Plants show three types of phyllotaxy- alternate, opposite and whorled types of phyllotaxy. What are the different types of blade of a leaf? Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. Different plants show different types of venation. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. They protect the auxiliary bud present in their axil. 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. In simple leaves, the lamina is continuous. Eg., Guava leaves. Your email address will not be published. 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. When a single lamina is connected to the main stem by a petiole, the leaf is said to be simple. Thank You! For example, tendrils of peas, spines of cacti, onion bulb, leaves of insectivorous plants, etc. Compound Leaf. Oblique Type: The lamina of this leaf has unequal halves. 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. Every life on the earth is directly or indirectly dependent on plants. 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. In some plants, it takes up the responsibility of reproduction also. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. The leaflets are borne on a common axis and they do not bear any axillary buds in their axils. When only a single leaf develops at each node alternatively, it is an alternate type of phyllotaxy.E.g. There are two different types of leaves – simple and compound leaves. The upper leaflets of Pisum sativum get modified into tendrils. There are two different types of leaves – simples leaves and compound leaves. For eg., Australian Acacia. 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. blades are slightly broader, e.g. Leaves are collectively referred to as foliage, as in "autumn foliage". Eg., Bignonia unguiscati. Legal. Scale leaves in onion are fleshy and thick and store food and water. The small bud-like structures at the base of the leaf are the stipules. Ovate Type: They are oval or egg-shaped in their structure. Therefore, they store water and nutrients. 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. It may be a part of a larger structure. Leaves can be modified in the form of spines that reduce water loss and also act as a defence. 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 structure of a leaf is described below in detail : Generally, leaf base, petiole, and lamina, together form the main parts of a  leaf. Required fields are marked *. Leaf Its Characteristics Functions Types Of Venation Vein Density As A Function Of Lamina Position For Leaves Growing At The Scientific Diagram 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. Green leaves of the plant are collectively cold foliage leaves. Watch the recordings here on Youtube! types of leaf based on leaf lamina. Simple leaf and compound leaf are two types of leaves that occur in dicots. A compound leaf is a leaf made up of two or more leaflets. They convert carbon dioxide, water, and UV light into glucose through the process of photosynthesis. 1. The succulent and thick leaves particularly adapt to water storage. Let’s learn more about the morphology of leaves, parts of a leaf, different types of leaves and their modifications. Veins are vascular bundles present on the leaf. Leaves are, however, quite… Read More Ovate: A typical plant leaf (Different parts and types) November 15, 2019 Sushil Humagain 0. Eg., Neem. The point at which the petiole attaches to the stem is called the leaf axil. 01. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Some leaves are modified into spines to protect them from being damaged or eaten by animals. There is, usually, a middle prominent vein, which is known as the midrib. The leaf shape may also be formed of lobes where the gaps between lobes do not reach to the main vein. Compound leaves: The lamina is dissected upto midrib or upto tip of the petiole to form many leaflets. They perform the function of photosynthesis and help in the removal of excess water from the aerial parts of the plant. (vi) The leaves do not possess any apical bud or a regular growing point. Missed the LibreFest? Eg., Guava leaves. These can be further differentiated into: Palmately compound leaf & Pinnately compound leaf. Venation is defined as the arrangement of veins and the veinlets in the leaves. The two types of compound leaf are: 1. Some leaves are attached to the plant stem by a petiole. For eg., Pea, palm leaves. Pinnately compound leaves 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. Ramal arise from main stem and breaches 46. In some plants, the petiole becomes flattened, taking the shape of a leaf and turns green in colour. A leaf diagram representing the parts of a leaf. A, acicular; B, linear; C. lanceolate; D, elliptical or oval, E, ovate; F, oblong; G, rotund or orbicular; H, cordate; I, … Bipinnately-compound (double-compound) leaves have their leaflets arranged along a secondary vein, which is one of several veins branching off the middle vein. 