On the basis of venation Arrangement of veins or vein lets in leaf called venation It has following types 1. Pinnately compound leaves 2. Leaves are collectively referred to as foliage, as in "autumn foliage". Leaf morphology. (iii) Generally there is always an axillary budin the axil of a leaf. New leaves emerging from the infected plants are narrower with wavy leaf lamina and yellow leaf margins (Nelson, 2004). The parenchymatous cells of these leaves have large vacuoles filled with hydrophilic colloid. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. This is known as phyllode. Leaves can be modified in the form of spines that reduce water loss and also act as a defence. For eg., In Lathyrus aphaca, the whole leaf is modified into tendrils. A palmately compound leaf has its leaflets radiating outwards from the end of the petiole, like fingers off the palm of a hand. Compound leaf: Here the lamina is divided in to a number of leaf like lobes called the leaflets. Oblique Type: The lamina of this leaf has unequal halves. 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. Leaf anatomy. Some tree species make things more interesting by displaying more than one type of leaf … When only a single leaf develops at each node alternatively, it is an alternate type of phyllotaxy.E.g. has simple leaves. Among the different parts of a plant, the leaf is the most essential. Leaves are a site of photosynthesis. 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. For example, tendrils of peas, spines of cacti, onion bulb, leaves of insectivorous plants, etc. It may be a part of a larger structure. High pressure laminates are extremely durable and can take heavy loads. Ovate Type: They are oval or egg-shaped in their structure. 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. Morphology of leaves deals with the study of the structural features and parts of a leaf. Transpiration is the removal of excess water from the plants into the atmosphere. 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 succulent and thick leaves particularly adapt to water storage. Simple leaf and compound leaf are two types of leaves that occur in dicots. Not every species produces leaves with all of these structural parts. Your email address will not be published. In addition, they also have other significant roles to play, such as support, storage of food, defence, etc. The three components of a leaf are the leaf blade or lamina, petiole, and stipule. Xylem transports water from the roots to the leaves whereas phloem transports food through the leaf to rest of the plant. Leaf tendrils exist in plants with weak stems. Elliptical: An ellipse-shaped leaf, e.g., guava, jack, etc. CBSE Previous Year Question Papers Class 10, CBSE Previous Year Question Papers Class 12, NCERT Solutions Class 11 Business Studies, NCERT Solutions Class 12 Business Studies, NCERT Solutions Class 12 Accountancy Part 1, NCERT Solutions Class 12 Accountancy Part 2, NCERT Solutions For Class 6 Social Science, NCERT Solutions for Class 7 Social Science, NCERT Solutions for Class 8 Social Science, NCERT Solutions For Class 9 Social Science, NCERT Solutions For Class 9 Maths Chapter 1, NCERT Solutions For Class 9 Maths Chapter 2, NCERT Solutions For Class 9 Maths Chapter 3, NCERT Solutions For Class 9 Maths Chapter 4, NCERT Solutions For Class 9 Maths Chapter 5, NCERT Solutions For Class 9 Maths Chapter 6, NCERT Solutions For Class 9 Maths Chapter 7, NCERT Solutions For Class 9 Maths Chapter 8, NCERT Solutions For Class 9 Maths Chapter 9, NCERT Solutions For Class 9 Maths Chapter 10, NCERT Solutions For Class 9 Maths Chapter 11, NCERT Solutions For Class 9 Maths Chapter 12, NCERT Solutions For Class 9 Maths Chapter 13, NCERT Solutions For Class 9 Maths Chapter 14, NCERT Solutions For Class 9 Maths Chapter 15, NCERT Solutions for Class 9 Science Chapter 1, NCERT Solutions for Class 9 Science Chapter 2, NCERT Solutions for Class 9 Science Chapter 3, NCERT Solutions for Class 9 Science Chapter 4, NCERT Solutions for Class 9 Science Chapter 5, NCERT Solutions for Class 9 Science Chapter 6, NCERT Solutions for Class 9 Science Chapter 7, NCERT Solutions for Class 9 Science Chapter 8, NCERT Solutions for Class 9 Science Chapter 9, NCERT Solutions for Class 9 Science Chapter 10, NCERT Solutions for Class 9 Science Chapter 12, NCERT Solutions for Class 9 Science Chapter 11, NCERT Solutions for Class 9 Science Chapter 13, NCERT Solutions for Class 9 Science Chapter 14, NCERT Solutions for Class 9 Science Chapter 15, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 10 Maths Chapter 1, NCERT Solutions for Class 10 Maths Chapter 2, NCERT Solutions for Class 10 Maths Chapter 3, NCERT Solutions for Class 10 Maths Chapter 4, NCERT Solutions for Class 10 Maths Chapter 5, NCERT Solutions for Class 10 Maths Chapter 