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The Root: Regions and Functions (With Diagram) Article Shared by ADVERTISEMENTS: In this article, we propose to discuss about the various regions and functions of the root. The root is the descending portion of the plant axis. As opposed to the stem, it is positively geotropic, negatively phototropic and positively hydrotropic.
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These include providing structure, supporting the leaves, buds, and flowers. Additionally, the stem will aid in orienting the leaves to maximize photosynthesis. Stems are composed of nodes, points at which leaves and branches attach, and internodes, the regions of stem between the nodes. The petiole is a stalk that anchors each leaf at the node.
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Tap root system Fibrous roots are bushy roots seen mostly in monocotyledons like rice and wheat. Taproots are large central roots from which small lateral roots sprout out. These are primarily seen in dicotyledons like carrots and radish. Adventitious roots originate from branches, stems and leaves.
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This area of meristematic activity is called the zone of division. Figure 7.3.1 7.3. 1: Zone of division. As you move up in the root, the cells begin to get larger, developing into primary tissues. This region is called the zone of elongation. Figure 7.3.2 7.3. 2: Zone of elongation.
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Root Systems. There are two basic types of root systems in plants: taproot systems and fibrous rootsystems. Both are illustrated in Figure below.. Taproot systems feature a single, thick primary root, called the taproot, with smaller secondary roots growing out from the sides.The taproot may penetrate as many as 60 meters (almost 200 feet) below the ground surface.
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The root structure usually includes a root cap that protects the root as it grows, and root hairs sprout from the main roots epidermis, or outer "skin" layer, which aid in the acquisition of water.
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ROOT ANATOMY: DICOT ROOT CROSS SECTION Dicot Root Diagram Reveals Internal Structure of Dicot Root. A thin transverse section of the young dicot root of Gram, Sunflower or Pea reveals the following structures under the microscope: 1. Epiblema or Piliferous Layer. This is the outermost layer of root-derived from the protoderm of the apical meristem.
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The root is the descending part of the plant axis, which lies inside the soil. It contains the following parts like Root cap Root Hair Zone of elongation (region of elongation) Zone of maturation (region of maturation) The root typically does not contain chlorophyll, and therefore, it is nongreen.
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When examining a diagram of the root system, one can observe its hierarchical organization. The primary root, or the first root to emerge from the seed, is the main axis from which all other roots branch. Secondary roots sprout laterally from the primary root, forming a network of roots that reach out in various directions.
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Parts of a Root 1) The Region of Root Cap The tip of the root is protected by a multi-cellular (more than one cell) structure called root cap. The cells of the root cap are always in a state of division, thus constantly renewing and growing in number as the root penetrates the soil. Functions Carrying water and minerals from the soil
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Internal Structure of Root (With Diagrams) Article Shared by ADVERTISEMENTS: The below mentioned article provides an outline of the internal structure of root. The root develops from the radicle of the embryo.
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For instance, the anatomy of the root system reveals its various roles in storage, anchorage, and the acquisition and transport of nutrients and water. Because of this, the study of anatomy has much to tell us about the physiology of plants. Plant anatomy and morphology are critical components of nutrient acquisition and transport.
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Do Check: Tap Root Diagram Fibrous Root System Fibrous roots, on the other hand, are bushy roots in which thin, moderately branching roots grow from the stem. Rice, wheat, maize, marigold, banana and all monocotyledons are some examples of the fibrous root system. Also Read: Anatomy of Monocot and Dicot Plants
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Most of the root is composed of cortex tissue, and the endodermis, the innermost layer of the cortex, borders the stele. The outer layer of the root (external to the cortex) is the epidermis. Figure 3.2.3. 4: Eudicot root cross section. From center out, the xylem (in red) make an X, and the side tissues (green) make up the phloem..
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Taproots. Figure 11.3.1 11.3. 1: The carrot vegetable we eat is the taproot of a carrot plant. The large, central root (what we call a carrot) is a taproot and has many much smaller lateral roots that emerge from the sides. These are not root hairs, which would appear more like a microscopic fuzz at the ends of these lateral roots.
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There are three different types of root structure. A taproot, characteristic of dicots, is a single dominant root from which smaller, secondary roots extend. In a fibrous root system, composed of many small roots, no single root dominates. Taproots stretch deep into the soil, while fibrous roots spread out close to the surface.