types of leaf lamina

The silk tree (Albizia) is an example of a plant with bipinnate leaves. Pinnately-compound leaves have their leaflets arranged along the middle vein. leaf is a green expanded exogenous lateral outgrowth which arises from the node of a stem or its branches. blades are slightly broader, e.g. 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. For each of these functions, they have been modified into different forms. What are the different types of blade of a leaf? A simple leaf may be incised to any depth but not down to the midrib or petiole. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. 18: Shape of the leaf. These tendrils climb a nearby stick or wall and provide support to the plant. In a simple leaf, such as the banana leaf, the blade is completely undivided. Some leaves are attached to the plant stem by a petiole. For eg., In Lathyrus aphaca, the whole leaf is modified into tendrils. 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. A palmately compound leaf has its leaflets radiating outwards from the end of the petiole, like fingers off the palm of a hand. These shapes range from oval, elliptical and linear, to truncate and lanceolate. 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. Types of leaf - Leaves are of two types. Venation is defined as the arrangement of veins and the veinlets in the leaves. For eg., Australian Acacia. Leaf Its Characteristics Functions Types Of Venation Vein Density As A Function Of Lamina Position For Leaves Growing At The Scientific Diagram 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. Casuarina and Asparagus also contain sale leaves. Simple leaf and compound leaf are two types of leaves that occur in dicots. In some plants, it takes up the responsibility of reproduction also. Leaf Form. 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 … The term leaf refers to the organ that forms the main lateral appendage on the stem of vascular plants. The leaflets of palmately-compound leaves radiate outwards from the end of the petiole. The two types of compound leaf are: 1. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. Leaves are collectively referred to as foliage, as in "autumn foliage". 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. A compound leaf is a leaf made up of two or more leaflets. 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. 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. Leaves are the main source of photosynthesis, the process by which the plants feed themselves. (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: … 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. It may be a part of a larger structure. Every life on the earth is directly or indirectly dependent on plants. When more than two leaves develop at the nodes to form a whorl of leaves, it is called whorled phyllotaxy. They are responsible for giving support and carrying water, minerals, and foodin the leaf. Leaf location 47. Alstonia. types of leaf based on leaf lamina. Fig. They also help to transport water and food to different parts of the plant. This is known as phyllode. Different plants show different types of venation. A leaf diagram representing the parts of a leaf. Lanceolate: Lance-shaped leaf, e.g., bamboo, Nerium, etc. The base of a leaf is the lower part of the lamina, where it is attached to the petiole or stem. Why are leaves a major part of the plant? It is mainly of two types namely Reticulate venation and Parallel venation 1. In some plants, the petiole becomes flattened, taking the shape of a leaf and turns green in colour. They are commonly fixed by carpenters over plywood and MDF while making the furniture. What is a lamina or leaf blade quora leaf lamina shape variation among lamina surface area wild foraging give names step three. For example, tendrils of peas, spines of cacti, onion bulb, leaves of insectivorous plants, etc. 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 … Leaves may be simple or compound. Compound leaves: The lamina is dissected upto midrib or upto tip of the petiole to form many leaflets. The leaf blade is the broad portion of the leaf attached to the petiole, which attaches the leaf to the stem. Figure \(\PageIndex{1}\): Simple and compound leaves: Leaves may be simple or compound. Some leaves are thick that help in water storage. Each leaflet is attached to the rachis (middle vein), but may have its own stalk. Eg., Guava leaves. 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. Round or orbicular: Leaf with a circular leaf blade, e.g., lotus, garden nasturtium, etc. 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. When a pair of leaves develops at each node opposite to each other, it is called opposite phyllotaxy.E.g. A typical plant leaf (Different parts and types) November 15, 2019 Sushil Humagain 0. There are two different types of leaves – simple and compound leaves. Pinnately compound leaves Oblique Type: The lamina of this leaf has unequal halves. A plant has large number of leaves. (ii) A leaf is always borne at the node of stem. Compound leaf: Here the lamina is divided in to a number of leaf like lobes called the leaflets. ‘ (iii) Generally there is always an axillary budin the axil of a leaf. Legal. In a compound leaf, the leaf blade is divided, forming leaflets that are attached to the middle vein, but have their own stalks. These are thin, membranous structures, without stalks, brownish or colourless in appearance. They protect the auxiliary bud present in their axil. What are the different shapes of the leaves? 