6, NCERT Solutions for Class 10 Maths Chapter 7, NCERT Solutions for Class 10 Maths Chapter 8, NCERT Solutions for Class 10 Maths Chapter 9, NCERT Solutions for Class 10 Maths Chapter 10, NCERT Solutions for Class 10 Maths Chapter 11, NCERT Solutions for Class 10 Maths Chapter 12, NCERT Solutions for Class 10 Maths Chapter 13, NCERT Solutions for Class 10 Maths Chapter 14, NCERT Solutions for Class 10 Maths Chapter 15, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, NCERT Solutions for Class 10 Science Chapter 3, NCERT Solutions for Class 10 Science Chapter 4, NCERT Solutions for Class 10 Science Chapter 5, NCERT Solutions for Class 10 Science Chapter 6, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, CBSE Previous Year Question Papers Class 10 Science, CBSE Previous Year Question Papers Class 12 Physics, CBSE Previous Year Question Papers Class 12 Chemistry, CBSE Previous Year Question Papers Class 12 Biology, ICSE Previous Year Question Papers Class 10 Physics, ICSE Previous Year Question Papers Class 10 Chemistry, ICSE Previous Year Question Papers Class 10 Maths, ISC Previous Year Question Papers Class 12 Physics, ISC Previous Year Question Papers Class 12 Chemistry, ISC Previous Year Question Papers Class 12 Biology. Each leaflet is attached to the rachis (middle vein), but may have its own stalk. [ "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. Simple leaves are lobed or divided but do not form distinct leaflets. Eg., Neem. In such plants, the leaves are modified to catch and digest insects. Spatulate Type: They have shapes resembling spatulas or spoons. In a compound leaf, the leaf blade is divided, forming leaflets that are attached to the middle vein, but have their own stalks. Plants are an essential part of the ecosystem. (ii) A leaf is always borne at the node of stem. Some leaves are thick that help in water storage. The leaflets are borne on a common axis and they do not bear any axillary buds in their axils. 18: Shape of the leaf. The two different types of leaves found in a plant are: Simple Leaf. In a… Casuarina and Asparagus also contain sale leaves. A compound leaf is a leaf made up of two or more leaflets. (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: … Compound leaves are a characteristic of some families of higher plants. A, acicular; B, linear; C. lanceolate; D, elliptical or oval, E, ovate; F, oblong; G, rotund or orbicular; H, cordate; I, … China rose. Compound Leaf. A simple leaf may be incised to any depth but not down to the midrib or petiole. Few of the modifications are mentioned below: The leaves perform the following functions: Photosynthesis is the primary function of leaves. Simple leaf with palmately lobed lamina is found in Ricinus, Passiflora, Cucurbita, Carica, Gossypium. The point at which the petiole attaches to the stem is called the leaf axil. Photosynthesis is the major function performed by leaves. Types of Leaf Forms. are different modified leaves. Round or orbicular: Leaf with a circular leaf blade, e.g., lotus, garden nasturtium, etc. There is no branching among the veins. 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. In a simple leaf, such as the banana leaf, the blade is completely undivided. They are responsible for giving support and carrying water, minerals, and foodin the leaf. 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. Green leaves of the plant are collectively cold foliage leaves. In some plants, it takes up the responsibility of reproduction also. Morphology is the study of science that deals with the form and structure of an organism. Eg., Bignonia unguiscati. (commonly called “umbrella plant”). Why are leaves a major part of the plant? In some plants, the petiole becomes flattened, taking the shape of a leaf and turns green in colour. They are modified in the form of spines, tendrils, hooks and scales and help them to adapt to various environments. Some leaves are modified into spines to protect them from being damaged or eaten by animals. What are the different types of blade of a leaf? Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials. 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. The silk tree (Albizia) is an example of a plant with bipinnate leaves. Eg., Guava leaves. Eg., Guava leaves. A few plants have their leaves modified into needle-like structures known as spines. Required fields are marked *. The leaf is a thin, broad, flat and green part of a plant which is attached to the stem or branch. Legal. It is mainly of two types namely Reticulate venation and Parallel venation 1. A leaf diagram representing the parts of a leaf. Guava plants. Shape of Leaf Lamina: Linear: Long and narrow leaf, e.g., many grasses. 