Leaf with expanded bases surrounding stem, e.g., Calotropis. Cordate or heart-shaped, it is broad at the base but forms two equal lobes due to the formation of a deep notch, as in betel vine (Fig. In pairs at right angles to one another, e.g., Calotropis. These modified petioles are called phyllodes (Fig. These are rather prominent stipules which protect the terminal bud when young. We’ve got free leaf worksheets that allow your child to learn the various parts of a leaf, write leaf anatomy with leaf journaling pages, creatively color a leaf, and fine-tune their fine motor skills with cut and paste label a leaf pages! Leaf base 2. Clasping or surrounding the stem, as base of leaf, e.g., Sonchus. Bearing fine hairs on the margin, e.g., Cleome viscosa. It exposes the leaf lamina to proper light and air, and also conducts water from the stem to the leaf blade and elaborated food matters from the leaf to the stem. pipul, mango. Leaf modifications. TOS4. Normally the petiole lies in the same plane with the lamina, but in some leaves like those of the lotus, castor, etc., the petiole is attached at the back more or less at right angles to the blade. (With Methods)| Industrial Microbiology, How is Cheese Made Step by Step: Principles, Production and Process, Enzyme Production and Purification: Extraction & Separation Methods | Industrial Microbiology, Fermentation of Olives: Process, Control, Problems, Abnormalities and Developments, The best answers are voted up and rise to the top. 63, 8). An accounts of the more common forms of lamina is given (fig 66): 1. If there is only one prominent rib, i.e. Parts of a Leaf 3. Leaf-blades differ from one another in several ways: (1) the types of edges, (2) the patterns of the veins, and (3) the number of blades per leaf. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. (f) Tendrillar, as in Gloriosa (B. Ulat chandal). Disclaimer Copyright, Share Your Knowledge It is characterized by green color, thinness, and smoothness. This is the stalk which might fix the leaf to the stem; some leaves connect directly and don’t have petioles. These are some examples of leaf adaptations: The leaf shown above is an example of a leaf from a dicotyledon; a plant which has two ‘seed’ leaves. 63, 7). Firstly the veins (including the midrib) run along the length of the leaf and are parallel to each other, rather than in a spreading network of veins originating from a midrib. The following points highlight the three main parts of a leaf. Share Your Word File The Blade, or lamina, is the broad, flat part of the leaf. After your child studies the part of a leaf diagram, test his or her skills with a fill in the blank set for 9 parts of leaf anatomy. almond, jack fruit leaf (Fig. From the midvein originates veins and vein inlets. Cuticle – A waxy protective coating on the leaf epidermis that prevents water loss on leaves, green stems, and fruits. What are the modifications that are observed in birds that help them fly? (f) spiny, having spiny projections, as in Mexican poppy (B. Shialkantha). Let us learn about Diversity in the Leaf. System or disposition of veins in the leaves. What are the different sources of air pollution? Hairs – leaves which have adapted to become hairy generally originate from hot climates where the hairs help to reduce the amount of moisture lost by maintaining higher humidity levels around the leaf surface. The answer is because the different parts of a leaf will grow a little differently on each plant. The Leaf-Base 2. Types. The Lamina. Compound palmate leaf with four leaflets arising at a common point, e.g., Marsilea (a pteridophyte).

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