It develops laterally at the node. When more than two leaves develop at the nodes to form a whorl of leaves, it is called whorled phyllotaxy. Some are modified into tendrils to provide support to the plant. Each leaf typically has a leaf blade called the lamina, which is also the widest part of the leaf. Simple leaf and compound leaf are two types of leaves that occur in dicots. The two types of compound leaf are: 1. 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Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. The arrangement of veins in the leaf blade or lamina is called venation. The point at which the petiole attaches to the stem is called the leaf axil. Leaves can be modified in the form of spines that reduce water loss and also act as a defence. Leaf morphology. They convert carbon dioxide, water, and UV light into glucose through the process of photosynthesis. These shapes range from oval, elliptical and linear, to truncate and lanceolate. blades are slightly broader, e.g. [ "article:topic", "authorname:boundless", "showtoc:no" ], https://bio.libretexts.org/@app/auth/2/login?returnto=https%3A%2F%2Fbio.libretexts.org%2FBookshelves%2FIntroductory_and_General_Biology%2FBook%253A_General_Biology_(Boundless)%2F30%253A_Plant_Form_and_Physiology%2F30.4%253A_Leaves%2F30.4B%253A__Types_of_Leaf_Forms, 30.4C: Leaf Structure, Function, and Adaptation, Differentiate among the types of leaf forms. (vii) A leaf has three main parts – Leaf base, petiole and leaf lamina. Eg., Silk cotton. Each leaflet is attached to the rachis (middle vein), but may have its own stalk. Botanists and foresters have developed terms for the patterns and shapes used in tree identification. Eg., Neem. Legal. Leaf Form. They also reduce water loss due to transpiration. They protect the auxiliary bud present in their axil. The leaf blade is the broad portion of the leaf attached to the petiole, which attaches the leaf to the stem. Some leaves are attached to the plant stem by a petiole. For eg., in Opuntia, the leaves are modified into spines. in many grasses, Polyanthes tuberosa (Amaryllidaceae) etc. Compound Leaf. This occurs by the opening of stomata present in the leaves. In general, leaves are thin, flat organs responsible for the photosynthesis of the plant.Although photosynthesis typically only occurs on the upper surface of the leaf, it can occur on both sides in some plant species. For example, tendrils of peas, spines of cacti, onion bulb, leaves of insectivorous plants, etc. 1. Leaf location 47. Biology Morphology of Flowering Plants part 13 (Leaf: parts-lamina, Petiole, Stipule) CBSE class 11 XI The three components of a leaf are the leaf blade or lamina, petiole, and stipule. Required fields are marked *. The structure of a leaf is described below in detail : Generally, leaf base, petiole, and lamina, together form the main parts of a  leaf. Bipinnately compound (or double compound) leaves are twice divided; the leaflets are arranged along a secondary vein, which is one of several veins branching off the middle vein. leaf is a green expanded exogenous lateral outgrowth which arises from the node of a stem or its branches. Why are leaves a major part of the plant? Morphology is the study of science that deals with the form and structure of an organism. In simple leaves, the lamina is continuous. For eg., Opuntia. Venation is the arrangement of veins and veinlets on the lamina or surface of the leaf. Shape of Leaf Lamina: Linear: Long and narrow leaf, e.g., many grasses. Missed the LibreFest? Pinnately compound leaves Leaf Its Characteristics Functions Types Of Venation Vein Density As A Function Of Lamina Position For Leaves Growing At The Scientific Diagram Leaf Definition. In simple leaves, the lamina is continuous. Simple – A life with undivided lamina is known as simple leaf. Leaves are found at the nodes of the stem and contain the photosynthetic pigment chlorophyll. (commonly called “umbrella plant”). When only a single leaf develops at each node alternatively, it is an alternate type of phyllotaxy.E.g. An example of this type is the maple leaf. They are commonly fixed by carpenters over plywood and MDF while making the furniture. Leaves are collectively referred to as foliage, as in "autumn foliage". (ii) A leaf is always borne at the node of stem. Therefore, they store water and nutrients. In addition, they also have other significant roles to play, such as support, storage of food, defence, etc. The leaves get modified into thread-like structures called tendrils. A compound leaf is a leaf made up of two or more leaflets. These are thin, membranous structures, without stalks, brownish or colourless in appearance. Radical present near the roots 2. A structurally complete leaf of an angiosperm consists of a petiole (leaf stem), a lamina (leaf