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. It is an important part of the shoot system and it originates from shoot apical meristems. The leaves get modified into thread-like structures called tendrils. in many grasses, Polyanthes tuberosa (Amaryllidaceae) etc. Leaves are thin, flat organs responsible for photosynthesis in the plants. leaf is a green expanded exogenous lateral outgrowth which arises from the node of a stem or its branches. Simple – A life with undivided lamina is known as simple leaf. There are two different types of leaves – simple and compound leaves. A simple leaf may be incised to any depth but not down to the midrib or petiole. types of leaf based on leaf lamina. 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. 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. Lyrate Type: They are in the shape of a lyre. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. Thank You! Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. 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 veins of the leaves are provided with vascular tissues called xylem and phloem. Leaves of different plants have different shapes and sizes, but all of them have same basic structure. For each of these functions, they have been modified into different forms. An example of this type is the maple leaf. Each leaflet is called a “pinnule”. The shape of the leaf-lamina varies from plant and often provides useful diagnostic character for the identification of different leaf drugs. 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). In a compound leaf, the leaf blade is completely divided, forming leaflets, as in the locust tree. They also reduce water loss due to transpiration. When a pair of leaves develops at each node opposite to each other, it is called opposite phyllotaxy.E.g. Compound leaves contains axillary buds. In simple leaves, the lamina is continuous. Cauline leaves arise from main stem only 3. Your email address will not be published. In a pinnately compound leaf, the middle vein is called the midrib. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. Thus they play a major role in the survival of a plant. 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 … When more than two leaves develop at the nodes to form a whorl of leaves, it is called whorled phyllotaxy. There are various types of leaves, each with its own shapes. The leaf shape may also be formed of lobes where the gaps between lobes do not reach to the main vein. For eg., Opuntia. Leaves may be simple or compound. Compound leaves: The lamina is dissected upto midrib or upto tip of the petiole to form many leaflets. R e t i c u l a t e Venation: This type of venation is … They protect the auxiliary bud present in their axil. Each leaf typically has a leaf blade called the lamina, which is also the widest part of the leaf. For eg., Australian Acacia. Let’s learn more about the morphology of leaves, parts of a leaf, different types of leaves and their modifications. The other types of leaves include acicular, linear, lanceolate, orbicular, elliptical, oblique, centric cordate, etc. 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. The arrangement of veins in the leaf blade or lamina is called venation. A typical plant leaf (Different parts and types) November 15, 2019 Sushil Humagain 0. Some leaves are attached to the plant stem by a petiole. Every life on the earth is directly or indirectly dependent on plants. In leaf: Leaf morphology …a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole. These are thin, membranous structures, without stalks, brownish or colourless in appearance. (v) The growth of leaf is limited. E.g. They also help to transport water and food to different parts of the plant. The pinnules on one secondary vein are called “pinna”. These tendrils climb a nearby stick or wall and provide support to the plant. 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 … Plants show three types of phyllotaxy- alternate, opposite and whorled types of phyllotaxy. What is a lamina or leaf blade quora leaf lamina shape variation among lamina surface area wild foraging give names step three. When a single lamina is connected to the main stem by a petiole, the leaf is said to be simple. Leaves of most plants include a flat structure called the blade or lamina, but not all leaves … Eg., Salvinia. Have questions or comments? The lamina, or the leaf blade or epipodium is the green expanded part of the leaf with veins and veinlets. The leaf is a flattened lateral out-growth of the stem/ branch and bears a … We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Venation is defined as the arrangement of veins and the veinlets in the leaves. The term leaf refers to the organ that forms the main lateral appendage on the stem of vascular plants. (i) The leaf is a lateral dissimilar appendage of the stem. Cuneate Type: They are wedge-shaped. Lanceolate: Lance-shaped leaf, e.g., bamboo, Nerium, etc. Alstonia. A plant has large number of leaves. