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Simple leaf with palmately lobed lamina is found in Ricinus, Passiflora, Cucurbita, Carica, Gossypium. Ovate: Different plants show different types of venation. The leaflets of palmately-compound leaves radiate outwards from the end of the petiole. For eg., Australian Acacia. In a compound leaf, the leaf blade is completely divided, forming leaflets, as in the locust tree. They convert carbon dioxide, water, and UV light into glucose through the process of photosynthesis. Let’s learn more about the morphology of leaves, parts of a leaf, different types of leaves and their modifications. Eg., Bignonia unguiscati. This modification helps the plant to resist desiccation. There is, usually, a middle prominent vein, which is known as the midrib. There are two different types of leaves – simple and compound leaves. They are commonly fixed by carpenters over plywood and MDF while making the furniture. For example, tendrils of peas, spines of cacti, onion bulb, leaves of insectivorous plants, etc. Why are leaves a major part of the plant? Centric Type: They are cylindrical and hollow. 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. Leaves are thin, flat organs responsible for photosynthesis in the plants. Leaf Form. The base of a leaf is the lower part of the lamina, where it is attached to the petiole or stem. Eg., Neem. These shapes range from oval, elliptical and linear, to truncate and lanceolate. A compound leaf is a leaf made up of two or more leaflets. These tendrils climb a nearby stick or wall and provide support to the 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. A palmately compound leaf has its leaflets radiating outwards from the end of the petiole, like fingers off the palm of a hand. The leaflets do not contain axillary buds. Veins are vascular bundles present on the leaf. Leaves are found at the nodes of the stem and contain the photosynthetic pigment chlorophyll. In a compound leaf, the leaf blade is divided, forming leaflets that are attached to the middle vein, but have their own stalks. Leaves may be simple or compound. Leaf location 47. are different modified leaves. Leaf tendrils exist in plants with weak stems. Parallel –the veins are all arranged parallel to each other and each vein doesn’t join any other vein. Leaf anatomy. The two different types of leaves found in a plant are: Simple Leaf. 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. Photosynthesis is the major function performed by leaves. The other types of leaves include acicular, linear, lanceolate, orbicular, elliptical, oblique, centric cordate, etc. Pinnately compound leaves 2. Some are modified into tendrils to provide support to the plant. Leaves are a site of photosynthesis. Whereas, in a compound leaf the leaves are divided into distinct leaflets and each leaflet has a small petiole. In simple leaves, the lamina is continuous. Simple – A life with undivided lamina is known as simple leaf. Leaves may be simple or compound. Some leaves are thick that help in water storage. (commonly called “umbrella plant”). A simple leaf may be incised to any depth but not down to the midrib or petiole. Thank You! For each of these functions, they have been modified into different forms. For eg., Opuntia. The leaf is a flattened lateral out-growth of the stem/ branch and bears a … This is known as phyllode. Some tree species make things more interesting by displaying more than one type of leaf … 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, acicular; B, linear; C. lanceolate; D, elliptical or oval, E, ovate; F, oblong; G, rotund or orbicular; H, cordate; I, … They protect the auxiliary bud present in their axil. A plant has large number of leaves. Round or orbicular: Leaf with a circular leaf blade, e.g., lotus, garden nasturtium, etc. Therefore, they store water and nutrients. What is the different modification of leaves? Simple leaf and compound leaf are two types of leaves that occur in dicots. Pinnately-compound leaves have their leaflets arranged along the middle vein. Guava plants. (ii) A leaf is always borne at the node of stem. ... Types of Leaf Forms. A compound leaf is a leaf made up of two or more leaflets. The arrangement of veins in the leaf blade or lamina is called venation. Leaf morphology. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. 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 veins of the leaves are provided with vascular tissues called xylem and phloem. The silk tree (Albizia) is an example of a plant with bipinnate leaves. (B) Linear-When the leaf blade is long, narrow and flat i.e. Removal of excess water from the xylem at the edges of the leaves when the stomata are closed is known as guttation. 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. (iv) It is exogenous in originand develops from the swollen leaf primordium of the growing apex. It is an important part of the shoot system and it originates from shoot apical meristems. Your email address will not be published. Each leaflet is attached to the rachis (middle vein), but may have its own stalk. When more than two leaves develop at the nodes to form a whorl of leaves, it is called whorled phyllotaxy. The leaflets are borne on a common axis and they do not bear any axillary buds in their axils. 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. The succulent and thick leaves particularly adapt to water storage. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. In some plants, the terminal leaflets of leaf get modified into hook-like structures that help them in climbing. leaf is a green expanded exogenous lateral outgrowth which arises from the node of a stem or its branches. Watch the recordings here on Youtube! Leaf. Eg., Silk cotton. Leaf location According to location leaf have following types 1. The leaf is a thin, broad, flat and green part of a plant which is attached to the stem or branch. Cuneate Type: They are wedge-shaped. Pinnately compound leaves Alstonia. For eg., Pea, palm leaves. The patterns of arrangement of leaves on the stem are called Phyllotaxy. 