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Slideshow
Slideshow

... • Produce sugar from photosynthesis • Exchange of gases – carbon dioxide (in) and oxygen (out) ...
plant tissues - WordPress.com
plant tissues - WordPress.com

... • glucose produced can be converted into carbohydrates used as building blocks for plant’s structures and functions ...
AP Biology Plants Notes Barron`s
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Chapter Outline
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... ii. They are smaller and more generalized than sieve-tube members. iii. They have a nucleus which may control and maintain the function of both cells. iv. They are also thought to be involved in the transport function of phloem. 3. Vascular tissue extends from root to leaves as the vascular cylinder ...
Chapter 24 - Structure and Organization of Flowering Plants 24.1
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... f. Number of apertures in pollen usually one usually three grains 3. Representative members: grasses, lilies, orchids, dandelions to oak rice, wheat, corn trees and palm trees 4. The distinction between monocots and eudicots represents an important evolutionary division that relates to many structur ...
1 - contentextra
1 - contentextra

... Plants show indeterminate growth because of their meristematic tissue. Apical meristems occur at the tips of roots and stems and cause primary growth. Lateral meristems include vascular cambium and cork cambium and allow growth in thickness of plants. Meristematic tissue allows tropisms in plants. ...
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... Specialized Tissues In Plants Types of Plant Tissue • Dermal tissue – the tissue covering the outside of the plant body • Periderm – the part of the dermal tissue in plants that makes up the outer bark in trees and other woody plants • Epidermis – the outermost tissue layer • Cuticle – waxy, waterpr ...
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... At the center of the apical meristem in gymnosperms and angiosperms is a group of cells called the quiescent center. What do these cells do? • [A] sense the direction of the pull of gravity • [B] divide rapidly to produce new root tissue • [C] very little • [D] protect the growing root as it pushes ...
chapter 31 review sheet (more plant stuff)
chapter 31 review sheet (more plant stuff)

... • Air passes through the stomates, into the air spaces between the spongy layer cells and into the air spaces in the palisade layer where carbon dioxide is absorbed for photosynthesis. Oxygen diffuses from the palisade layer cells into the surrounding air spaces, into to the spongy layer air spaces ...
Plant Anatomy and Function
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... distinctive. This lab will focus on angiosperm anatomy, for which there are ~250,000 known species. Within angiosperms there are two main systems: root and shoot. The shoot system is further subdivided into two basic organs, stems and leaves. By definition, an organ consists of groups of tissues tha ...
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Root and Shoot Systems
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Meristem



A meristem is the tissue in most plants containing undifferentiated cells (meristematic cells), found in zones of the plant where growth can take place.Meristematic cells give rise to various organs of the plant and keep the plant growing. The shoot apical meristem (SAM) gives rise to organs like the leaves and flowers, while the root apical meristem (RAM) provides the meristematic cells for the future root growth. SAM and RAM cells divide rapidly and are considered indeterminate, in that they do not possess any defined end status. In that sense, the meristematic cells are frequently compared to the stem cells in animals, which have an analogous behavior and function.The term meristem was first used in 1858 by Karl Wilhelm von Nägeli (1817–1891) in his book Beiträge zur Wissenschaftlichen Botanik. It is derived from the Greek word merizein (μερίζειν), meaning to divide, in recognition of its inherent function.In general, differentiated plant cells cannot divide or produce cells of a different type. Therefore, cell division in the meristem is required to provide new cells for expansion and differentiation of tissues and initiation of new organs, providing the basic structure of the plant body.Meristematic cells are incompletely or not at all differentiated, and are capable of continued cellular division (youthful). Furthermore, the cells are small and protoplasm fills the cell completely. The vacuoles are extremely small. The cytoplasm does not contain differentiated plastids (chloroplasts or chromoplasts), although they are present in rudimentary form (proplastids). Meristematic cells are packed closely together without intercellular cavities. The cell wall is a very thin primary cell wall.Maintenance of the cells requires a balance between two antagonistic processes: organ initiation and stem cell population renewal.Apical meristems are the completely undifferentiated (indeterminate) meristems in a plant. These differentiate into three kinds of primary meristems. The primary meristems in turn produce the two secondary meristem types. These secondary meristems are also known as lateral meristems because they are involved in lateral growth.At the meristem summit, there is a small group of slowly dividing cells, which is commonly called the central zone. Cells of this zone have a stem cell function and are essential for meristem maintenance. The proliferation and growth rates at the meristem summit usually differ considerably from those at the periphery.Meristems also are induced in the roots of legumes such as soybean, Lotus japonicus, pea, and Medicago truncatula after infection with soil bacteria commonly called Rhizobium. Cells of the inner or outer cortex in the so-called ""window of nodulation"" just behind the developing root tip are induced to divide. The critical signal substance is the lipo-oligosaccharide Nod-factor, decorated with side groups to allow specificity of interaction. The Nod factor receptor proteins NFR1 and NFR5 were cloned from several legumes including Lotus japonicus, Medicago truncatula and soybean (Glycine max). Regulation of nodule meristems utilizes long distance regulation commonly called ""Autoregulation of Nodulation"" (AON). This process involves a leaf-vascular tissue located LRR receptor kinases (LjHAR1, GmNARK and MtSUNN), CLE peptide signalling, and KAPP interaction, similar to that seen in the CLV1,2,3 system. LjKLAVIER also exhibits a nodule regulation phenotype though it is not yet known how this relates to the other AON receptor kinases.
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