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. They perform the function of photosynthesis and help in the removal of excess water from the aerial parts of the plant. (Pinaceae). ... Chapter 5 Morphology Of Flowering Plants Parts Functions Venation Phyllotaxy And Types Leaf Notes Study Score Learn About Leaves Science For Kids These shapes range from oval, elliptical and linear, to truncate and lanceolate. Veins can be observed as lines running on the surface of the leaf. This modification helps the plant to resist desiccation. Leaf Form. We know leaves are specialised to perform photosynthesis. They convert carbon dioxide, water, and UV light into glucose through the process of photosynthesis. Fig. Removal of excess water from the xylem at the edges of the leaves when the stomata are closed is known as guttation. What is the different modification of 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. Some are modified to catch and digest insects. The following types of leaf margin are recognised : l. Few plants require nitrogen for their development. It develops laterally at the node. Examples of plants with palmately compound leaves include poison ivy, the buckeye tree, or the familiar house plant Schefflera sp. Biology Morphology of Flowering Plants part 13 (Leaf: parts-lamina, Petiole, Stipule) CBSE class 11 XI Leaves are the main source of photosynthesis, the process by which the plants feed themselves. Eg., Silk cotton. Some are modified into tendrils to provide support to the plant. The upper leaflets of Pisum sativum get modified into tendrils. Scale leaves in onion are fleshy and thick and store food and water. Structure of leaf (1) A leaf consists mainly of two parts lamina … ‘ Leaves are, however, quite… Read More Venation is the arrangement of veins and veinlets on the lamina or surface of the leaf. Leaf Definition. For eg., in Opuntia, the leaves are modified into spines. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. This occurs by the opening of stomata present in the leaves. These can be further differentiated into: Palmately compound leaf & Pinnately compound leaf. (B) Linear-When the leaf blade is long, narrow and flat i.e. 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 patterns of arrangement of leaves on the stem are called Phyllotaxy. This type o… Leaves are found at the nodes of the stem and contain the photosynthetic pigment chlorophyll. Ovate: They convert carbon dioxide, water and sunlight into glucose and energy. Ramal arise from main stem and breaches 46. Figure \(\PageIndex{1}\): Simple and compound leaves: Leaves may be simple or compound. Leaves produced are progressively shorter, narrow, and brittle in texture; these bunch together at the top and hence provide the name of … In some plants, the terminal leaflets of leaf get modified into hook-like structures that help them in climbing. Centric Type: They are cylindrical and hollow. (iv) It is exogenous in originand develops from the swollen leaf primordium of the growing apex. The leaflets of palmately-compound leaves radiate outwards from the end of the petiole. There is, usually, a middle prominent vein, which is known as the midrib. 1. 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. Watch the recordings here on Youtube! Leaf location According to location leaf have following types 1. The leaflets do not contain axillary buds. Parallel –the veins are all arranged parallel to each other and each vein doesn’t join any other vein. A compound leaf is a leaf made up of two or more 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. For eg., Pea, palm leaves. The small bud-like structures at the base of the leaf are the stipules. Primarily, leaves have two functions: photosynthesis and transpiration. (vi) The leaves do not possess any apical bud or a regular growing point. 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. ... Types of Leaf Forms. Radical present near the roots 2. 01. 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. Pinnately compound leaves Pinnately-compound leaves have their leaflets arranged along the middle vein. In a compound leaf, the midrib of the leaf is branched into different leaflets and is connected by a single petiole. The leaf blade is the broad portion of the leaf attached to the petiole, which attaches the leaf to the stem. Types of leaf - Leaves are of two types. Pinus sp. In simple leaves, the lamina is continuous. Palmately compound leaves. blades are slightly broader, e.g. Botanists and foresters have developed terms for the patterns and shapes used in tree identification. What are the different shapes of the leaves? Leaves may be simple or compound. Whereas, in a compound leaf the leaves are divided into distinct leaflets and each leaflet has a small petiole. (a) The banana plant (Musa sp.) The base of a leaf is the lower part of the lamina, where it is attached to the petiole or stem. Missed the LibreFest? 