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