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Unformatted text preview: Plant Anatomy Lab # 4 Plant Anatomy Three Main Organs o The leaves o The stem o The root o Each organ is made up of one or more types of cells Types of Tissues o Simple tissue Those composed of a single type of cell o Complex tissue Those composed of two or more types of cells Three Main Tissue Systems o Dermal tissue system Consists of the tissue covering the body, i.e., the epidermis and, in plants that exhibit more extensive secondary (woody) growth, periderm Two dermal tissues: Both are complex tissues Epidermis o Can consist of epidermal cells, guard cells that surround stomata, and a number of other specialized cells Periderm o A complex tissue that includes, among other types of cell, cork o Vascular tissue system Consists of the conducting tissues of the plant, xylem and phloem Two major vascular tissues: Xylem o The major conducting tissue for water and mineral nutrients o A complex tissue that can consist of parenchyma cells, sclerenchyma cells, and the tracheary elements (the actual conducting cells) o The tracheary elements are either tracheids or vessel memebers Phloem o The major conduit responsible for the movement of photosynthate and other organic molecules throughout the plant o A complex tissue, and may consist of parenchyma cells, sclerenchyma cells, and the sieve element (the actual conducting cells) o The major sieve element in flowering plants is the sieve-tube member o Ground (or fundamental ) tissue system Consists of the remaining tissues in the plant Three ground tissues: All are simple tissues Parenchyma tissue o Composed of parenchyma cells o Most abundant type of cell in the plant body o Functions Photosynthesis Storage o Retain their ability to divide and differentiate, so they are also important in the healing of wounds or other damage o Cells are alive at maturity and have an evenly thickened cell wall Collenchyma tissue o Composed of collenchyma cells o Cell are also alive at maturity and are characterized by having unevenly thickened cell walls o Function Support, particularly for delicate tissues (such as flower petals) and parts that are still growing Sclerenchyma tissue o Composed of sclerenchyma cells o Cells are dead at maturity and are characterized by having a thick, lignified cell wall o Function Support Tissue System Tissue Tissue Type Cell Types Function(s) Ground (=Fundamental) Parenchyma Collenchyma Sclerenchyma Simple Simple Simple Parenchyma Collenchyma Sclerenchyma Photosynthesis, storage, many others Support Support Vascular Xylem Phloem Complex...
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- Spring '08