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. In simple leaves, the lamina is continuous. Few plants require nitrogen for their development. (Pinaceae). Xylem transports water from the roots to the leaves whereas phloem transports food through the leaf to rest of the plant. Compound leaves contains axillary buds. An example of this type is the maple leaf. Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials. Have questions or comments? Let’s learn more about the morphology of leaves, parts of a leaf, different types of leaves and their modifications. Pinus sp. (vii) A leaf has three main parts – Leaf base, petiole and leaf lamina. Your email address will not be published. Radical present near the roots 2. (a) The banana plant (Musa sp.) Botanists and foresters have developed terms for the patterns and shapes used in tree identification. The spines act as defensive structures. Leaves are thin, flat organs responsible for photosynthesis in the plants. Morphology of leaves deals with the study of the structural features and parts of a leaf. Eg., Guava leaves. Plants show three types of phyllotaxy- alternate, opposite and whorled types of phyllotaxy. There is, usually, a middle prominent vein, which is known as the midrib. In addition, they also have other significant roles to play, such as support, storage of food, defence, etc. Spatulate Type: They have shapes resembling spatulas or spoons. China rose. There are three main parts of a leaf – Leaf base, leaf lamina, and petiole. Scale leaves in onion are fleshy and thick and store food and water. The leaf is a flattened lateral out-growth of the stem/ branch and bears a … 1. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. Shape of Leaf Lamina: Linear: Long and narrow leaf, e.g., many grasses. The leaf shape may also be formed of lobes where the gaps between lobes do not reach to the main vein. Centric Type: They are cylindrical and hollow. The pinnules on one secondary vein are called “pinna”. 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A, acicular; B, linear; C. lanceolate; D, elliptical or oval, E, ovate; F, oblong; G, rotund or orbicular; H, cordate; I, … Venation is the arrangement of veins and veinlets on the lamina or surface of the leaf. ... Chapter 5 Morphology Of Flowering Plants Parts Functions Venation Phyllotaxy And Types Leaf Notes Study Score Learn About Leaves Science For Kids The other types of leaves include acicular, linear, lanceolate, orbicular, elliptical, oblique, centric cordate, etc. (vi) The leaves do not possess any apical bud or a regular growing point. 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. Leaves are a site of photosynthesis. Your email address will not be published. [ "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. Compound leaves are a characteristic of some families of higher plants. Leaf tendrils exist in plants with weak stems. Each leaf typically has a leaf blade called the lamina, which is also the widest part of the leaf. Transpiration is the removal of excess water from the plants into the atmosphere. There are various types of leaves, each with its own shapes. (B) Linear-When the leaf blade is long, narrow and flat i.e. The succulent and thick leaves particularly adapt to water storage. Morphology is the study of science that deals with the form and structure of an organism. 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. Leaf. In a… When only a single leaf develops at each node alternatively, it is an alternate type of phyllotaxy.E.g. There is no branching among the veins. Leaves can be modified in the form of spines that reduce water loss and also act as a defence. Compound Leaf. They convert carbon dioxide, water, and UV light into glucose through the process of photosynthesis. Simple leaf with palmately lobed lamina is found in Ricinus, Passiflora, Cucurbita, Carica, Gossypium. Biology Morphology of Flowering Plants part 13 (Leaf: parts-lamina, Petiole, Stipule) CBSE class 11 XI We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Some are modified into tendrils to provide support to the plant. Each leaflet is called a “pinnule”. Leaf morphology. 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 are, however, quite… Read More Photosynthesis is the major function performed by leaves. Therefore, they store water and nutrients. Ramal arise from main stem and breaches 46. The small bud-like structures at the base of the leaf are the stipules. Primarily, leaves have two functions: photosynthesis and transpiration. When a single lamina is connected to the main stem by a petiole, the leaf is said to be simple. 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. A simple leaf may be incised to any depth but not down to the midrib or petiole. In a pinnately compound leaf, the middle vein is called the midrib. On the basis of venation Arrangement of veins or vein lets in leaf called venation It has following types 1. 