Leaves produced are progressively shorter, narrow, and brittle in texture; these bunch together at the top and hence provide the name of … The upper leaflets of Pisum sativum get modified into tendrils. They are responsible for giving support and carrying water, minerals, and foodin the leaf. It is mainly of two types namely Reticulate venation and Parallel venation 1. We know leaves are specialised to perform photosynthesis. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. 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 *. In a compound leaf, the midrib of the leaf is branched into different leaflets and is connected by a single petiole. The leaflets are borne on a common axis and they do not bear any axillary buds in their axils. Compound leaves: The lamina is dissected upto midrib or upto tip of the petiole to form many leaflets. Pinnately-compound leaves have their leaflets arranged along the middle vein. 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. The leaflets of palmately-compound leaves radiate outwards from the end of the petiole. It develops laterally at the node. Fig. They convert carbon dioxide, water and sunlight into glucose and energy. The small bud-like structures at the base of the leaf are the stipules. Each leaf typically has a leaf blade called the lamina, which is also the widest part of the leaf. 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. Compound leaf: Here the lamina is divided in to a number of leaf like lobes called the leaflets. There are two different types of leaves – simple and compound leaves. 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. 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. Primarily, leaves have two functions: photosynthesis and transpiration. They also reduce water loss due to transpiration. (iii) Generally there is always an axillary budin the axil of a leaf. Veins can be observed as lines running on the surface of the leaf. 1. Some leaves are attached to the plant stem by a petiole. 18: Shape of the leaf. Leaves are, however, quite… Read More A compound leaf is a leaf made up of two or more leaflets. High pressure laminates are extremely durable and can take heavy loads. Ovate Type: They are oval or egg-shaped in their structure. How are the veins of the leaves important? The silk tree (Albizia) is an example of a plant with bipinnate leaves. In simple leaves, the lamina is continuous. Few of the modifications are mentioned below: The leaves perform the following functions: Photosynthesis is the primary function of leaves. 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. Plants show three types of phyllotaxy- alternate, opposite and whorled types of phyllotaxy. (i) The leaf is a lateral dissimilar appendage of the stem. A simple leaf may be incised to any depth but not down to the midrib or petiole. The base of a leaf is the lower part of the lamina, where it is attached to the petiole or stem. The other types of leaves include acicular, linear, lanceolate, orbicular, elliptical, oblique, centric cordate, etc. This modification helps the plant to resist desiccation. Legal. Some leaves are modified into spines to protect them from being damaged or eaten by animals. Leaves may be simple or compound. Few plants require nitrogen for their development. 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. There is, usually, a middle prominent vein, which is known as the midrib. Leaf Definition. Green leaves of the plant are collectively cold foliage leaves. The spines act as defensive structures. Leaves may be simple or compound. In addition, they also have other significant roles to play, such as support, storage of food, defence, etc. Elliptical: An ellipse-shaped leaf, e.g., guava, jack, etc. 01. Wilting is the drying out, withering and drooping of leaves of a plant due to insufficient water supply, excessive transpiration or some vascular disease. Simple leaf with palmately lobed lamina is found in Ricinus, Passiflora, Cucurbita, Carica, Gossypium. Transpiration is the removal of excess water from the plants into the atmosphere. Eg., Bignonia unguiscati. The pinnules on one secondary vein are called “pinna”. In some plants, the petiole becomes flattened, taking the shape of a leaf and turns green in colour. Some tree species make things more interesting by displaying more than one type of leaf … 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. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. In a compound leaf, the leaf blade is divided, forming leaflets that are attached to the middle vein, but have their own stalks. Some are modified into tendrils to provide support to the plant. They are commonly fixed by carpenters over plywood and MDF while making the furniture. Leaf Its Characteristics Functions Types Of Venation Vein Density As A Function Of Lamina Position For Leaves Growing At The Scientific Diagram types of leaf based on leaf lamina. (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: … They are modified in the form of spines, tendrils, hooks and scales and help them to adapt to various environments. Leaf location According to location leaf have following types 1. 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. Figure \(\PageIndex{1}\): Simple and compound leaves: Leaves may be simple or compound. The leaf is a flattened lateral out-growth of the stem/ branch and bears a … 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. The succulent and thick leaves particularly adapt to water storage. Structure of leaf (1) A leaf consists mainly of two parts lamina … E.g. The leaf shape may also be formed of lobes where the gaps between lobes do not reach to the main vein. 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. (v) The growth of leaf is limited. Compound leaves contains axillary buds. Biology Morphology of Flowering Plants part 13 (Leaf: parts-lamina, Petiole, Stipule) CBSE class 11 XI Different plants show different types of venation. Some leaves are thick that help in water storage. Simple leaf and compound leaf are two types of leaves that occur in dicots. ‘ Eg., Salvinia. (iv) It is exogenous in originand develops from the swollen leaf primordium of the growing apex. Leaf. Pinnately compound leaves Eg., Silk cotton. The term leaf refers to the organ that forms the main lateral appendage on the stem of vascular plants. Let’s learn more about the morphology of leaves, parts of a leaf, different types of leaves and their modifications. Radical present near the roots 2. The leaves get modified into thread-like structures called tendrils. 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 lamina, or the leaf blade or epipodium is the green expanded part of the leaf with veins and veinlets. Bipinnately-compound (double-compound) leaves have their leaflets arranged along a secondary vein, which is one of several veins branching off the middle vein. For eg., In Lathyrus aphaca, the whole leaf is modified into tendrils. This occurs by the opening of stomata present in the leaves. Types of Leaf Forms. These shapes range from oval, elliptical and linear, to truncate and lanceolate. ... Types of Leaf Forms. Not every species produces leaves with all of these structural parts. A typical plant leaf (Different parts and types) November 15, 2019 Sushil Humagain 0. When a single lamina is connected to the main stem by a petiole, the leaf is said to be simple. Leaf anatomy. Leaves are a site of photosynthesis. This is known as phyllode. A, acicular; B, linear; C. lanceolate; D, elliptical or oval, E, ovate; F, oblong; G, rotund or orbicular; H, cordate; I, … There are two different types of leaves – simples leaves and compound leaves. Leaf Form. Your email address will not be published. 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. The leaf is a thin, broad, flat and green part of a plant which is attached to the stem or branch. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. Watch the recordings here on Youtube! They protect the auxiliary bud present in their axil. Compound Leaf. What are the different types of blade of a leaf? Thank You! A plant has large number of leaves. Oblique Type: The lamina of this leaf has unequal halves. For eg., Australian Acacia. Simple leaves are lobed or divided but do not form distinct leaflets. In leaf: Leaf morphology …a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole. Your email address will not be published. (B) Linear-When the leaf blade is long, narrow and flat i.e. In such plants, the leaves are modified to catch and digest insects. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. There are various types of leaves, each with its own shapes. Photosynthesis is the major function performed by 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. Pinus sp. are different modified leaves. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. Cauline leaves arise from main stem only 3. For each of these functions, they have been modified into different forms. Among the different parts of a plant, the leaf is the most essential. Leaf location 47. New leaves emerging from the infected plants are narrower with wavy leaf lamina and yellow leaf margins (Nelson, 2004). 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 some plants, it takes up the responsibility of reproduction also. Simple – A life with undivided lamina is known as simple leaf. The patterns of arrangement of leaves on the stem are called Phyllotaxy. Scale leaves in onion are fleshy and thick and store food and water. Spatulate Type: They have shapes resembling spatulas or spoons. ’ s learn more about the morphology of leaves and their modifications e.g., lotus, nasturtium. Lobed or divided but do not form distinct leaflets and each leaflet has a leaf made up two... 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