Biology Morphology of Flowering Plants part 13 (Leaf: parts-lamina, Petiole, Stipule) CBSE class 11 XI The leaflets are borne on a common axis and they do not bear any axillary buds in their axils. For eg., Opuntia. Lanceolate: Lance-shaped leaf, e.g., bamboo, Nerium, etc. In simple leaves, the lamina is continuous. Thank You! What are the different types of blade of a leaf? Compound leaf: Here the lamina is divided in to a number of leaf like lobes called the leaflets. types of leaf based on leaf lamina. A leaf diagram representing the parts of a leaf. They convert carbon dioxide, water, and UV light into glucose through the process of photosynthesis. Leaves may be simple or compound. Some tree species make things more interesting by displaying more than one type of leaf … Pinnately compound leaves There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. [ "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. The leaf is a flattened lateral out-growth of the stem/ branch and bears a … 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. The leaflets of palmately-compound leaves radiate outwards from the end of the petiole. Therefore, they store water and nutrients. Ovate Type: They are oval or egg-shaped in their structure. The upper leaflets of Pisum sativum get modified into tendrils. Xylem transports water from the roots to the leaves whereas phloem transports food through the leaf to rest of the plant. There is no branching among the veins. When a pair of leaves develops at each node opposite to each other, it is called opposite phyllotaxy.E.g. The silk tree (Albizia) is an example of a plant with bipinnate leaves. 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). Veins are vascular bundles present on the leaf. Legal. For eg., Pea, palm leaves. The patterns of arrangement of leaves on the stem are called Phyllotaxy. A simple leaf may be incised to any depth but not down to the midrib or petiole. Cuneate Type: They are wedge-shaped. What is a lamina or leaf blade quora leaf lamina shape variation among lamina surface area wild foraging give names step three. There are three main parts of a leaf – Leaf base, leaf lamina, and petiole. Alstonia. Some are modified into tendrils to provide support to the plant. Leaves are found at the nodes of the stem and contain the photosynthetic pigment chlorophyll. Missed the LibreFest? Leaves are a site of photosynthesis. Let’s learn more about the morphology of leaves, parts of a leaf, different types of leaves and their modifications. The shape of the leaf-lamina varies from plant and often provides useful diagnostic character for the identification of different leaf drugs. In addition, they also have other significant roles to play, such as support, storage of food, defence, etc. Pinnately-compound leaves have their leaflets arranged along the middle vein. In some plants, the petiole becomes flattened, taking the shape of a leaf and turns green in colour. Centric Type: They are cylindrical and hollow. Photosynthesis is the major function performed by leaves. E.g. The succulent and thick leaves particularly adapt to water storage. They are commonly fixed by carpenters over plywood and MDF while making the furniture. The small bud-like structures at the base of the leaf are the stipules. (iii) Generally there is always an axillary budin the axil of a leaf. Venation is the arrangement of veins and veinlets on the lamina or surface of the leaf. Botanists and foresters have developed terms for the patterns and shapes used in tree identification. Leaf anatomy. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. The two types of compound leaf are: 1. Guava plants. Watch the recordings here on Youtube! (vii) A leaf has three main parts – Leaf base, petiole and leaf lamina. For example, tendrils of peas, spines of cacti, onion bulb, leaves of insectivorous plants, etc. Each leaflet is called a “pinnule”. High pressure laminates are extremely durable and can take heavy loads. 18: Shape of the leaf. The leaf shape may also be formed of lobes where the gaps between lobes do not reach to the main vein. In a simple leaf, such as the banana leaf, the blade is completely undivided. ‘ 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. The following types of leaf margin are recognised : l. Types of leaf - Leaves are of two types. Palmately compound leaves. Eg., Silk cotton. Compound leaves: The lamina is dissected upto midrib or upto tip of the petiole to form many leaflets. Some are modified to catch and digest insects. Every life on the earth is directly or indirectly dependent on plants. In a compound leaf, the leaf blade is divided, forming leaflets that are attached to the middle vein, but have their own stalks. For eg., in Opuntia, the leaves are modified into spines. The pinnules on one secondary vein are called “pinna”. It develops laterally at the node. 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. When a single lamina is connected to the main stem by a petiole, the leaf is said to be simple. Leaf morphology. Required fields are marked *. Ramal arise from main stem and breaches 46. 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 … 1. Cuneate bases are sharp-pointed, with an angle less than 45 degrees between opposite sides which form a wedge or triangular shape that tapers to a narrow region at the point of attachment of lamina with petiole. in many grasses, Polyanthes tuberosa (Amaryllidaceae) etc. Casuarina and Asparagus also contain sale leaves. Eg., Guava leaves. (a) The banana plant (Musa sp.) They also reduce water loss due to transpiration. The leaflets do not contain axillary buds. Why are leaves a major part of the plant? Leaf Its Characteristics Functions Types Of Venation Vein Density As A Function Of Lamina Position For Leaves Growing At The Scientific Diagram Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials. Veins can be observed as lines running on the surface of the leaf. These can be further differentiated into: Palmately compound leaf & Pinnately compound leaf. Leaves are thin, flat organs responsible for photosynthesis in the plants. Fig. The parenchymatous cells of these leaves have large vacuoles filled with hydrophilic colloid. Leaves can be modified in the form of spines that reduce water loss and also act as a defence. The spines act as defensive structures. Some leaves are thick that help in water storage. The leaf is a thin, broad, flat and green part of a plant which is attached to the stem or branch. New leaves emerging from the infected plants are narrower with wavy leaf lamina and yellow leaf margins (Nelson, 2004). They perform the function of photosynthesis and help in the removal of excess water from the aerial parts of the plant. 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 leaflike structures. Simple leaf with pinnately lobed lamina is found in Brassica. Leaf Definition. Round or orbicular: Leaf with a circular leaf blade, e.g., lotus, garden nasturtium, etc. Each leaflet is attached to the rachis (middle vein), but may have its own stalk. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. There are various types of leaves, each with its own shapes. 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