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What is a lamina or leaf blade quora leaf lamina shape variation among lamina surface area wild foraging give names step three. Lanceolate: Lance-shaped leaf, e.g., bamboo, Nerium, etc. 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. 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. 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 … Structure of leaf (1) A leaf consists mainly of two parts lamina … An example of this type is the maple leaf. In some plants, the terminal leaflets of leaf get modified into hook-like structures that help them in climbing. Casuarina and Asparagus also contain sale leaves. Plants are an essential part of the ecosystem. Examples of plants with palmately compound leaves include poison ivy, the buckeye tree, or the familiar house plant Schefflera sp. Morphology is the study of science that deals with the form and structure of an organism. This modification helps the plant to resist desiccation. 1. The leaf is a flattened lateral out-growth of the stem/ branch and bears a … Thus they play a major role in the survival of a plant. The small bud-like structures at the base of the leaf are the stipules. Types of Leaf Forms. are different modified leaves. Eg., Silk cotton. The two different types of leaves found in a plant are: Simple Leaf. in many grasses, Polyanthes tuberosa (Amaryllidaceae) etc. Each leaf typically has a leaf blade called the lamina, which is also the widest part of the leaf. Leaves are the main source of photosynthesis, the process by which the plants feed themselves. Types of leaf - Leaves are of two types. (B) Linear-When the leaf blade is long, narrow and flat i.e. 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. Therefore, they store water and nutrients. 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. The pinnules on one secondary vein are called “pinna”. In simple leaves, the lamina is continuous. Some are modified to catch and digest insects. 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 leaf shape may also be formed of lobes where the gaps between lobes do not reach to the main vein. In some plants, the petiole becomes flattened, taking the shape of a leaf and turns green in colour. Pinnately compound leaves Venation is defined as the arrangement of veins and the veinlets in the leaves. (iv) It is exogenous in originand develops from the swollen leaf primordium of the growing apex. Botanists and foresters have developed terms for the patterns and shapes used in tree identification. Leaf location According to location leaf have following types 1. This type o… Your email address will not be published. Eg., Guava leaves. [ "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. Leaves may be simple or compound. Elliptical: An ellipse-shaped leaf, e.g., guava, jack, etc. 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. Leaves are found at the nodes of the stem and contain the photosynthetic pigment chlorophyll. ... Types of Leaf Forms. Pinnately compound leaves 2. Compound Leaf. A compound leaf is a leaf made up of two or more leaflets. The leaf blade is the broad portion of the leaf attached to the petiole, which attaches the leaf to the stem. For example, tendrils of peas, spines of cacti, onion bulb, leaves of insectivorous plants, etc. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. 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. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. We know leaves are specialised to perform photosynthesis. Biology Morphology of Flowering Plants part 13 (Leaf: parts-lamina, Petiole, Stipule) CBSE class 11 XI Veins are vascular bundles present on the leaf. Eg., Neem. 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. 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. In a compound leaf, the midrib of the leaf is branched into different leaflets and is connected by a single petiole. The other types of leaves include acicular, linear, lanceolate, orbicular, elliptical, oblique, centric cordate, etc. blades are slightly broader, e.g. The spines act as defensive structures. The shape of the leaf-lamina varies from plant and often provides useful diagnostic character for the identification of different leaf drugs. In leaf: Leaf morphology …a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole. Leaves are collectively referred to as foliage, as in "autumn foliage". Leaves of different plants have different shapes and sizes, but all of them have same basic structure. (i) The leaf is a lateral dissimilar appendage of the stem. There are various types of leaves, each with its own shapes. Transpiration is the removal of excess water from the plants into the atmosphere. They also reduce water loss due to transpiration. For each of these functions, they have been modified into different forms. The structure of a leaf is described below in detail : Generally, leaf base, petiole, and lamina, together form the main parts of a  leaf. Simple leaf and compound leaf are two types of leaves that occur in dicots. (Pinaceae). 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. The leaflets are borne on a common axis and they do not bear any axillary buds in their axils. The veins of the leaves are provided with vascular tissues called xylem and phloem. Venation is the arrangement of veins and veinlets on the lamina or surface of the leaf. A few plants have their leaves modified into needle-like structures known as spines. Photosynthesis is the major function performed by leaves. Leaf Its Characteristics Functions Types Of Venation Vein Density As A Function Of Lamina Position For Leaves Growing At The Scientific Diagram Parallel –the veins are all arranged parallel to each other and each vein doesn’t join any other vein. has simple leaves. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. Not every species produces leaves with all of these structural parts. 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. In a… Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. Leaves are, however, quite… Read More The leaf is a thin, broad, flat and green part of a plant which is attached to the stem or branch. (v) The growth of leaf is limited. Whereas, in a compound leaf the leaves are divided into distinct leaflets and each leaflet has a small petiole. The three components of a leaf are the leaf blade or lamina, petiole, and stipule. Watch the recordings here on Youtube! 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. A typical plant leaf (Different parts and types) November 15, 2019 Sushil Humagain 0. The lamina, or the leaf blade or epipodium is the green expanded part of the leaf with veins and veinlets. The silk tree (Albizia) is an example of a plant with bipinnate leaves. Some leaves are thick that help in water storage. It develops laterally at the node. In simple leaves, the lamina is continuous. Ovate: Leaves can be modified in the form of spines that reduce water loss and also act as a defence. Veins can be observed as lines running on the surface of the leaf. Simple leaf with pinnately lobed lamina is found in Brassica. For eg., Opuntia. When a single lamina is connected to the main stem by a petiole, the leaf is said to be simple. Some leaves are attached to the plant stem by a petiole. (commonly called “umbrella plant”). New leaves emerging from the infected plants are narrower with wavy leaf lamina and yellow leaf margins (Nelson, 2004). Different plants show different types of venation. Leaf anatomy. A leaf diagram representing the parts of a leaf. (vi) The leaves do not possess any apical bud or a regular growing point. Oblique Type: The lamina of this leaf has unequal halves. The term leaf refers to the organ that forms the main lateral appendage on the stem of vascular plants. Guava plants. Leaf morphology. For eg., Australian Acacia. 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 … High pressure laminates are extremely durable and can take heavy loads. Ramal arise from main stem and breaches 46. (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: … 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. R e t i c u l a t e Venation: This type of venation is … What is the different modification of leaves? ‘ Legal. Simple – A life with undivided lamina is known as simple leaf. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. There are two different types of leaves – simples leaves and compound leaves. Green leaves of the plant are collectively cold foliage leaves. The leaflets do not contain axillary buds. Simple leaves are lobed or divided but do not form distinct leaflets. The two types of compound leaf are: 1. When only a single leaf develops at each node alternatively, it is an alternate type of phyllotaxy.E.g. Cuneate Type: They are wedge-shaped. The arrangement of veins in the leaf blade or lamina is called venation. Removal of excess water from the xylem at the edges of the leaves when the stomata are closed is known as guttation. They convert carbon dioxide, water and sunlight into glucose and energy. E.g. Simple leaf with palmately lobed lamina is found in Ricinus, Passiflora, Cucurbita, Carica, Gossypium. The upper leaflets of Pisum sativum get modified into tendrils. Leaves of most plants include a flat structure called the blade or lamina, but not all leaves … In a pinnately compound leaf, the middle vein is called the midrib. Have questions or comments? Scale leaves in onion are fleshy and thick and store food and water. When a pair of leaves develops at each node opposite to each other, it is called opposite phyllotaxy.E.g. Few of the modifications are mentioned below: The leaves perform the following functions: Photosynthesis is the primary function of leaves. Leaves may be simple or compound. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. The following types of leaf margin are recognised : l. There are three main parts of a leaf – Leaf base, leaf lamina, and petiole. Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials. Round or orbicular: Leaf with a circular leaf blade, e.g., lotus, garden nasturtium, etc. Leaves produced are progressively shorter, narrow, and brittle in texture; these bunch together at the top and hence provide the name of … There is no branching among the veins. Each leaflet is attached to the rachis (middle vein), but may have its own stalk. It is an important part of the shoot system and it originates from shoot apical meristems. Your email address will not be published. The patterns of arrangement of leaves on the stem are called Phyllotaxy. There are two different types of leaves – simple and compound leaves. In addition, they also have other significant roles to play, such as support, storage of food, defence, etc. For eg., Pea, palm leaves. These can be further differentiated into: Palmately compound leaf & Pinnately compound leaf. The base of a leaf is the lower part of the lamina, where it is attached to the petiole or stem. 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Flattened, taking the shape of the stem/ branch and bears a … leaf.. Can be described considering the way the blade ( the lamina is as... Leaves have large vacuoles filled with hydrophilic colloid when only a single lamina is called venation it following.

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