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. They are modified in the form of spines, tendrils, hooks and scales and help them to adapt to various environments. Among the different parts of a plant, the leaf is the most essential. has simple leaves. Have questions or comments? 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 three components of a leaf are the leaf blade or lamina, petiole, and stipule. How are the veins of the leaves important? Leaf Form. The shape of the leaf-lamina varies from plant and often provides useful diagnostic character for the identification of different leaf drugs. Simple – A life with undivided lamina is known as simple leaf. Lyrate Type: They are in the shape of a lyre. Round or orbicular: Leaf with a circular leaf blade, e.g., lotus, garden nasturtium, etc. Lanceolate: Lance-shaped leaf, e.g., bamboo, Nerium, etc. A compound leaf is a leaf made up of two or more leaflets. 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 … New leaves emerging from the infected plants are narrower with wavy leaf lamina and yellow leaf margins (Nelson, 2004). Parallel –the veins are all arranged parallel to each other and each vein doesn’t join any other vein. 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. For eg., In Lathyrus aphaca, the whole leaf is modified into tendrils. What is the different modification of leaves? Plants are an essential part of the ecosystem. In addition, they also have other significant roles to play, such as support, storage of food, defence, etc. Spatulate Type: They have shapes resembling spatulas or spoons. 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). The patterns of arrangement of leaves on the stem are called Phyllotaxy. In some plants, the terminal leaflets of leaf get modified into hook-like structures that help them in climbing. R e t i c u l a t e Venation: This type of venation is … The leaf is a thin, broad, flat and green part of a plant which is attached to the stem or branch. The spines act as defensive structures. Leaf location According to location leaf have following types 1. Leaves produced are progressively shorter, narrow, and brittle in texture; these bunch together at the top and hence provide the name of … (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: … are different modified leaves. Leaves are found at the nodes of the stem and contain the photosynthetic pigment chlorophyll. Fig. These tendrils climb a nearby stick or wall and provide support to the plant. 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. When a pair of leaves develops at each node opposite to each other, it is called opposite phyllotaxy.E.g. These are thin, membranous structures, without stalks, brownish or colourless in appearance. (B) Linear-When the leaf blade is long, narrow and flat i.e. A simple leaf may be incised to any depth but not down to the midrib or petiole. Morphology is the study of science that deals with the form and structure of an organism. Each leaflet is attached to the rachis (middle vein), but may have its own stalk. Leaf location 47. Types of Leaf Forms. The parenchymatous cells of these leaves have large vacuoles filled with hydrophilic colloid. (Pinaceae). leaf is a green expanded exogenous lateral outgrowth which arises from the node of a stem or its branches. Guava plants. Leaf Definition. (a) The banana plant (Musa sp.) In such plants, the leaves are modified to catch and digest insects. We know leaves are specialised to perform photosynthesis. Venation is the arrangement of veins and veinlets on the lamina or surface of the leaf. Biology Morphology of Flowering Plants part 13 (Leaf: parts-lamina, Petiole, Stipule) CBSE class 11 XI Whereas, in a compound leaf the leaves are divided into distinct leaflets and each leaflet has a small petiole. Leaf tendrils exist in plants with weak stems. For eg., in Opuntia, the leaves are modified into spines. Removal of excess water from the xylem at the edges of the leaves when the stomata are closed is known as guttation. Palmately compound leaves. 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Read more leaf form nasturtium, etc common axis and they do not to!, storage of food, defence, etc various types of leaves deals the... Poison ivy, the leaf is a leaf their modifications and digest insects a petiole... Lobed lamina is called opposite phyllotaxy.E.g: the lamina of this leaf has its leaflets radiating outwards the! Modified in the survival of a leaf branch and bears a … leaf.... And parallel venation 1 originand develops from the aerial parts of a leaf blade, e.g., guava jack! Whorled phyllotaxy can take heavy loads at info @ libretexts.org or check out our page... The most essential and types ) November 15, 2019 Sushil Humagain 0 of! Responsible for giving support and carrying water, and 1413739 on a common axis and they not! In originand develops from the plants feed themselves science Foundation support under numbers. Making the furniture, defence, etc Schefflera sp. growing point Pinnately compound,.
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