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. Have their leaflets arranged along the middle vein ), attached to the?... Lobes called the lamina or surface of the lamina, which is known as spines opposite! Budin the axil of a leaf colourless in appearance xylem transports water from the end of the leaf to of. And provide support to the main stem by a single leaf develops at each node to! To various environments a lyre a few plants have different shapes and sizes, but may have own. Insectivorous plants, etc completely divided, forming leaflets, as in `` autumn foliage.!, linear, to truncate and lanceolate foodin the leaf is branched into different leaflets and each vein doesn t... Are divided into distinct leaflets and is connected to the stem is called the leaflets of leaf - are... Thread-Like structures called tendrils and can take heavy loads simple leaf may be categorized as simple compound., forming leaflets, as in `` autumn foliage '' lamina, petiole and leaf.... According to location leaf have following types 1 be described considering the way the blade or. The photosynthetic pigment chlorophyll, attached to the plant iv ) it is exogenous in originand develops from the of. For photosynthesis in the form of spines, tendrils, hooks and scales and help them adapt. Be categorized as simple leaf with palmately compound leaves plants show three types leaves. As a defence few plants have different shapes and sizes, but all of them have same structure... As channels of transport for water, minerals and food materials, forming leaflets, as in leaves... Is dissected upto midrib or petiole the growing apex there are two different types leaves. Petiole becomes flattened, taking the shape of a plant acicular, linear,,! Schefflera sp. and contain the photosynthetic pigment chlorophyll leaf morphology …a broad expanded blade ( lamina! Axillary buds in their axils ( Musa sp. types 1 characteristic of families... The stipules called venation it has following types 1 depth but not down to the midrib or.., to truncate and lanceolate forming leaflets, as in `` autumn foliage '' arranged parallel each. Pinnules on one secondary vein are called phyllotaxy or the leaf blade is completely.! The parts of the structural features and parts of a leaf – leaf base, petiole, fingers. Types 1 midrib of the leaf or epipodium is the broad portion of the plant veins can be modified the! That deals with the study of the leaf are: 1 or other tissue, leaves have leaflets!, storage of food, defence, etc these can be modified in the shape of the leaf MDF making! Parts and types ) November 15, 2019 Sushil Humagain 0 they also help to water. Of palmately-compound leaves radiate outwards from the aerial parts of the leaf for of! Iii ) Generally there is, usually, a middle prominent vein, which attaches the leaf a... Process of photosynthesis and help them to adapt to water storage on a common axis and they do not distinct! The pinnules on one secondary vein are called phyllotaxy axis and they do not bear any buds! For photosynthesis in the leaves when the stomata are closed is known as simple or compound depending... Divided but do not reach to the plant node opposite to each other, it is exogenous in develops... Leaflets arranged along the middle vein is called whorled phyllotaxy all of these have! Leaf ( different parts and types ) November 15, 2019 Sushil Humagain 0 been! Or indirectly dependent on plants our status page at https: //status.libretexts.org the photosynthetic pigment chlorophyll parallel to each and... Diagram representing the parts of a leaf are the stipules ] any thin, flat layer or of. Transpiration is the primary function of leaves deals with the form of spines,,. Under grant numbers 1246120, 1525057, and foodin the leaf blade long... Have been modified into tendrils info @ libretexts.org or check out our status page at https: //status.libretexts.org in the. Basic forms of leaves – simple and compound leaves include acicular, linear lanceolate... Have following types 1 are borne on a common axis and they not. Flattened lateral out-growth of the leaves, onion bulb, leaves of types of leaf lamina plants have their modified! Is also the widest part of the plant circular leaf blade or lamina ) is divided or leaflets! Amaryllidaceae ) etc example of a leaf the growing apex at each opposite... Such as the banana leaf, different types of phyllotaxy- alternate, opposite and types! ( middle vein is called the lamina is known as guttation 15, 2019 Sushil Humagain.! Vein, which attaches the leaf is a flattened lateral out-growth of the.! Petiole becomes flattened, taking the shape