According to the number of leaflets present the compound leaf may be 1. According to the number of leaflets present the compound leaf may be 1. unifoliate (eg. Leaf Base: This is the part where a leaf attaches to the stem. It acts as a leaf cushion. The petiole help hold the blade to light. In Borassus (Palmyra) all the main veins spread out towards the periphery. The base of a leaf is the lower part of the lamina, where it is attached to the petiole or stem. Leaf lamina grow out at the boundary between the two suites of genes defining the adaxial and abaxial domains. Leaf develops at the node and bears a bud in its axil. A typical leaf consists of three main parts: leaf base, petiole, and lamina. The leaves with stipules are called stipulate leaves and the leaves without stipules are called ex-stipulate leaves. Leaf base- It is the part of the leaf in contact with the stem at the node. From this arise many veins perpendicularly and run parallel to each other eg. The Petiole 3. Within each leaf, the vascular tissue forms veins. This is the main portion of the leaf, also called the ‘blade’. Bombax). firee5. Palmately compound leaves, In a pinnately compound leaf, the leaflets are borne on a common axis called the rachis. The leaflets are known as the, : In this type of compound leaves, the primary rachis is branched, : In this type the secondary rachis produces the tertiary rachis, : When the compound leaf is more than thrice pinnate it is. The leaves of some kinds of plants also have a third part, called the stipules.. The leaf is a thin, broad, flat and green part of a plant which is attached to the stem or branch. Tip. The purpose of phyllotaxy is to avoid overcrowding of leaves so as to expose the leaves maximum to the sunlight for photosynthesis. Join now. A leaf is an above-ground plant organ and it is green. Define: (i) Photosynthesis (ii) Transpiration. (i) Leaf base (Hypopodium) : Leaf base is the lower most part of the leaf meant for attachment. Simple Leaf: A leaf is said to be simple in which the leaf blade or lamina is entire. Reticulate Venation: This type of venation is common in all dicot leaves. Log in Sign up. The leaves without stipules are called exstipulate. bloom A fine white or bluish waxy powder occurring on plant parts, usually stems, leaves, and fruits. Simple Leaf: A leaf is said to be simple in which the leaf blade or lamina is entire. Explain the main functions of leaf. Leaf base 2. The petiole part of the leaf is also called as mesopodium. In monocots the leaf base is very broad and flat and it clasps a part of the node of the stem … When a well-defined petiole … It may be with incision or without incision. Leaves are green, thin flattened lateral outgrowths of the stem. There are two different types of leaves – simples leaves and compound leaves. 62, a). Protects surface. Its main functions are photosynthesis and gas exchange. 7. Marsilia) 5. by the digestive juice secreted by the leaf. The Parts of a Leaf. Photosynthesis occurs in the blade, which has many green food-making cells. Leaf base-The basal part of the leaf by which it is attached to the stem at the node is called 'leaf base'. Parts of a leaf: A leaf may seem simple in appearance, but it is a highly-efficient structure. 4. 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. Compare canopy. Learn more. A leaf has following parts: - 1. The green leaves of the plant are collectively called as foliage of the plant. Leaves are collectively referred to as foliage, as in "autumn foliage". 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. The leaves of some kinds of plants also have a third part, called the stipules. Unipinnate 2. Margins: The boundary area extending along the edge of the leaf. 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. Leaves are the chief organs of photosynthesis. Small processes located to either side of the base of the petiole are called the stipule. Besides the shapes considered above leaves may be shaped differently by incision of the leaf lamina. Lamina definition: a thin plate or layer , esp of bone or mineral | Meaning, pronunciation, translations and examples The Leaf-Base: It is by no means a conspicuous part of the leaf. 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 ..firstname.lastname@example.orgWe 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. Leaf base is also known as hypanthodium or leaf foundation or leaf cushion or leaf buttress. The lamina is often the site of back surgery when you need to relieve the symptoms caused by pressure on the spinal nerve roots. Mainly a leaf has four parts namely, Leaf base, Stipule, Petiole and Lamina. They are borne at the nodes of the stem. Leafstalk (petiole): part of the leaf that is attached to the stem. Leaves originate from shoot apical meristems. 2. PARTS OF A LEAF The main light-collecting structure on a leaf is a large, broad, flat surface called the leaf blade. Lamina definition, a thin plate, scale, or layer. Bifoliate (eg.Zornia diphylla) 3. 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. The blade has many layers that not only help the plant move but also help it store materials and byproducts of photosynthesis. The leaves with stipules are called stipulate leaves and the leaves without stipules are … Key Takeaways Key Points. Lamina/Blade: This is the blade of the leaf. The main function of the stipule is to protect the leaf in the bud. Check determinations of the leaf area showed that this relationship held for the plants being studied. Stipules. 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. Lamina may refer to: . 3. serrated, parted. Petiole. Compound leaf: Here the lamina is divided in to a number of leaf like lobes called the leaflets. External Parts of a Leaf. The green leaves of the plant are collectively called as foliage of the plant. In most of the plants it is indistinct. Mail Id ..email@example.com We … 6 terms. Mainly a leaf has four parts namely, Leaf base, Stipule, Petiole and Lamina. Lamina or Leaf blade- Is the green flat and broad part of the leaf. a. Pinnateley Parallel venation : In this type, there is a prominent midrib in the centre. Log in Sign up. The leaflets are borne on a common axis and they do not bear any axillary buds in their axils. Leaf Parts: Any of these parts may be lacking, modificate or reduced. Leaf base : The part of the leaf which is attached to the stem or a branch is called leaf base. Alamanda. Parallel Venation: In this type of venation all the veins run parallel to each other. The compound leaves of the family Fabaceae. It may be with incision or without incision. e.g.Mango . It is the expanded portion or blade of a leaf which is well adapted to absorb sunlight and carbon dioxide for photosynthesis. Start studying Parts of a leaf. https://www.toppr.com/guides/biology/anatomy-of-flowering-plants/leaf 2. Midrib: line dividing the leaf in two. Most leaves have stomata, which open and close.They regulate carbon dioxide, oxygen, and water vapour exchange with the atmosphere. 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 … It is normal that tobacco leaf blades cannot be separated from the stems in one round, so the process is repeated until the leaf blades are completely separated from the tobacco leafs. Leaf develops at the node and bears a bud in its axil. There are two laminae, located on either side of the spinous process. The leaf base is also called as hypopodium. The two main functions of leaf are photosynthesis and transpiration. In most of the plants it is indistinct. Sometimes leaf base shows different variations as follows : (a) Pulvinate leaf base : In members of leguminosae the leaf is swollen. : petiole - a leaf stalk; it attaches the leaf to the plant. Lobes: A partial rounded portion of a le af margin, separated from the whole by a more or less deeply indentation The axillary bud later develops into a branch. Leaves which have the stipules are called stipulate, : Petiole connects the lamina with the stem or the branch. 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. The lamina is the expanded portion or blade of a leaf and it is an above-ground organ specialized for photosynthesis. It is of two types. Join now. The lamina is the part of the vertebra that connects the spinous process and the transverse process. 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) 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. The leaf is attached to the stem by the leaf base (hypo-podium) and may bear two lateral small leaf-like structures called stipules. The lamina of the leaf contains veins and veinlets that provide rigidity to the leaf … Parts of the Celery Plant. The leaflets are known as the pinnae. 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