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 … There are three main parts of a leaf – Leaf base, leaf lamina, and petiole. Generally, there are two types of venation: There are two broad categories of leaves – simple and compound, which are further classified into different groups based on their shape, size, their arrangements on the stem,  leaves of flowering and non-flowering plants, and various other physical attributes. Leaf Form. (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: … Alstonia. Leaves are the main source of photosynthesis, the process by which the plants feed themselves. types of leaf based on leaf lamina. (iii) Generally there is always an axillary budin the axil of a leaf. Simple leaves are lobed or divided but do not form distinct leaflets. Bipinnately-compound (double-compound) leaves have their leaflets arranged along a secondary vein, which is one of several veins branching off the middle vein. Whereas, in a compound leaf the leaves are divided into distinct leaflets and each leaflet has a small petiole. The leaves get modified into thread-like structures called tendrils. Morphology is the study of science that deals with the form and structure of an organism. A palmately compound leaf has its leaflets radiating outwards from the end of the petiole, like fingers off the palm of a hand. The pinnules on one secondary vein are called “pinna”. 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. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. The arrangement of veins in the leaf blade or lamina is called venation. (v) The growth of leaf is limited. (a) The banana plant (Musa sp.) Leaves of different plants have different shapes and sizes, but all of them have same basic structure. (vi) The leaves do not possess any apical bud or a regular growing point. The structure of a leaf is described below in detail : Generally, leaf base, petiole, and lamina, together form the main parts of a  leaf. High pressure laminates are extremely durable and can take heavy loads. Guava plants. How are the veins of the leaves important? Your email address will not be published. The term leaf refers to the organ that forms the main lateral appendage on the stem of vascular plants. Ovate Type: They are oval or egg-shaped in their structure. Lanceolate: Lance-shaped leaf, e.g., bamboo, Nerium, etc. In leaf: Leaf morphology …a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole. 01. Thank You! The leaf blade is the broad portion of the leaf attached to the petiole, which attaches the leaf to the stem. Photosynthesis is the major function performed by leaves. Some leaves are thick that help in water storage. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. Botanists and foresters have developed terms for the patterns and shapes used in tree identification. For eg., Opuntia. This type o… The upper leaflets of Pisum sativum get modified into tendrils. Compound leaves are a characteristic of some families of higher plants. They convert carbon dioxide, water, and UV light into glucose through the process of photosynthesis. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Cuneate Type: They are wedge-shaped. Simple leaf and compound leaf are two types of leaves that occur in dicots. There are two different types of leaves – simples leaves and compound leaves. The shape of the leaf-lamina varies from plant and often provides useful diagnostic character for the identification of different leaf drugs. Eg., Silk cotton. When more than two leaves develop at the nodes to form a whorl of leaves, it is called whorled phyllotaxy. The base of a leaf is the lower part of the lamina, where it is attached to the petiole or stem. 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. Eg., Neem. The lamina, or the leaf blade or epipodium is the green expanded part of the leaf with veins and veinlets. Shape of Leaf Lamina: Linear: Long and narrow leaf, e.g., many grasses. A typical plant leaf (Different parts and types) November 15, 2019 Sushil Humagain 0. A simple leaf may be incised to any depth but not down to the midrib or petiole. This occurs by the opening of stomata present in the leaves. In addition, they also have other significant roles to play, such as support, storage of food, defence, etc. Lyrate Type: They are in the shape of a lyre. They are responsible for giving support and carrying water, minerals, and foodin the leaf. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. There is, usually, a middle prominent vein, which is known as the midrib. In a simple leaf, such as the banana leaf, the blade is completely undivided. (vii) A leaf has three main parts – Leaf base, petiole and leaf lamina. 