EXAM 2 - 1 Discuss the plant body including the root system...

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1) Discuss the plant body, including the root system and shoot system 2) Describe the ground tissue system (parenchyma tissue, collenchyma tissue, and sclerenchyma tissue) of plants 3) Outline the structure and function of the vascular tissue system (xylem and phloem) of plants 4) Describe the dermal tissue system (epidermis and periderm) of plants 5) Discuss what is meant by growth in plants and how it differs from growth in animals Distinguish between primary and secondary growth Root system generally underground obtains water and dissolved minerals for plant usually anchors the plant firmly Shoot system generally aerial obtains sunlight and carbon dioxide for plant Shoot system consists of a vertical stem bearing leaves (main organs of photosynthesis) flowers and fruits (reproductive structures) Buds (undeveloped embryonic shoots) develop on stems Although separate organs (roots, stems, and leaves) exist in the plant, many tissues are integrated throughout the plant body, providing continuity from organ to organ Three main tissue systems Dermal tissue Epidermal cells Vascular tissue Xylem: tracheids and vessel elements Phloem: sieve tube elements and companion cells Ground tissue Parenchyma Collenchyma Sclerenchyma All three types of tissue are found in every plant organ- roots, stems, and leaves GROUND TISSUE SYSTEM All tissues of the plant body other than vascular tissues and dermal tissues VASCULAR TISSUE SYSTEM Tissue system that conducts materials throughout the plant body DERMAL TISSUE SYSTEM Tissue system that provides an outer covering for the plant body
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Ground Tissue System Parenchyma tissue Composed of living parenchyma cells with thin primary cell walls Play an important role in regeneration and wound healing due to retention of meristematic ability. In addition these abilities allow them to produce adventitious roots Functions include photosynthesis, storage, and secretion Parenchyma Cells with 1) plastids containing chlorophyll 2) plastids containing carotenoids 3) Vacuoles with anthocyanins Collenchyma tissue Composed of collenchyma cells ( from the Greek word kolla, meaning “glue”) with unevenly thickened primary cell walls with the carbohydrate pectin Provides flexible structural support like an athlete’s knee brace Stimulation of collenchyma occurs due to mechanical stress such as wind and rain resulting in more support for plant organs Sclerenchyma tissue -2 types- Sclereids and Fibers Composed of sclerenchyma (from the Greek word skleros, meaning “hard”) cells with both primary and secondary cell walls Sclerenchyma cells are often dead at maturity, but provide structural support Sclereids-Found throughout plant body-roots, stems, leaves, seed coats and even in the hulls of peanuts Fibers- Long, slender cells often associated with the vascular tissue Includes-Manila Hemp, Sisal Hemp, Marijuana, Flax, Ramie, Jute
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EXAM 2 - 1 Discuss the plant body including the root system...

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