Label the structures discussed above. A row of palisade parenchyma occurs next to epidermis forming more or less a compact band. Printout Read the definitions then label the cross section of the leaf. They remain arranged in parallel series. They remain surrounded by parenchymatous bundle sheaths. All leaves have the same basic structure - a midrib, an edge, veins and a petiole. The upper epidermis posse­sses a number of conspicuous bulliform cells. The differentiation of tissues into epider­mal, ground and vascular is clear. Chloroplast consists of two layers an outer membrane and an inner membrane enclosing the inner membrane space. What are the internal parts of a leaf? What are the internal parts of a leaf? Q.1. Two or three layers of columnar cells with abundant chloroplasts remain arranged more or less at right angles to the upper epidermis. A row of palisade parenchyma occurs next to epidermis forming more or less a compact band. The bundles are collateral and closed ones which remain arranged in parallel series. Stomata occur on the lower epidermis. Reproduction in whole or in part without permission is prohibited. Also name them. Thus they do not possess two epidermal layers. The spongy cells occurring towards lower epidermis are isodiametric, and often irregular in shape, and have profuse intercellular spaces. Draw a neat, clear diagram of your specimen in the space below. Lithocysts are frequently present and well-developed calcium carbonate crystals, the cystoliths, occur here and there. 622A): The epidermis is uniseriate made of compactly-arranged tabular cells with cuti­cularised outer walls. Why mitochondria is called as the power house of the cell? It is differentiated into palisade and spongy cells. The bundles remain scattered in the lower part of the mesophyll. These distinctly differ from the mesophyll. Parts of a Leaf: A typical leaf of Ficus religiosa (pipal) has a broad thin, flat structure called the lamina. Below is a close diagram of the leaf structure: The basic structure of a leaf. Xylem, as usual, consists of tracheary elements, and phloem of sieve tubes and companion cells. Considerable deposition of silicon is a distinctive character. What are the external parts of a plant leaf? Structure of a Typical Leaf. But unlike other dorsiventral leaves, palisade cells occur here both towards upper and lower epidermis and spongy cells are located in between them. What structure is used to transport organic molecules from the leaf to other parts of the plant? The outer layer of upper multiple epidermis and the lower epidermis as a whole are made of compactly-arranged tabular cells with cutinised outer walls having cuticle. The upper epidermis is multiseriate, being made of a few layer of cells. Download Parts of Plants Cheat Sheet PDF. It is differentiated into palisade and spongy cells. The number of chlo­roplasts is naturally much smaller here in comparison to palisade cells. 614): There are two epidermal layers on adaxial and abaxial surfaces of the leaf. Once a student has given me their leaf part and function … A section through a leaf of datepalm (Phoenix sylvestris of family Palmae) would show the following structure (Fig. A big cavity is present in the central region. Plus you can even grab the clipart to design your own Fall leaf resources for your students. The lamina possesses a network of veins. 619): Both upper and lower epidermal layers are uniseriate and com­posed of more or less oval cells with cuticularised outer walls. Q.1. These leaves are acicular in shape and are more or less rounded in cross-section. A large vascular bundle practically resembles that of a stem. Answer Now and help others. Label a stoma and a guard cell. They are collateral and closed ones with xylem and phloem. The vascular tissue system is composed of vascular bundles which are usually collateral and closed. leaf apex - the outer end of a leaf; the end that is opposite the petiole. This row made of parenchy­ma cells is referred to as bundle sheath or border parenchyma. Some distinct cavities are present here and there. Petiole, leaf base, lamina, leaf apex, and leaf margin are the external parts of a leaf. Privacy Policy3. What is succus entericus? Ans. It is composed of more or less isodiametric cells with small inter­cellular spaces, thus the differentiation into palisade and spongy cells is absent. A few common isobilateral leaves have been selected for the study of internal structures. The ground tissue forming the mesophyll is differentiated into palisade and spongy cells. Most flowers have male and female parts that allow the flower to produce seeds. stem - (also called the axis) the main support of the plant. 3. Collectively, green leaves are called foliage. Epidermal layers are uniseriate both on the adaxial and abaxial sides. A transverse section would show the same plan of arrangement of tissues: It is uniseriate with tabular cells and a large number of epidermal outgrowths. Presence of conspicuous air spaces in the mesophyll is another marked feature. Petiole, leaf base, lamina, leaf apex, and leaf margin are the external parts of a leaf. Elongated sclerotic cells—the trichosclereids commonly called ‘internal hairs’, often with branched ends are frequently present. Ans. : petiole - a leaf stalk; it attaches the leaf to the plant. These layers protect the leaf from insects, bacteria, and other pests. These cells markedly differ from the mesophyll. Q.3. These are very much reduced. 622A): The epidermis is uniseriate made of compactly-arranged tabular cells with cuti­cularised outer walls. Function of Leaf. 15. Occurrence of stomata and outgrowths are distinctive features. 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