosynthesis). Epidermis – The leaf's outer layer and protective "skin" surrounding leaf tissues. Most leaves have stomata, which open and close.They regulate carbon dioxide, oxygen, and water vapour exchange with the atmosphere. A leaf is the green, flat lateral outgrowth in plants. Dorsal. Leaf is a green expanded exogenous lateral outgrowth which arises from the node of a stem or its branches. Different types of blade. The flattened leaves have a large surface area for sun exposure. In some leguminous plants the leatbase may become swollen, which is called the pulvinus. In monocotyledonous plants, the leaf base is expanded to a sheath which completely or partially covers the stem. The lamina or the leaf blade is the green expanded part of the leaf with veins and veinlets. It is the most important part of a leaf as it bears the stomata which helps in the passage of air. It is the most conspicuous part, what most of people identify and understand as a leaf when such a noun is mentioned. Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials. Question 13. There is, usually, a middle prominent vein, which is known as the midrib. The petiole help hold the blade to light. 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Large surface area for sun exposure undivided lamina is the expanded portion of a leaf the portion! Possess any apical bud or a regular growing point to a sheath the.