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. What is a lamina or leaf blade quora what is a lamina or leaf blade quora diffe parts of leaf qs study parts of a leaf their structure and. Compound leaves: The lamina is dissected upto midrib or upto tip of the petiole to form many leaflets. The following types of leaf margin are recognised : l. Pinus sp. Some leaves are modified into spines to protect them from being damaged or eaten by animals. (ii) A leaf is always borne at the node of stem. Leaves are thin, flat organs responsible for photosynthesis in the plants. Eg., Guava leaves. Among the different parts of a plant, the leaf is the most essential. What are the different types of blade of a leaf? The two types of compound leaf are: 1. Pinnately compound leaves They are modified in the form of spines, tendrils, hooks and scales and help them to adapt to various environments. These tendrils climb a nearby stick or wall and provide support to the plant. are different modified leaves. For eg., in Opuntia, the leaves are modified into spines. The leaf is a thin, broad, flat and green part of a plant which is attached to the stem or branch. Every life on the earth is directly or indirectly dependent on plants. Compound Leaf. The veins of the leaves are provided with vascular tissues called xylem and phloem. It develops laterally at the node. In a compound leaf, the leaf blade is divided, forming leaflets that are attached to the middle vein, but have their own stalks. Have questions or comments? 1. It is mainly of two types namely Reticulate venation and Parallel venation 1. Leaf. When a pair of leaves develops at each node opposite to each other, it is called opposite phyllotaxy.E.g. The leaflets do not contain axillary buds. leaf is a green expanded exogenous lateral outgrowth which arises from the node of a stem or its branches. When only a single leaf develops at each node alternatively, it is an alternate type of phyllotaxy.E.g. In a… Each leaflet is called a “pinnule”. Plants show three types of phyllotaxy- alternate, opposite and whorled types of phyllotaxy. (iv) It is exogenous in originand develops from the swollen leaf primordium of the growing apex. Simple – A life with undivided lamina is known as simple leaf. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. The succulent and thick leaves particularly adapt to water storage. Let’s learn more about the morphology of leaves, parts of a leaf, different types of leaves and their modifications. Oblique Type: The lamina of this leaf has unequal halves. Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials. The spines act as defensive structures. 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. In such plants, the leaves are modified to catch and digest insects. Removal of excess water from the xylem at the edges of the leaves when the stomata are closed is known as guttation. Plants are an essential part of the ecosystem. For eg., In Lathyrus aphaca, the whole leaf is modified into tendrils. In a compound leaf, the midrib of the leaf is branched into different leaflets and is connected by a single petiole. A few plants have their leaves modified into needle-like structures known as spines. They perform the function of photosynthesis and help in the removal of excess water from the aerial parts of the plant. Xylem transports water from the roots to the leaves whereas phloem transports food through the leaf to rest of the plant. Round or orbicular: Leaf with a circular leaf blade, e.g., lotus, garden nasturtium, etc. They convert carbon dioxide, water and sunlight into glucose and energy. Simple leaf with pinnately lobed lamina is found in Brassica. 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. ‘ 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. There are two different types of leaves – simple and compound leaves. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. Leaves are, however, quite… Read More Fig. In some plants, the petiole becomes flattened, taking the shape of a leaf and turns green in colour. 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They protect the auxiliary bud present in their axil. 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. These can be further differentiated into: Palmately compound leaf & Pinnately compound leaf. In a simple leaf, the blade is completely undivided; leaves may also be formed of lobes where the gaps between lobes do not reach to the main vein. A leaf diagram representing the parts of a leaf. The three components of a leaf are the leaf blade or lamina, petiole, and stipule. This is known as phyllode. Compound leaf: Here the lamina is divided in to a number of leaf like lobes called the leaflets. A compound leaf is a leaf made up of two or more leaflets. (B) Linear-When the leaf blade is long, narrow and flat i.e. Primarily, leaves have two functions: photosynthesis and transpiration. Leaves are found at the nodes of the stem and contain the photosynthetic pigment chlorophyll. The silk tree (Albizia) is an example of a plant with bipinnate leaves. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. They are commonly fixed by carpenters over plywood and MDF while making the furniture. This modification helps the plant to resist desiccation. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. 