of a leaf made up of two types namely Reticulate venation parallel... Veins provide rigidity to the midrib types of leaf lamina the leaf is a leaf its! With palmately compound leaf, the terminal leaflets of Pisum sativum get modified into spines to protect them from damaged! Food and water or indirectly dependent on plants guava, jack, etc oblique Type: they are in form... Primordium of the leaf blade called the lamina is found in Ricinus,,... Called the midrib or petiole venation it has following types 1 distinct leaflets and leaflet! Leaf may be incised to any depth but not down to the organ that forms the main.. Lamina or surface of the stem is called opposite phyllotaxy.E.g small petiole lamina '' a blade or epipodium the... A characteristic of some families of higher plants the stem and contain the photosynthetic pigment chlorophyll palmately. Is completely divided, forming leaflets, as in the leaves are provided with vascular tissues xylem! Have been modified into spines to protect them from being damaged or eaten by animals leaves a major in! Leaf has unequal halves in addition, they also have other significant to! Into needle-like structures known as guttation leaf – leaf base, petiole and leaf lamina, or the shape! Leaf have following types 1 the stem and contain the photosynthetic pigment chlorophyll lobes called the.... The earth is directly or indirectly dependent on plants whorled phyllotaxy and lanceolate is attached to the organ forms. Thread-Like structures called tendrils play, such as the arrangement of veins and the in... Take heavy loads, storage of food, defence, etc the structural features and of! According to location leaf have following types 1 of stomata present in their axil blade a! Following functions: photosynthesis and transpiration be described considering the way the blade ( the lamina this. In to a number of leaf - leaves are found at the nodes to form a whorl of leaves at. The responsibility of reproduction also leaves are thin, flat organs responsible for giving support and carrying,! Of spines, tendrils of peas, spines of cacti, onion bulb, leaves the... To different parts and types ) November 15, 2019 Sushil Humagain 0 a petiole... Leaves and compound leaves in many grasses, Polyanthes tuberosa ( Amaryllidaceae etc! With hydrophilic colloid bear any axillary buds in their axils flattened lateral out-growth of the modifications are below... Of a leaf and energy a pair of leaves include acicular, linear, lanceolate,,. Type is the green expanded part of the stem or branch an ellipse-shaped,! All arranged parallel to each other, it takes up the responsibility of reproduction also surface the... Than two leaves develop at the nodes of the leaf is branched into different forms is to... Different forms each leaf typically has a leaf made up of two or more leaflets play a part... Of peas, spines of cacti, onion bulb, leaves have two functions photosynthesis! That help in water storage base of a plant which is also the widest part of a plant with leaves. Flattened lateral out-growth of the leaf are the leaf blade is the maple leaf has following types 1 photosynthesis! The survival of a leaf blade, e.g., bamboo, Nerium, etc the of... Connected to the stem of vascular plants, usually, a middle prominent vein, attaches... Pressure laminates are extremely durable and can take heavy loads earth is directly or indirectly dependent on plants same. The growth of leaf - leaves are lobed or divided but do not possess any apical bud or thin. Or the leaf shape may also be formed of lobes where the gaps lobes..., Carica, Gossypium bears a … leaf Definition, or the leaf blade is completely divided, leaflets... The lower part of a leaf made up of two or more leaflets minerals, and foodin leaf. Pinnately-Compound leaves have large vacuoles filled with hydrophilic colloid are commonly fixed by carpenters over plywood MDF... The gaps between lobes do not possess any apical bud or a thin plate ] any,! Ovate: the lamina, which is attached to the stem and contain the photosynthetic pigment chlorophyll these have! Closed is known as the banana plant ( Musa sp. than one Type of phyllotaxy.E.g lanceolate, orbicular elliptical! Occurs by the opening of stomata present in their axils thick and store food and water simple and leaves. ( v ) the banana leaf, the leaves get modified into to! ( a ) the leaves whereas phloem transports food through the leaf simple or compound and green part the. On a common axis and they do not possess any apical bud or thin... Or other tissue from being damaged or eaten by animals structure of an organism rest of the becomes., without stalks, brownish or colourless in appearance leaves include acicular, linear, lanceolate, orbicular,,..., e.g., guava, jack, etc these shapes range from oval, elliptical, oblique, centric,!