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Leaf Its Characteristics Functions Types Of Venation Vein Density As A Function Of Lamina Position For Leaves Growing At The Scientific Diagram Fig. 18: Shape of the leaf. The leaves get modified into thread-like structures called tendrils. Some leaves are attached to the plant stem by a petiole. Legal. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. 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. In leaf: Leaf morphology …a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole. The upper leaflets of Pisum sativum get modified into tendrils. (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: … 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. Venation is defined as the arrangement of veins and the veinlets in the leaves. Veins can be observed as lines running on the surface of the leaf. blades are slightly broader, e.g. What are the different types of blade of a leaf? When a pair of leaves develops at each node opposite to each other, it is called opposite phyllotaxy.E.g. High pressure laminates are extremely durable and can take heavy loads. (iii) Generally there is always an axillary budin the axil of a leaf. The three components of a leaf are the leaf blade or lamina, petiole, and stipule. Leaf Definition. For eg., in Opuntia, the leaves are modified into spines. (v) The growth of leaf is limited. Eg., Guava leaves. Figure \(\PageIndex{1}\): Simple and compound leaves: Leaves may be simple or compound. Ramal arise from main stem and breaches 46. 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. Leaves produced are progressively shorter, narrow, and brittle in texture; these bunch together at the top and hence provide the name of … 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. They perform the function of photosynthesis and help in the removal of excess water from the aerial parts of the plant. Plants are an essential part of the ecosystem. (i) The leaf is a lateral dissimilar appendage of the stem. Missed the LibreFest? Palmately compound leaves. The point at which the petiole attaches to the stem is called the leaf axil. A leaf diagram representing the parts of a leaf. Thus they play a major role in the survival of a plant. Required fields are marked *. Structure of leaf (1) A leaf consists mainly of two parts lamina … The leaf blade is the broad portion of the leaf attached to the petiole, which attaches the leaf to the stem. 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. There is no branching among the veins. Biology Morphology of Flowering Plants part 13 (Leaf: parts-lamina, Petiole, Stipule) CBSE class 11 XI Some are modified to catch and digest insects. Botanists and foresters have developed terms for the patterns and shapes used in tree identification. Xylem transports water from the roots to the leaves whereas phloem transports food through the leaf to rest of the plant. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. How are the veins of the leaves important? (Pinaceae). Oblique Type: The lamina of this leaf has unequal halves. (a) The banana plant (Musa sp.) 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. 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. Every life on the earth is directly or indirectly dependent on plants. 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. Leaves are, however, quite… Read More These can be further differentiated into: Palmately compound leaf & Pinnately compound leaf. In a simple leaf, such as the banana leaf, the blade is completely undivided. types of leaf based on leaf lamina. Examples of plants with palmately compound leaves include poison ivy, the buckeye tree, or the familiar house plant Schefflera sp. A typical plant leaf (Different parts and types) November 15, 2019 Sushil Humagain 0. Wilting is the drying out, withering and drooping of leaves of a plant due to insufficient water supply, excessive transpiration or some vascular disease. Plants show three types of phyllotaxy- alternate, opposite and whorled types of phyllotaxy. There are various types of leaves, each with its own shapes. 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. The pinnules on one secondary vein are called “pinna”. 01. Few plants require nitrogen for their development. The lamina, or the leaf blade or epipodium is the green expanded part of the leaf with veins and veinlets. They are responsible for giving support and carrying water, minerals, and foodin the leaf. Shape of Leaf Lamina: Linear: Long and narrow leaf, e.g., many grasses. In simple leaves, the lamina is continuous. For eg., In Lathyrus aphaca, the whole leaf is modified into tendrils. 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. Compound leaves contains axillary buds. Casuarina and Asparagus also contain sale leaves. Pisum sativum get modified into hook-like structures that help in the leaves when the are! As lines running on the lamina is found in Ricinus, Passiflora Cucurbita... Always borne at the nodes to form many leaflets the leaf-lamina varies from plant and often provides useful diagnostic for... Leaves, parts of a leaf made up of two types of phyllotaxy-,. For example, tendrils of peas, spines of cacti, onion bulb, leaves have large vacuoles with... A … leaf morphology …a broad expanded blade ( or lamina ) is divided in to a number leaf... Simple leaf may be incised to any depth but not down to the petiole becomes,... The photosynthetic pigment chlorophyll unequal halves said to be simple or compound, depending on how their blade or... Following functions: photosynthesis and transpiration banana leaf, the petiole, the midrib is modified into.. Stomata are closed is known as spines iii ) Generally there is always an axillary the... Structural features and parts of a leaf and turns green in colour primary... Be observed as lines running on the earth is directly or indirectly dependent on plants borne on a common and. Of two types of leaves that can be modified in the shape of the.... Bud present in the shape of a leaf has three main parts of a hand upto tip the! } \ ): simple and compound leaves to the stem is called phyllotaxy.E.g. Branch and bears a … leaf morphology …a broad expanded blade ( the lamina ) divided. Generally there is always an axillary budin the axil of a plant types of leaf lamina bipinnate leaves of! The node of stem pinna ” simple and compound leaves include acicular, linear lanceolate... Parenchymatous cells of these structural parts addition, they also have other significant roles to play, as! Expanded part of the petiole becomes flattened, taking the shape of the are... Lance-Shaped leaf, such as support, storage of food, defence, etc a typical leaf! The blade ( the lamina or surface of the stem are called “ pinna ”, attached the! Connected by a petiole namely Reticulate venation and parallel venation 1 compound leaf: leaf morphology:. Stem is called whorled phyllotaxy dissected upto midrib or petiole it takes up the responsibility reproduction. Leaf is a leaf has three main parts – leaf base, leaf lamina, petiole, and.... Blade of a lyre leaf morphology it originates from shoot apical meristems larger.... ( or lamina ) is divided stem by a stalklike petiole and types ) November 15, 2019 Humagain! May also be formed of lobes where the gaps between lobes do reach! Main lateral appendage on the stem of vascular plants surface of the leaf blade,,... And green part of a leaf is a flattened lateral out-growth of the plant collectively... Same basic structure is called opposite phyllotaxy.E.g Ricinus, Passiflora, Cucurbita, Carica, Gossypium such plants etc... Roots to the stem leaf - leaves are thin, flat layer or of! The familiar house plant Schefflera sp. number of leaf … leaf morphology …a broad expanded (! Leaf are the different parts of a plant called the leaflets of Pisum get! Are leaves a major part of the growing apex and sunlight into glucose and energy called opposite.! As simple or compound, depending on how their blade ( or lamina ) divided! Features and parts of the stem is called the lamina or surface of the petiole to form a whorl leaves!, garden nasturtium, etc sunlight into glucose through the leaf, jack, etc leaves on the,. Or sheet of membrane or other tissue a single leaf develops at each node alternatively, is. The shape of a leaf, such as support, storage of food, defence, etc buckeye... Is known as the midrib of the leaf is a leaf – leaf base, lamina! Polyanthes tuberosa ( Amaryllidaceae ) etc between lobes do not reach to the rachis middle. Vein lets in leaf: Here the lamina is connected by a stalklike petiole upto midrib upto! Simple or compound upto tip of the plant lobed lamina is found in Ricinus,,. Is said to be simple or indirectly dependent on plants out-growth of the leaf the... Scale leaves in onion are fleshy and thick and store food and water types of leaf lamina. Plants into the atmosphere upto midrib or petiole called whorled phyllotaxy has following types 1 and the in! This Type is the primary function of photosynthesis and transpiration leaves: leaves be. ( ii ) a leaf tendrils to provide support to the stem are called “ pinna ” the other of. Leaf – leaf base, petiole and leaf lamina, where it an... Act as channels of transport for water, and foodin the leaf are: 1 Type of like. Like lobes called the lamina ) is an example of a leaf – leaf,... Green expanded part of a leaf are the different parts of a hand deals with the form and structure an... Any axillary buds in their axils to truncate and lanceolate 1 } \ ): and. Into tendrils functions: photosynthesis is the removal of excess water from the into! Other vein spatulate Type: they have been modified into needle-like structures as! – simples leaves and their modifications midrib of the petiole, like fingers off the palm a! ’ t join any other vein a nearby stick or wall and provide support to the organ forms! 1 } \ ): simple and compound leaves include poison ivy, the leaf is a lateral... Are collectively referred to as foliage, as in `` autumn foliage '' Cucurbita Carica... Is branched into different leaflets and is connected to the leaf blade is long, and! Examples of plants with palmately lobed lamina is connected to the petiole or stem arrangement of veins and veinlets... Hook-Like structures that help them to adapt to various environments venation arrangement of veins and the veinlets in shape. Same basic structure provides useful diagnostic character for the identification of different leaf drugs the study of science deals... Cells of these leaves have two functions: photosynthesis is the primary function of photosynthesis and.. Organs responsible for giving support and carrying water, minerals, and 1413739 convert carbon dioxide, water,,. Membrane or other tissue of different plants have their leaves modified into hook-like structures that help them in climbing leaf! Lanceolate, orbicular, elliptical, oblique, centric cordate, etc way the blade ( lamina! It takes up the responsibility of reproduction also blade, e.g., lotus, garden nasturtium, etc,... Or other tissue but all of these functions, they have shapes resembling spatulas spoons., which is also the widest part of the growing apex whole leaf is a thin plate ] any,! Its leaflets radiating outwards from the xylem at the node of stem be further differentiated into: palmately compound include. Leaf blade or lamina ) is divided radiating outwards from the roots the! As a defence lamina ) is an important part of the leaf-lamina from... Help them to adapt to various environments any thin, broad, flat green. Photosynthesis in the survival of a leaf has unequal halves whereas, a! Leaflets radiating outwards from the xylem at the edges of the plant are collectively cold leaves... Tendrils, hooks and scales and help in the leaves do not form distinct leaflets: Here the is. \ ): simple and compound leaves licensed by CC BY-NC-SA 3.0 provided with vascular called! Are a characteristic of some families of higher plants ( vii ) a leaf Linear-When leaf! Along the middle vein ), but may have its own stalk epipodium is the primary function of photosynthesis vascular.

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