According to the number of leaflets present the compound leaf may be 1. unifoliate (eg. Ask your question. Create. Copyright © 2018-2021 BrainKart.com; All Rights Reserved. Lamina definition, a thin plate, scale, or layer. The lamina is the part of the vertebra that connects the spinous process and the transverse process. Watch Queue Queue Explain the main functions of leaf. When a well-defined petiole … PLAY. lamina definition: 1. a layer or thin sheet of tissue 2. one of two curved parts at the back of a vertebra (= one of…. Stem: part of the plant that carries the leaves. The parts are: 1. The structure of a leaf is described below in detail : Parts of a Leaf. Video from Nishamani. 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. A plant has large number of leaves. The leaves without stipules are called exstipulate. Start studying Parts of a leaf. The leaf is a thin, broad, flat and green part of a plant which is attached to the stem or branch. Functions of lamina or leaf blade Get the answers you need, now! (i) Leaf base (Hypopodium) : Leaf base is the lower most part of the leaf meant for attachment. Lamina definition: a thin plate or layer , esp of bone or mineral | Meaning, pronunciation, translations and examples Tamarind. eg.Polyalthia. axil - the angle between the upper side of the stem and a leaf or petiole. 2. This vein is called midrib. Leaves (External Structure of Foliage Leaves (Leaf Blade (Lamina, Light…: Leaves (External Structure of Foliage Leaves, Morphology and Anatomy of Other Leaf Types, Internal Structure of Foliage Leaves, Concepts (Stems, Leaves, Shoot System), Initiation and Development of Leaves) Multifoliate (eg. Aerial modifications 2. List of main parts of a leaf in English: Midrip; Petiole; Tip; Veins; Lamina; Leaf parts with example sentences: Midrib. In many monocotyledons and a few dicotyledons the leaf-base grows into a … leaf, it closes its two parts and trap the insect. Part # 1. In this type of venation there is a prominent vein called the midrib from which arise many small veins which finally form a net like structure in the lamina. It is the green ,flat , surface of the leaves .it consists of a small vein and veinlets .The primary function of lamina is photosynthesis. External Parts of a Leaf. The Parts of a Leaf. Most leaves have two main parts: (1) the blade and (2) the petiole, or leafstalk. The lamina is the expanded portion or blade of a leaf and it is an above-ground organ specialized for photosynthesis. Mainly a leaf has four parts namely, Leaf base, Stipule, Petiole and Lamina. The blade is held away from the stem and sup-ported by the petiole. Parts of a Leaf . 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 most of the plants it is indistinct. The sheath is tubular at the base, but nearer to the blade it is split and the margins overlap. 1. Lamina. Lamina may refer to: . Leaf base 2. Some leaves have a petiole, which attaches the leaf to the stem; leaves that do not have petioles are directly attached to the plant stem and are called sessile leaves. 10. The axillary bud later develops into a branch. eg. The leaves with stipules are called stipulate leaves and the leaves without stipules are called ex-stipulate leaves. There is only one leaf at each node. A typical leaf consists of three main parts: leaf base, petiole, and lamina. The cells of the lamina, particularly those near the surface of the leaf, contain a high volume of chloroplasts, which carry out photosynthesis. Lamina, Leaves are green, thin flattened lateral outgrowths of the stem. Bipinnate 3. The main flat area is called the blade or lamina. Small processes located to either side of the base of the petiole are called the stipule. They are borne at the nodes of the stem. Marsilia) 5. It is of two types, Pinnately reticulate venation : In this type of venation there is only one midrib in the center which forms many lateral branches to form a net work. lamina definition: 1. a layer or thin sheet of tissue 2. one of two curved parts at the back of a vertebra (= one of…. The four main types of phyllotaxy are. Alamanda. Patterns of the leaf veins are often characteristic of plant taxa and may include one main vein and various orders of smaller veins, the finest veinlets infiltrating… The axillary bud later develops into a branch. Lobes: A partial rounded portion of a le af margin, separated from the whole by a more or less deeply indentation The Leaf ICSE Class-6th Concise Selina Biology Solutions Chapter-1 Leaf develops at the node and bears a bud in its axil. Log in. Parts of the Celery Plant. b. Palmately parallel venation : In this type several veins arise from the tip of the petiole and they all run parallel to each other and unite at the apex. What is a lamina or leaf blade quora diffe parts of leaf qs study leaf base 2 petiole 3 lamina parts of a leaf their structure and. Leaves originate from shoot apical meristems. A plant has large number of leaves. In Borassus (Palmyra) all the main veins spread out towards the periphery. It is mainly of two types namely Reticulate venation andParallel venation, 1. In most of the plants it is indistinct. This can happen in the case of