(commonly called “umbrella plant”). The structure of a leaf is described below in detail : Generally, leaf base, petiole, and lamina, together form the main parts of a  leaf. Primarily, leaves have two functions: photosynthesis and transpiration. Plants are an essential part of the ecosystem. Xylem transports water from the roots to the leaves whereas phloem transports food through the leaf to rest of the plant. Leaves can be modified in the form of spines that reduce water loss and also act as a defence. Venation is defined as the arrangement of veins and the veinlets in the leaves. High pressure laminates are extremely durable and can take heavy loads. are different modified leaves. The base of a leaf is the lower part of the lamina, where it is attached to the petiole or stem. Have questions or comments? For example, tendrils of peas, spines of cacti, onion bulb, leaves of insectivorous plants, etc. Wilting is the drying out, withering and drooping of leaves of a plant due to insufficient water supply, excessive transpiration or some vascular disease. The pinnules on one secondary vein are called “pinna”. Compound leaves: The lamina is dissected upto midrib or upto tip of the petiole to form many leaflets. leaf is a green expanded exogenous lateral outgrowth which arises from the node of a stem or its branches. Round or orbicular: Leaf with a circular leaf blade, e.g., lotus, garden nasturtium, etc. The leaves get modified into thread-like structures called tendrils. Leaves may be simple or compound. ‘ Leaves produced are progressively shorter, narrow, and brittle in texture; these bunch together at the top and hence provide the name of … When a single lamina is connected to the main stem by a petiole, the leaf is said to be simple. In leaf: Leaf morphology …a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole. Whereas, in a compound leaf the leaves are divided into distinct leaflets and each leaflet has a small petiole. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. The small bud-like structures at the base of the leaf are the stipules. Leaf. Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials. has simple leaves. Photosynthesis is the major function performed by leaves. Centric Type: They are cylindrical and hollow. New leaves emerging from the infected plants are narrower with wavy leaf lamina and yellow leaf margins (Nelson, 2004). The patterns of arrangement of leaves on the stem are called Phyllotaxy. Leaf location According to location leaf have following types 1. Eg., Neem. Veins are vascular bundles present on the leaf. They also help to transport water and food to different parts of the plant. R e t i c u l a t e Venation: This type of venation is … There are three main parts of a leaf – Leaf base, leaf lamina, and petiole. Compound Leaf. Some are modified to catch and digest insects. Not every species produces leaves with all of these structural parts. A plant has large number of leaves. (Pinaceae). Leaves are found at the nodes of the stem and contain the photosynthetic pigment chlorophyll. A leaf diagram representing the parts of a leaf. For eg., Opuntia. On the basis of venation Arrangement of veins or vein lets in leaf called venation It has following types 1. Different plants show different types of venation. Thank You! 18: Shape of the leaf. 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. Leaf location 47. (B) Linear-When the leaf blade is long, narrow and flat i.e. Let us have a detailed look at some of the modification of leaves: The xerophytic plants and plants belonging to the Crassulaceae family have thick and succulent leaves that store water in their tissues. Simple leaf and compound leaf are two types of leaves that occur in dicots. (vii) A leaf has three main parts – Leaf base, petiole and leaf lamina. (vi) The leaves do not possess any apical bud or a regular growing point. Guava plants. Pinnately compound leaves Morphology of leaves deals with the study of the structural features and parts of a leaf. A simple leaf may be incised to any depth but not down to the midrib or petiole. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. The spines act as defensive structures. Spatulate Type: They have shapes resembling spatulas or spoons. Pinnately-compound leaves have their leaflets arranged along the middle vein. In some plants, the terminal leaflets of leaf get modified into hook-like structures that help them in climbing. Elliptical: An ellipse-shaped leaf, e.g., guava, jack, etc. What are the different types of blade of a leaf? Types of leaf - Leaves are of two types. 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. (a) The banana plant (Musa sp.) Let’s learn more about the morphology of leaves, parts of a leaf, different types of leaves and their modifications. Therefore, they store water and nutrients. 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. The leaf blade is the broad portion of the leaf attached to the petiole, which attaches the leaf to the stem. They are commonly fixed by carpenters over plywood and MDF while making the furniture. 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. Leaf Definition. The leaf is a flattened lateral out-growth of the stem/ branch and bears a … Plants show three types of phyllotaxy- alternate, opposite and whorled types of phyllotaxy. The point at which the petiole attaches to the stem is called the leaf axil. We know leaves are specialised to perform photosynthesis. Parallel –the veins are all arranged parallel to each other and each vein doesn’t join any other vein. Biology Morphology of Flowering Plants part 13 (Leaf: parts-lamina, Petiole, Stipule) CBSE class 11 XI Leaves are collectively referred to as foliage, as in "autumn foliage". Your email address will not be published. Oblique Type: The lamina of this leaf has unequal halves. The leaflets of palmately-compound leaves radiate outwards from the end of the petiole. Morphology is the study of science that deals with the form and structure of an organism. It develops laterally at the node. These tendrils climb a nearby stick or wall and provide support to the plant. Why are leaves a major part of the plant? In simple leaves, the lamina is continuous. 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). What is the different modification of leaves? 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