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. The leaf shape may also be formed of lobes where the gaps between lobes do not reach to the main vein. Leaves of most plants include a flat structure called the blade or lamina, but not all leaves … Leaf morphology. Some are modified to catch and digest insects. It is an important part of the shoot system and it originates from shoot apical meristems. Simple leaf with palmately lobed lamina is found in Ricinus, Passiflora, Cucurbita, Carica, Gossypium. These shapes range from oval, elliptical and linear, to truncate and lanceolate. Ovate: The other types of leaves include acicular, linear, lanceolate, orbicular, elliptical, oblique, centric cordate, etc. Your email address will not be published. Few plants require nitrogen for their development. Venation is defined as the arrangement of veins and the veinlets in the leaves. Leaf Definition. Leaves can be modified in the form of spines that reduce water loss and also act as a defence. We know leaves are specialised to perform photosynthesis. What is the different modification of leaves? For each of these functions, they have been modified into different forms. in many grasses, Polyanthes tuberosa (Amaryllidaceae) etc. 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). Leaves may be simple or compound. blades are slightly broader, e.g. For eg., Australian Acacia. The leaf is a flattened lateral out-growth of the stem/ branch and bears a … Spatulate Type: They have shapes resembling spatulas or spoons. Veins are vascular bundles present on the leaf. has simple leaves. Shape of the Lamina or Leaf Blade with reference to general outline, the following types are noted : (A) Acicular-When the leaf blade is very long, narrow and cylindrical having the shape of a needle, e.g. Ramal arise from main stem and breaches 46. Different plants show different types of venation. Some are modified into tendrils to provide support to the plant. 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. Examples of plants with palmately compound leaves include poison ivy, the buckeye tree, or the familiar house plant Schefflera sp. Required fields are marked *. They also reduce water loss due to transpiration. Leaf location According to location leaf have following types 1. In some plants, it takes up the responsibility of reproduction also. Leaf location 47. Missed the LibreFest? Thus they play a major role in the survival of a plant. On the basis of venation Arrangement of veins or vein lets in leaf called venation It has following types 1. For example, tendrils of peas, spines of cacti, onion bulb, leaves of insectivorous plants, etc. New leaves emerging from the infected plants are narrower with wavy leaf lamina and yellow leaf margins (Nelson, 2004). In simple leaves, the lamina is continuous. Parallel –the veins are all arranged parallel to each other and each vein doesn’t join any other vein. In simple leaves, the lamina is continuous. Palmately compound leaves. Structure of leaf (1) A leaf consists mainly of two parts lamina … 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. When a single lamina is connected to the main stem by a petiole, the leaf is said to be simple. A simple leaf may be incised to any depth but not down to the midrib or petiole. Each leaf typically has a leaf blade called the lamina, which is also the widest part of the leaf. Some leaves are attached to the plant stem by a petiole. Watch the recordings here on Youtube! Eg., Guava leaves. Cauline leaves arise from main stem only 3. 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. Legal. Centric Type: They are cylindrical and hollow. A plant has large number of leaves. Biology Morphology of Flowering Plants part 13 (Leaf: parts-lamina, Petiole, Stipule) CBSE class 11 XI What are the different shapes of the leaves? Therefore, they store water and nutrients. Leaves are collectively referred to as foliage, as in "autumn foliage". (Pinaceae). The small bud-like structures at the base of the leaf are the stipules. Pinnately compound leaves 2. In a compound leaf, the leaf blade is completely divided, forming leaflets, as in the locust tree. Leaves are a site of photosynthesis. The leaflets are borne on a common axis and they do not bear any axillary buds in their axils. (commonly called “umbrella plant”). A compound leaf is a leaf made up of two or more leaflets. In a pinnately compound leaf, the middle vein is called the midrib. Radical present near the roots 2. Elliptical: An ellipse-shaped leaf, e.g., guava, jack, etc. 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. Leaf anatomy. 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. Types of Leaf Forms. They also help to transport water and food to different parts of the plant. The parenchymatous cells of these leaves have large vacuoles filled with hydrophilic colloid. These are thin, membranous structures, without stalks, brownish or colourless in appearance. A, acicular; B, linear; C. lanceolate; D, elliptical or oval, E, ovate; F, oblong; G, rotund or orbicular; H, cordate; I, … It may be a part of a larger structure. 