blade), and stipules (small processes located to either side of the base of the petiole). It may be a part of a larger structure. Cuneate Type: They are wedge-shaped. Different plants show different types of venation. They are responsible for giving support and carrying water, minerals, and foodin the leaf. These can be differentiated into: In a pinnately compound leaf, the midrib of the leaf is divided into numerous leaflets and all connected by a common axis. R e t i c u l a t e Venation: This type of venation is … Elliptical: An ellipse-shaped leaf, e.g., guava, jack, etc. Spatulate Type: They have shapes resembling spatulas or spoons. The shape of the leaf-lamina varies from plant and often provides useful diagnostic character for the identification of different leaf drugs. Types of Leaf Forms. Removal of excess water from the xylem at the edges of the leaves when the stomata are closed is known as guttation. The compound leaves are further sub-divided into the following types of leaves: In a palmately compound leaf, the leaflets are attached at the tip of the petiole. Compound leaves are a characteristic of some families of higher plants. Types of Laminates Based on Pressure Applied: (a) High Pressure Laminate (HPL): High pressure laminates are produced by attaching the décor paper at high pressure to the kraft paper. Guava plants. The leaf shape may also be formed of lobes where the gaps between lobes do not reach to the main vein. In a pinnately compound leaf, the middle vein is called the midrib. ‘ A few plants have their leaves modified into needle-like structures known as spines. For eg., Australian Acacia. A compound leaf is a leaf made up of two or more leaflets. What are the different shapes of the leaves? The pinnules on one secondary vein are called “pinna”. The upper leaflets of Pisum sativum get modified into tendrils. Besides, they also help in the exchange of gases by the opening and closing of stomata and removes excess water from the plant by the process of transpiration. These tendrils climb a nearby stick or wall and provide support to the plant. Every life on the earth is directly or indirectly dependent on plants. The small bud-like structures at the base of the leaf are the stipules. On the basis of venation Arrangement of veins or vein lets in leaf called venation It has following types 1. types of leaf based on leaf lamina. Leaves of different plants have different shapes and sizes, but all of them have same basic structure. (i) Identify the plant which has compound leaves: (a) Banana (b) Banyan (c) Mango (d) Rose Answer Rose (ii) Which one of the following is not an insectivorous plant— (a) Pitcher plant (b) Venus flytrap (c) Bladderwort (d) Cactus Answer Cactus (iii) This leaf shows parallel venation: (a) Banana (b) Mango (c) Banyan (d) Guava Answer Banana (iv) The point on the stem from where the leaf arises is: (a) Petiole (b) Lamina (c) Node (d) Trunk Answer Node (v) Which one of the following is essential for photosynthesis: … For more information on Morphology of Leaves, different types of leaves, parts of a leaf, its modifications, structure and functions, keep visiting BYJU’S website or download BYJU’S app for further reference. Pinnately-compound leaves have their leaflets arranged along the middle vein. Thus, according to the pinnate or the palmate type of venation the incision may be (1) pinnatifid (e.g., poppy or chrysanthemum leaf); (2) pinnatipartite (e.g., Argemone mexicana); (3) pinnatisect (e.g., marigold, date palm, coconut, Ipomoea quamoclit); (4) palmatifid (passion flower or cotton leaf); (5) palmatipartite (castor or papaw leaf) and (6) palmatisect (Ipomoea pulchella or … In a simple leaf, such as the banana leaf, the blade is completely undivided. The LibreTexts libraries are Powered by MindTouch® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. Some leaves are thick that help in water storage. Leaf margins-The shape of the margin of leaf lamina or leaf blade is dependent on the extent to which the leaf blades are subject to varieties of incisions, cuts or irregularities or completely free from them. In such plants, the leaves are modified to catch and digest insects. Lyrate Type: They are in the shape of a lyre. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. Let’s learn more about the morphology of leaves, parts of a leaf, different types of leaves and their modifications. Scale leaves in onion are fleshy and thick and store food and water. Each leaflet is called a “pinnule”. Ovate: Leaves produced are progressively shorter, narrow, and brittle in texture; these bunch together at the top and hence provide the name of … Plants show three types of phyllotaxy- alternate, opposite and whorled types of phyllotaxy. Leaves may be simple or compound. For each of these functions, they have been modified into different forms. Leaves are a site of photosynthesis. In a compound leaf, the midrib of the leaf is branched into different leaflets and is connected by a single petiole. They convert carbon dioxide, water and sunlight into glucose and energy. Eg., Salvinia. Oblique Type: The lamina of this leaf has unequal halves. They also help to transport water and food to different parts of the plant. Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials. Venation is defined as the arrangement of veins and the veinlets in the leaves. The leaflets do not contain axillary buds. are different modified leaves. This type o… The patterns of arrangement of leaves on the stem are called Phyllotaxy. The two different types of leaves found in a plant are: When a single lamina is connected to the main stem by a petiole, the leaf is said to be simple. Veins are vascular bundles present on the leaf. The other types of leaves include acicular, linear, lanceolate, orbicular, elliptical, oblique, centric cordate, etc. A typical plant leaf (Different parts and types) November 15, 2019 Sushil Humagain 0. The leaflets of palmately-compound leaves radiate outwards from the end of the petiole. In a few plants, one of the leaves present at the nodes gets modified into adventitious roots which helps them to float over the water surface. Eg., Bignonia unguiscati. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. Pinnately compound leaves 2. In leaf: Leaf morphology …a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole. Not every species produces leaves with all of these structural parts. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. ... Chapter 5 Morphology Of Flowering Plants Parts Functions Venation Phyllotaxy And Types Leaf Notes Study Score Learn About Leaves Science For Kids (v) The growth of leaf is limited. Some tree species make things more interesting by displaying more than one type of leaf … Parallel –the veins are all arranged parallel to each other and each vein doesn’t join any other vein. Your email address will not be published. Few of the modifications are mentioned below: The leaves perform the following functions: Photosynthesis is the primary function of leaves. Typically, a leaf consists of a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole.In angiosperms leaves commonly have a pair of structures known as stipules, which are located on each side of the leaf base and may resemble scales, spines, glands, or … The two different types of leaves found in a plant are: Simple Leaf. This is known as phyllode. (iv) It is exogenous in originand develops from the swollen leaf primordium of the growing apex. We know leaves are specialised to perform photosynthesis. A simple leaf may be incised to any depth but not down to the midrib or petiole. For eg., Pea, palm leaves. Simple leaves are lobed or divided but do not form distinct leaflets. The succulent and thick leaves particularly adapt to water storage. What are the different types of blade of a leaf? There are two different types of leaves – simple and compound leaves. Compound leaf: Here the lamina is divided in to a number of leaf like lobes called the leaflets. E.g. Leaves are thin, flat organs responsible for photosynthesis in the plants. Pinnately compound leaves take their name from their feather-like appearance; the leaflets are arranged along the middle vein, as in rose leaves or the leaves of hickory, pecan, ash, or walnut trees. Cauline leaves arise from main stem only 3. High pressure laminates are extremely durable and can take heavy loads. These can be further differentiated into: Palmately compound leaf & Pinnately compound leaf. In some plants, the terminal leaflets of leaf get modified into hook-like structures that help them in climbing. Morphology of leaves deals with the study of the structural features and parts of a leaf. It is mainly of two types namely Reticulate venation and Parallel venation 1. The parenchymatous cells of these leaves have large vacuoles filled with hydrophilic colloid. Leaves may be simple or compound. Round or orbicular: Leaf with a circular leaf blade, e.g., lotus, garden nasturtium, etc. Transpiration is the removal of excess water from the plants into the atmosphere. The spines act as defensive structures. A palmately compound leaf has its leaflets radiating outwards from the end of the petiole, like fingers off the palm of a hand. Eg., Guava leaves. A simple leaf may be incised to any depth but not down to the midrib or petiole. Examples of plants with palmately compound leaves include poison ivy, the buckeye tree, or the familiar house plant Schefflera sp. Ramal arise from main stem and breaches 46. Fig. (B) Linear-When the leaf blade is long, narrow and flat i.e. ... 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