The leaf is a thin, broad, flat and green part of a plant which is attached to the stem or branch. 6. Sub aerial modifications 3. They are borne at the nodes of the stem. Leaf base-The basal part of the leaf by which it is attached to the stem at the node is called 'leaf base'. 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 … The blade has many layers that not only help the plant move but also help it store materials and byproducts of photosynthesis. are in the same direction i.e two opposite leaves at a node lie exactly above those at the lower node eg. They are borne at the nodes of the stem. Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail, Parts of a Leaf : 1. 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. Base of the leaf stalk. The base of a leaf is the lower part of the lamina, where it is attached to the petiole or stem. lamina - the blade of a leaf. Join now. The pinnately compound leaf may be of the type 1. 149,721,946 stock photos online. When a well-defined petiole … Let us study each of them. They can be in many different forms, i.e. Lamina parts: Leaf a pex: The tip of a leaf opposite to the petiole. Functions of lamina or leaf blade Get the answers you need, now! The lamina or flattened part of a leaf, excluding the stalk or petiole. Log in Sign up. Leaf areas of the new flush leaves were calculated from the equation computed for cocoa leaves by Reynolds (1971): log y =-0-632 + 1 987logX, where Y is the leaf area and X the length of the leaf lamina along the mid-rib. The Leaf-Base 2. It is easily removed by rubbing. The leaf is attached to the stem by the leaf base (hypo-podium) and may bear two lateral small leaf-like structures called stipules. Lamina may refer to: . The lamina has a fairly well-marked midrib, along which runs the major vascular bundle of the leaf. Leaf Base: This is the part where a leaf attaches to the stem. Most leaves have stomata, which open and close.They regulate carbon dioxide, oxygen, and water vapour exchange with the atmosphere. In most of the plants it is indistinct. Log in. Vein: line dividing, but not completely, the leaf into sections. Leaf base 2. : 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. The Lamina. It is of two types. The other types of leaves include acicular, linear, lanceolate, orbicular, elliptical, oblique, centric cordate, etc. Science and technology. Parts of A Leaf. (i) Leaf base (Hypopodium) : Leaf base is the lower most part of the leaf meant for attachment. Tamarind. Leaf base has two small leaf-like structure called stipules. The three main parts of a typical leaf are 1. Base: The base of the lamina is often notched and the two lobes of the lamina are extended downwards. The leaves with stipules are called stipulate leaves and the leaves without stipules are called ex-stipulate leaves. JayBhagat705 JayBhagat705 11.09.2020 Biology Secondary School Unipinnate 2. Learn more. A typical leaf consists of three main parts: leaf base, petiole and lamina. Lamina or Leaf blade- Is the green flat and broad part 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. The leaves of some kinds of plants also have a third part, called the stipules. 1. It may be with incision or without incision. 2. The insect then digested. Besides the shapes considered above leaves may be shaped differently by incision of the leaf lamina. The leaves without stipules are called exstipulate. 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 leaf: Leaf morphology …a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole. Trifoliate (eg. In most of the plants it is indistinct. 2.Bipinnate: In this type of compound leaves, the primary rachis is branched to produce secondary rachis which bear the leaflets. The petiole and the blade of the leaves are usually distinctly different. Leaf apex: The tip of a leaf opposite to the petiole M idrib The the central vein of a leaf it is usually continuous with the petiole. Margins: The boundary area extending along the edge of the leaf. Petiole 3. Leaves of different plants have different shapes and sizes, but all of them have same basic structure. a. Pinnateley Parallel venation : In this type, there is a prominent midrib in the centre. Log in. Leafstalk (petiole): part of the leaf that is attached to the stem. 1.Alternate phyllotaxy: In this type the leaves are arranged alternatively in the nodes. Structure of leaf (1) A leaf consists mainly of two parts lamina … Suchswollen leaf bases are called pulvinate leaf bases as seen in mango leaves. There is only one leaf at each node. eg. A leaf consists of three main parts- petiole, leaf base and lamina. Compound leaf: Here the lamina is divided in to a number of leaf like lobes called the leaflets. There are two laminae, located on either side of the spinous process. Margin: This is the outer edging of the leaf. Generally, leaf base, petiole, and lamina, together form the main parts of a leaf. The Leaf ICSE Class-6th Concise Selina Biology Solutions Chapter-1 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. Petiole 3. In some plants the leaf has a swollen leaf base. axil - the angle between the upper side of the stem and a leaf or petiole. It is the green ,flat , surface of the leaves .it consists of a small vein and veinlets .The primary function of lamina is photosynthesis.Mail Id ..amitakumar225@gmail.comWe all ready know due this pandemic corona virus disease all children can't go to school this science facts educational channel included chapter wise topic.and contains very interesting facts mix with knowledge. Define: (i) Photosynthesis (ii) Transpiration. The edge of the lamina is usually referred to as the ‘margin’ of the leaf. The blade is held away from the stem and sup-ported by the petiole. Leaves are the chief organs of. Mail Id ..amitakumar225@gmail.com We … Stipules. In grass they converge at the apex and hence it is called convergent. bostrychoid Leaves are the chief organs of photosynthesis. The leaf consists of three parts namely, leaf base (usually provided with a pair of stipules), petiole and leaf blade or lamina. If the leaf is sessile, those two lobes may surround the stem like two flaps or ears and then the base is termed auriculate. Lamina: The expanded portion or blade of a leaf. In some leaves there is no stipule for example. Petiole- It is also known as the leaf stalk. The lamina contains following parts: (i) Veins: There are various types of lines on the leaf. Midrib: line dividing the leaf in two. Structure of a leaf: chlorophyll containing outgrowth of a stem or branch; the site of photosynthesis. 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… (BS) Developed by Therithal info, Chennai. 1.Unipinnate: In this type the pinnae are borne directly on the rachis. As a customer focused, world-class supplier of choice, we provide the brands, product breadth, distribution network and technical support for all your metal forming needs. A typical leaf consists of three main parts: leaf base, petiole and lamina. Phyllotaxy: The arrangement of leaves on the stem or the branches is known as phyllotaxy. Stem: part of the plant that carries the leaves. The Petiole 3. The lamina of the leaf contains veins and veinlets that provide rigidity to the leaf … Within each leaf, the vascular tissue forms veins. 6 terms. Structure of leaf (1) A leaf consists mainly of two parts lamina … Learn vocabulary, terms, and more with flashcards, games, and other study tools. A typical leaf of two main parts: an expanded blade or lamina, and a stalk called the petiole, by which the leaf is attached to the stem. New users enjoy 60% OFF. Long thin flexible petioles allow leaf blades to flutter in wind, thereby cooling the leaf and bringing fresh air to leaf surface. Compare canopy. Copyright © 2018-2021 BrainKart.com; All Rights Reserved. Bifoliate (eg.Zornia diphylla) 3. Leaves are collectively referred to as foliage, as in "autumn foliage". Leaf base 2. It is the expanded portion or blade of a leaf which is well adapted to absorb sunlight and carbon dioxide for photosynthesis. Is also known as the leaf spinal nerve roots no stipule for example the! Leaf base-The basal part of the pea, sensitive plant, mango have swollen leaf-bases in of... A node lie exactly above those at the node is called convergent tertiary rachis which bear the are... Layers that not only help the plant are collectively referred to as the leaf Download 41 lamina! 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