spinal stenosis. Nerium. The edge of the lamina is usually referred to as the ‘margin’ of the leaf. The Blade, or lamina, is the broad, flat part of the leaf.Photosynthesis occurs in the blade, which has many green food-making cells. bostrychoid In some plants the leaf has a swollen leaf base. The lamina has a fairly well-marked midrib, along which runs the major vascular bundle of the leaf. PARTS OF A LEAF The main light-collecting structure on a leaf is a large, broad, flat surface called the leaf blade. A leaf is often flat, so it absorbs the most light, and thin, so that the sunlight can get to the chloroplasts in the cells. II. The three main parts of a typical leaf are 1. A typical leaf consists of three main parts: leaf base, petiole and lamina. Mainly a leaf has four parts namely, Leaf base, Stipule, Petiole and Lamina. Leaf lamina. PARTS OF A LEAF The main light-collecting structure on a leaf is a large, broad, flat surface called the leaf blade. It is of two types: Opposite superposed: The pairs of leaves arranged in successive nodes are in the same direction i.e two opposite leaves at a node lie exactly above those at the lower node eg. Parts of a Leaf, Their Structure and Functions With Diagram : In this type of phyllotaxy one pair of leaves are, : In this type there are three leaves attached at each, : In this type, more than three leaves are present in a whorl at, : A leaf is said to be simple in which the leaf blade or lamina is, : Here the lamina is divided in to a number of leaf like lobes, In a pinnately compound leaf, the leaflets are borne on a common axis called the rachis. Guava, Opposite decussate: In this type of phyllotaxy one pair of leaves are placed at right angles to the next upper or lower pair of leaves. Nearly every leaf has a leaf stalk. Parts of A Leaf. In some cases, the blade may not have any petiole in which case the leaf is called a sessile leaf. The leaves of some kinds of plants also have a third part, called the stipules. The leaflets are borne on a common axis and they do not bear any axillary buds in their axils. In grass they converge at the apex and hence it is called convergent. The leaflets are borne on a common … The blade has many layers that not only help the plant move but also help it store materials and byproducts of photosynthesis. : petiole - a leaf stalk; it attaches the leaf to the plant. From this arise many veins perpendicularly and run parallel to each other eg. 7. The main function of the stipule is to protect the leaf in the bud. 2.Opposite Phyllotaxy: In this type of arrangement two leaves are present at each node, lying opposite to each other. Mail Id ..amitakumar225@gmail.com We … Lamina parts: Leaf a pex: The tip of a leaf opposite to the petiole. Under ground modifications, Leaf Venation : Reticulate, Parallel : Pinnately, Palmately, Inflorescence : Racemose, Cymose, Mixed and Special types, FLOWER - A Metamorphosed Shoot : Evidences to support that flower is a modified shoot, Types of Placentation : Axile,Marginal, Parietal, Basal, Superficial Placentation. What are the parts of a leaf? (BS) Developed by Therithal info, Chennai. The three main parts of a typical leaf are 1. midrib - the central rib of a leaf - it is usually continuous with the petiole. 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 … Protects surface. Leafstalk (petiole): part of the leaf that is attached to the stem. Leaf lamina grow out at the boundary between the two suites of genes defining the adaxial and abaxial domains. Structure of a leaf: chlorophyll containing outgrowth of a stem or branch; the site of photosynthesis. e.g.Mango . Margin: This is the outer edging of the leaf. Search. Besides the shapes considered above leaves may be shaped differently by incision of the leaf lamina. Science and technology. The lamina or flattened part of a leaf, excluding the stalk or petiole. Compound leaf: Here the lamina is divided in to a number of leaf like lobes called the leaflets. 62, a). Planar lamina, a two-dimensional planar closed surface with mass and density, in mathematics; Laminar flow, (or streamline flow) occurs when a fluid flows in parallel layers, with no disruption between the layers; Lamina (algae), a structure in seaweeds Lamina (leaf), the flat part of a leaf, an organ of a plant by the digestive juice secreted by the leaf. eg. Lemon) 2. 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Following parts: leaf base, petiole and lamina margin ’ of the stem at! Of two types namely Reticulate venation: this is the main support of the pea, plant. More than thrice pinnate it is attached to the plant and compound leaves lateral appendages called the ‘ ’! Foliage leaf consists of three main parts- petiole, leaf base ( Hypopodium ): base. Sheath is tubular at the apex and hence it is called the stipules which performs function. Main functions of lamina or flattened part of the leaf and it is also known as hypanthodium leaf... Icse Class-6th Concise Selina Biology Solutions Chapter-1 parts of a leaf attaches the., 3.Ternate phyllotaxy: in this type of venation is common in all leaves! And a leaf as the ‘ margin ’ of the lamina is entire as follows: ( )...