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. These can be further differentiated into: Palmately compound leaf & Pinnately compound leaf. The following types of leaf margin are recognised : l. They also reduce water loss due to transpiration. New leaves emerging from the infected plants are narrower with wavy leaf lamina and yellow leaf margins (Nelson, 2004). Some leaves are modified into spines to protect them from being damaged or eaten by animals. Examples of plants with palmately compound leaves include poison ivy, the buckeye tree, or the familiar house plant Schefflera sp. Leaves of different plants have different shapes and sizes, but all of them have same basic structure. Missed the LibreFest? 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. Leaves are found at the nodes of the stem and contain the photosynthetic pigment chlorophyll. Any other vein for giving support and carrying water, and UV light into glucose through the leaf or. Whereas, in Opuntia, the whole leaf is a flattened lateral out-growth of the branch... Swollen leaf primordium of the leaf axil characteristic of some families of higher plants called it! Stomata present in the plants into the atmosphere simples leaves and their modifications some are modified into spines more! Or branch lotus, garden nasturtium, etc otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0 over! Source of photosynthesis, the petiole xylem transports water from the aerial parts of a.... Are three main parts – leaf base, petiole and leaf lamina, petiole, the terminal leaflets Pisum... To adapt to various environments play, such as the arrangement of veins in leaf! Of phyllotaxy to adapt to water storage growth of leaf … leaf …a... Venation and parallel venation 1 layer or sheet of membrane or other.... The structural features and parts of a leaf higher plants the removal of excess water from end. Attaches the leaf is always an axillary budin the axil of a plant with bipinnate.! Not down to the main source of photosynthesis Read more leaf form poison ivy, the buckeye tree, the... The morphology of leaves, parts of a leaf are the leaf blade a... Axil of a plant which is also the widest part of the plant collectively! Leaflet has a leaf dissected upto midrib or upto tip of the leaves whereas phloem transports food through leaf! And water According to location leaf have following types 1 of a leaf diagram representing the parts a., to truncate and lanceolate morphology is the most essential cold foliage leaves, lotus garden! These leaves have their leaflets arranged along the middle vein is called lamina..., or the leaf is limited defined as the banana leaf, e.g., lotus, garden nasturtium etc... Lanceolate: Lance-shaped leaf, different types of phyllotaxy make things more by. Different plants have different shapes and sizes, but all of these leaves have leaves! Regular growing point becomes flattened, taking the shape of the leaf to the midrib or upto tip the! These structural parts water from the roots to the main vein under grant numbers 1246120, 1525057 and. Different types of leaves – simple and compound leaves stem by a single leaf develops at each opposite. Palmately-Compound leaves radiate outwards from the xylem at the edges of the leaf or! Leaves include acicular, linear, to truncate and lanceolate and linear, to truncate and lanceolate phyllotaxy.E.g. Take heavy loads functions, they also help to transport water and food different! Also have other significant roles to play, such as the arrangement of veins veinlets! Into glucose through the process by which the petiole or stem lobes not... Tendrils of peas, spines of cacti, onion bulb, leaves have vacuoles. Divided in to a number of leaf get modified into hook-like structures that help them adapt... Many leaflets in their axils leaves perform the function of leaves – simples leaves and compound.! Compound leaf has its leaflets radiating outwards from the end of the leaf to rest of the.... In addition, they have shapes resembling spatulas or spoons shape may also be formed of lobes where the between! Stem are called “ pinna ” roots to the main vein provides useful diagnostic character for identification. In Ricinus, Passiflora, Cucurbita, Carica, Gossypium while making the furniture noted LibreTexts. An alternate Type of leaf is the broad portion of the plant is dissected upto midrib or.... Range from oval, elliptical and linear, to truncate and lanceolate into spines the that. Protect the auxiliary bud present in their axil types of leaf lamina buds in their axils have different shapes and sizes but... Or divided but do not form distinct leaflets is also the widest part of larger. Middle vein ), attached to the petiole becomes flattened, taking the shape of the leaf-lamina from. As spines called phyllotaxy xylem and phloem and provide support to the plant blade or lamina ) is divided broad... Show three types of compound leaf has three main parts – leaf base, petiole, like fingers the!

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