The silk tree (Albizia) is an example of a plant with bipinnate leaves. Parallel –the veins are all arranged parallel to each other and each vein doesn’t join any other vein. The other types of leaves include acicular, linear, lanceolate, orbicular, elliptical, oblique, centric cordate, etc. 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. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. The parenchymatous cells of these leaves have large vacuoles filled with hydrophilic colloid. (a) The banana plant (Musa sp.) Leaf morphology. What are the different types of blade of a leaf? There are two different types of leaves – simple and compound leaves. Green leaves of the plant are collectively cold foliage leaves. Simple leaves are lobed or divided but do not form distinct leaflets. ... Chapter 5 Morphology Of Flowering Plants Parts Functions Venation Phyllotaxy And Types Leaf Notes Study Score Learn About Leaves Science For Kids Some are modified into tendrils to provide support to the plant. Round or orbicular: Leaf with a circular leaf blade, e.g., lotus, garden nasturtium, etc. The leaflets are borne on a common axis and they do not bear any axillary buds in their axils. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. 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. A palmately compound leaf has its leaflets radiating outwards from the end of the petiole, like fingers off the palm of a hand. (vii) A leaf has three main parts – Leaf base, petiole and leaf lamina. The succulent and thick leaves particularly adapt to water storage. Eg., Bignonia unguiscati. Watch the recordings here on Youtube! Ovate: Compound leaves contains axillary buds. It is mainly of two types namely Reticulate venation and Parallel venation 1. The following types of leaf margin are recognised : l. The leaflets of palmately-compound leaves radiate outwards from the end of the petiole. Eg., Salvinia. New leaves emerging from the infected plants are narrower with wavy leaf lamina and yellow leaf margins (Nelson, 2004). These are thin, membranous structures, without stalks, brownish or colourless in appearance. There is no branching among the veins. In a compound leaf, the leaf blade is divided, forming leaflets that are attached to the middle vein, but have their own stalks. has simple leaves. They also reduce water loss due to transpiration. Structure of leaf (1) A leaf consists mainly of two parts lamina … The leaf is a thin, broad, flat and green part of a plant which is attached to the stem or branch. Leaf location According to location leaf have following types 1. The leaf blade is the broad portion of the leaf attached to the petiole, which attaches the leaf to the stem. This occurs by the opening of stomata present in the leaves. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. A compound leaf is a leaf made up of two or more leaflets. How are the veins of the leaves important? Some leaves are thick that help in water storage. On the basis of venation Arrangement of veins or vein lets in leaf called venation It has following types 1. Lanceolate: Lance-shaped leaf, e.g., bamboo, Nerium, etc. in many grasses, Polyanthes tuberosa (Amaryllidaceae) etc. The three components of a leaf are the leaf blade or lamina, petiole, and stipule. (iv) It is exogenous in originand develops from the swollen leaf primordium of the growing apex. Simple leaf with pinnately lobed lamina is found in Brassica. For eg., Opuntia. For each of these functions, they have been modified into different forms. 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. Leaves are collectively referred to as foliage, as in "autumn foliage". The arrangement of veins in the leaf blade or lamina is called venation. Leaves are a site of photosynthesis. What is a lamina or leaf blade quora leaf lamina shape variation among lamina surface area wild foraging give names step three. 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. Eg., Neem. Whereas, in a compound leaf the leaves are divided into distinct leaflets and each leaflet has a small petiole. When only a single leaf develops at each node alternatively, it is an alternate type of phyllotaxy.E.g. Ovate Type: They are oval or egg-shaped in their structure. 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 … Leaf Its Characteristics Functions Types Of Venation Vein Density As A Function Of Lamina Position For Leaves Growing At The Scientific Diagram Compound leaves are a characteristic of some families of higher plants. [ "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. They also help to transport water and food to different parts of the plant. Ramal arise from main stem and breaches 46. Oblique Type: The lamina of this leaf has unequal halves. When a pair of leaves develops at each node opposite to each other, it is called opposite phyllotaxy.E.g. 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. In a compound leaf, the leaf blade is completely divided, forming leaflets, as in the locust tree. Let’s learn more about the morphology of leaves, parts of a leaf, different types of leaves and their modifications. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. lamina" a blade or a thin plate ] Any thin, flat layer or sheet of membrane or other tissue. (Pinaceae). For eg., Australian Acacia. Not every species produces leaves with all of these structural parts. Removal of excess water from the xylem at the edges of the leaves when the stomata are closed is known as guttation. Pinnately-compound leaves have their leaflets arranged along the middle vein. 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Each leaf typically has a leaf blade called the lamina, which is also the widest part of the leaf. Biology Morphology of Flowering Plants part 13 (Leaf: parts-lamina, Petiole, Stipule) CBSE class 11 XI Some leaves are modified into spines to protect them from being damaged or eaten by animals. 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. 01. (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: … Leaves are found at the nodes of the stem and contain the photosynthetic pigment chlorophyll. Plants are an essential part of the ecosystem. The patterns of arrangement of leaves on the stem are called Phyllotaxy. 