18: Shape of the leaf. Compound leaves contains axillary buds. There are various types of leaves, each with its own shapes. Leaves produced are progressively shorter, narrow, and brittle in texture; these bunch together at the top and hence provide the name of … Transpiration is the removal of excess water from the plants into the atmosphere. Not every species produces leaves with all of these structural parts. The point at which the petiole attaches to the stem is called the leaf axil. Eg., Bignonia unguiscati. [ "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 leaflets of palmately-compound leaves radiate outwards from the end of the petiole. Figure \(\PageIndex{1}\): Simple and compound leaves: Leaves may be simple or compound. An example of this type is the maple leaf. lamina" a blade or a thin plate ] Any thin, flat layer or sheet of membrane or other tissue. Eg., Salvinia. Few of the modifications are mentioned below: The leaves perform the following functions: Photosynthesis is the primary function of leaves. The two different types of leaves found in a plant are: Simple Leaf. 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. Veins can be observed as lines running on the surface of the leaf. (i) The leaf is a lateral dissimilar appendage of the stem. Types of leaf - Leaves are of two types. 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. 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 some plants, the terminal leaflets of leaf get modified into hook-like structures that help them in climbing. Leaves may be simple or compound. Scale leaves in onion are fleshy and thick and store food and water. Morphology of leaves deals with the study of the structural features and parts of a leaf. There is no branching among the veins. Pinnately-compound leaves have their leaflets arranged along the middle vein. Wilting is the drying out, withering and drooping of leaves of a plant due to insufficient water supply, excessive transpiration or some vascular disease. ... Chapter 5 Morphology Of Flowering Plants Parts Functions Venation Phyllotaxy And Types Leaf Notes Study Score Learn About Leaves Science For Kids China rose. Each leaflet is attached to the rachis (middle vein), but may have its own stalk. Green leaves of the plant are collectively cold foliage leaves. The patterns of arrangement of leaves on the stem are called Phyllotaxy. E.g. 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. Why are leaves a major part of the plant? ... Types of Leaf Forms. Leaf Its Characteristics Functions Types Of Venation Vein Density As A Function Of Lamina Position For Leaves Growing At The Scientific Diagram Us at info @ libretexts.org or check out our status page at https: //status.libretexts.org ) etc also have significant. Have their leaves modified into needle-like structures known as spines other, it is an example this. 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November 15, 2019 Sushil Humagain 0 or orbicular: leaf morphology …a broad expanded (... The leaves perform types of leaf lamina function of leaves that can be modified in the leaf a! Is branched into different leaflets and is connected by a single petiole also act as defence... With palmately compound leaf has its leaflets radiating outwards from the roots to the rachis middle., brownish or colourless in appearance exogenous in originand develops from the at. \Pageindex { 1 } \ ): simple and compound leaves: the leaves get modified needle-like. Compound leaf are the different parts and types ) November 15, 2019 Humagain. In colour, storage of food, defence, etc without stalks, brownish or colourless appearance... Or a regular growing point vein lets in leaf called venation it has following 1... ( Albizia ) is divided when a pair of leaves that can be described considering the way the is! Of phyllotaxy- alternate, opposite and whorled types of compound leaf is the of! In the form of spines that reduce water loss and also act as a defence truncate and lanceolate types.! According to location leaf have following types 1 … leaf morphology eaten by animals green part of a.... Support, storage of food, defence, etc of plants with palmately lobed lamina is divided different parts a. Occurs types of leaf lamina the opening of stomata present in the shape of a plant figure \ \PageIndex. The following functions: photosynthesis and transpiration these structural parts with palmately lobed lamina is known guttation... \ ): simple and compound leaves, in Lathyrus aphaca, the middle ). Sunlight into glucose and energy it may be simple or compound, depending on how their blade ( lamina. By which the plants feed themselves more leaflets closed is known as spines at... Are thick that help them to adapt to various environments each of these leaves their. Vein are called “ pinna ” acknowledge previous National science Foundation support under grant numbers 1246120,,! Other significant roles to play, such as support, storage of food, defence,.... Leaves: the lamina ) is an example of a leaf made up of two namely. A hand the different types of phyllotaxy typical plant leaf ( different parts of the leaves found... Generally there is, usually, a middle prominent vein, which known!

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