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The stem

The stem. Julia Guillen Tete Aguilar Gaby Rivas Moo Raymundo. The Stem. A stem is one of two main structural axes of a vascular plant. Stems ( gaby ). In most plants stems are located above the soil surface but some plants have underground stems

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The stem

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  1. Thestem Julia Guillen Tete Aguilar Gaby Rivas Moo Raymundo

  2. TheStem • A stem is one of two main structural axes of a vascular plant.

  3. Stems(gaby ) • In most plants stems are located above the soil surface but some plants have underground stems • A stem develops buds and shoots and usually grows above the ground. Inside the stem, materials move up and down the tissues of the transport system. • The term shoots is often confused with stems; shoots generally refer to new fresh plant growth and does include stems but also to other structures like leaves or flowers

  4. Parts of theStem(juls) • The stem is normally divided into nodes and internodes. • Main stem: the most important one in the plant • Secondary stem: grow from the main stem • The nodes: hold buds which grow into one or more leaves, flowers, cones or other stems etc. • The internodes: distance one node from another. • Buds: are the responsible for plant growth; either new stems, flowers or leaves. • - parts of the buds • Main terminal bud: is in charged of the upwards growing of the plant • Secondary terminal bud: come out from the tip of secondary stems, they make the secondary stem grow • Lateral buds: are placed on the stem nodes, leaves and flowers arise from it

  5. Functions(moo) • Stems have four main functions which are: • Support for and the elevation of leaves, flowers and fruits. The stems keep the leaves in the light and provide a place for the plant to keep its flowers and fruits. • Transport of fluids between the roots and the shoots in the xylem and phloem. • Storage of nutrients. • The production of new living tissue. The normal life span of plant cells is one to three years. Stems have cells called meristems that annually generate new living tissue. • xylem is one of the two types of transport tissue, phloem being the other

  6. Types of stems(tete) Herbaceusstems • Annualplants: plantwith a yearlife-time. Weedsgenerallybelongtothisgroup. • Vivaciousplants: plantswithaerialstemslasting a single season, butkeepingundergroundstructuresfromwich new stemsspringagainnextseason. Ligneousstems • Trees: in this case wecallthestemstrunks. • Shrubs: theygrowfromonetofivemeterstall and theirbranchingbegins at soillevel • Bushes: theygrowshorterthanone meter tall.

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