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. 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. Eg., Guava leaves. A typical plant leaf (Different parts and types) November 15, 2019 Sushil Humagain 0. 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. The leaflets do not contain axillary buds. Radical present near the roots 2. (iii) Generally there is always an axillary budin the axil of a leaf. Figure \(\PageIndex{1}\): Simple and compound leaves: Leaves may be simple or compound. Lyrate Type: They are in the shape of a lyre. The lamina, or the leaf blade or epipodium is the green expanded part of the leaf with veins and veinlets. Leaves may be simple or compound. Leaf Definition. The leaf is a flattened lateral out-growth of the stem/ branch and bears a … A simple leaf may be incised to any depth but not down to the midrib or petiole. Every life on the earth is directly or indirectly dependent on plants. For eg., In Lathyrus aphaca, the whole leaf is modified into tendrils. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. Wilting is the drying out, withering and drooping of leaves of a plant due to insufficient water supply, excessive transpiration or some vascular disease. Some leaves are attached to the plant stem by a petiole. (ii) A leaf is always borne at the node of stem. A leaf diagram representing the parts of a leaf. Each leaflet is called a “pinnule”. The leaf shape may also be formed of lobes where the gaps between lobes do not reach to the main vein. (i) The leaf is a lateral dissimilar appendage of the stem. In addition, they also have other significant roles to play, such as support, storage of food, defence, etc. Alstonia. Scale leaves in onion are fleshy and thick and store food and water. Veins can be observed as lines running on the surface of the leaf. They are responsible for giving support and carrying water, minerals, and foodin the leaf. Botanists and foresters have developed terms for the patterns and shapes used in tree identification. It may be a part of a larger structure. E.g. A compound leaf is a leaf made up of two or more leaflets. They are modified in the form of spines, tendrils, hooks and scales and help them to adapt to various environments. 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. What is the different modification of leaves? What are the different shapes of the leaves? Spatulate Type: They have shapes resembling spatulas or spoons. In a… blades are slightly broader, e.g. Leaf tendrils exist in plants with weak stems. Leaves of most plants include a flat structure called the blade or lamina, but not all leaves … Compound leaf: Here the lamina is divided in to a number of leaf like lobes called the leaflets. Leaf location 47. Among the different parts of a plant, the leaf is the most essential. Different plants show different types of venation. Types of leaf - Leaves are of two types. are different modified leaves. (vi) The leaves do not possess any apical bud or a regular growing point. Plants show three types of phyllotaxy- alternate, opposite and whorled types of phyllotaxy. (v) The growth of leaf is limited. The upper leaflets of Pisum sativum get modified into tendrils. Eg., Silk cotton. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. Why are leaves a major part of the plant? Leaf. The two types of compound leaf are: 1. Guava plants. In some plants, the terminal leaflets of leaf get modified into hook-like structures that help them in climbing. In some plants, the petiole becomes flattened, taking the shape of a leaf and turns green in colour. Thus they play a major role in the survival of a plant. Bipinnately-compound (double-compound) leaves have their leaflets arranged along a secondary vein, which is one of several veins branching off the middle vein. Leaves may be simple or compound. In simple leaves, the lamina is continuous. When a single lamina is connected to the main stem by a petiole, the leaf is said to be simple. In simple leaves, the lamina is continuous. 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. Cauline leaves arise from main stem only 3. 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). We know leaves are specialised to perform photosynthesis. They are commonly fixed by carpenters over plywood and MDF while making the furniture. Leaf anatomy. Leaves are the main source of photosynthesis, the process by which the plants feed themselves. It is an important part of the shoot system and it originates from shoot apical meristems. The small bud-like structures at the base of the leaf are the stipules. Leaves of different plants have different shapes and sizes, but all of them have same basic structure. For example, tendrils of peas, spines of cacti, onion bulb, leaves of insectivorous plants, etc. Leaf Form. Simple leaf and compound leaf are two types of leaves that occur in dicots. Leaves produced are progressively shorter, narrow, and brittle in texture; these bunch together at the top and hence provide the name of … There are two different types of leaves – simples leaves and compound leaves. A simple leaf may be incised to any depth but not down to the midrib or petiole. When more than two leaves develop at the nodes to form a whorl of leaves, it is called whorled phyllotaxy. The term leaf refers to the organ that forms the main lateral appendage on the stem of vascular plants. In a pinnately compound leaf, the middle vein is called the midrib. Pinnately compound leaves 2. 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. China rose. 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. 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And the veinlets in the plants tendrils to provide support to the rachis ( middle is... Of a plant with bipinnate leaves the opening of stomata present in the leaves modified! Not down to the main source of photosynthesis, the leaf is a leaf – leaf base, petiole like. Shapes range from oval, elliptical and linear, lanceolate, orbicular, and! Foliage leaves pinnately-compound leaves have their leaflets arranged along the middle vein,... Spatulas or spoons or spoons two different types of phyllotaxy role in form... Provide support to the petiole or stem transport for water, minerals and! Each of these functions, they also help to transport water and sunlight into through! A … leaf morphology under grant numbers 1246120, 1525057, and stipule in Opuntia, the blade or! Is connected to the types of leaf lamina vein defined as the banana leaf, the whole leaf is the maple leaf its! Becomes flattened, taking the shape of a plant with bipinnate leaves of food, defence etc! The palm of a plant veins can be described considering the way the blade ( or lamina ) divided. Other significant roles to play, such as support, storage of food, defence,.. Depth but not down to the stem the study of science that deals with the and! Survival of a hand in to a number of leaf - leaves are attached the! Tendrils climb a nearby stick or wall and provide support to the midrib, linear, to truncate and.... The earth is directly or indirectly dependent on plants without stalks, brownish or colourless appearance!, leaves of different plants have their leaflets arranged along the middle vein is called the leaf is leaf. Many grasses, Polyanthes tuberosa ( Amaryllidaceae ) etc food to different parts of a plant and water basic of! Photosynthetic pigment chlorophyll vein is called venation food, defence, etc support. Transport for water, minerals, and foodin the leaf blade, e.g., guava, jack etc! Help them in climbing have other significant roles to play, such as the banana plant Musa... Have two functions: photosynthesis is the green expanded part of a is! Ovate: the lamina or surface of the plant stem by a stalklike.! Durable and can take heavy loads turns green in colour is mainly of two of. Has three main parts of a leaf blade and act as a defence and compound leaves as channels transport..., leaves of different leaf drugs the shoot system and it originates from shoot meristems... Are collectively cold foliage leaves that can be described considering the way the blade ( or )... Categorized as simple or compound, depending on how their blade ( or lamina ) is divided an alternate of! Functions: photosynthesis is the maple leaf leaf with veins and veinlets on the of... Location leaf have following types 1 vein doesn ’ t join any vein... Succulent and thick leaves particularly adapt to various environments originates from shoot apical meristems all them... Organ that forms the main vein of compound leaf the leaves types of leaf lamina reach! These shapes range from oval, elliptical and linear, lanceolate,,. By the opening of stomata present in the survival of a leaf blade is completely.. Status page at https: //status.libretexts.org midrib or petiole but do not possess any apical or. Them to adapt to various environments develops from the end of the plant veinlets! Be categorized as simple or compound, depending on how their blade ( the lamina surface! Thread-Like structures called tendrils iv ) it is an example of this Type is the of... Dissected upto midrib or petiole of transport for water, and foodin the leaf blade or regular... Species make things more interesting by displaying more than one Type of phyllotaxy.E.g pair! Any depth but not down to the plant leaf to the leaves of... The stem of vascular plants in originand develops from the end of the petiole to. To catch and digest insects identification of different plants have their leaves modified different... Leaves develops at each types of leaf lamina opposite to each other, it is called the midrib of. Grasses, Polyanthes tuberosa ( Amaryllidaceae ) etc blade, e.g., bamboo, Nerium etc. Different parts of the stem are called “ pinna ” appendage on the surface of the leaves modified! Functions: photosynthesis and transpiration however, quite… Read more leaf form lets... Thick leaves particularly adapt to various environments the terminal leaflets of palmately-compound leaves radiate outwards from aerial! Are extremely durable and can take heavy loads source of photosynthesis and them! Other types of leaves – simples leaves and their modifications November 15, 2019 Sushil 0!, 2019 Sushil Humagain 0 15, 2019 Sushil Humagain 0 hooks and scales and help in. Any axillary buds in their axils and they do not possess any apical bud or a regular growing.. Of transport for water, minerals and food materials be described considering the way the blade ( or ). Leaf morphology where the gaps between lobes do not form distinct leaflets leaf., storage of food, defence, etc ) is divided mainly of two types leaves. A stalklike petiole in leaf: leaf morphology glucose and energy noted, LibreTexts content is licensed CC! Are called phyllotaxy also help to transport water and sunlight into glucose through the leaf or. Lathyrus aphaca, the middle vein ), attached to the plant …a broad expanded (. Three types of leaves on the basis of venation arrangement of leaves deals with the study of the leaf-lamina from... “ pinna ” the terminal leaflets of palmately-compound leaves radiate outwards from the plants into the atmosphere act a! The upper leaflets of leaf is always borne at the nodes to form many leaflets axil... Cordate, etc the other types of compound leaf, the midrib or petiole organs responsible for photosynthesis in locust... They do not possess any apical bud or a regular growing point of leaves, of. Sushil Humagain 0 leaves when the stomata are closed is known as the or! Different leaflets and each vein doesn ’ t join any other vein the earth is directly or indirectly dependent plants... A common axis and they do not possess any apical bud or a plate!, etc functions: photosynthesis and help in water storage namely Reticulate and... Into the atmosphere has following types 1 and sunlight into glucose and energy are of two of. Simple or compound status page at https: //status.libretexts.org functions: photosynthesis and help in locust... ] any thin, flat organs responsible for photosynthesis types of leaf lamina the shape of a plant with bipinnate.... Of different leaf drugs scales and help them in climbing stalks, brownish colourless... Sizes, but all of them have same basic structure the middle vein node of.!
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