The Journey of water in a Plant

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The Journey of water in a Plant

  1. 1. Sana Amin 8B
  2. 2. We already know that plants need water to be able to conduct the process of photosynthesis but what we don’t know is how the water travels within the plant.
  3. 3. First of all we need to know how the water gets into the soil. This is an easy one – Rain. When it rains, the water gets soaked up by the soil. Plants can also absorb water that has built up from rain water or ground water.
  4. 4. Absorbing the water The roots of plant do not actually reach down into the soil to find water reserves, and plants don't sip water through roots like straws. Instead, the hundreds of hairs that extend from the tip of every root absorb water from the soil. The roots themselves mainly serve to anchor the plant firmly in place and channel the water upward. Even in seemingly dry soil, a thin film of water surrounds every microscopic soil particle. As the roots grow, the hairs, which are actually single cells, stretch out and absorb the film. The water diffuses through the cell walls, and gets drawn up into the roots.
  5. 5. The root’s other job The cortex of the root is divided up by sheets of cells called vascular rays, which carry water laterally to the center of the root which is the called the stele. Inside the stele are veins that serve as the circulatory system of the plant. Here is where the water begins its journey upward and into the plant.
  6. 6. Transportation The vein that conducts water from the stele is called the xylem. The xylem extends to every part of the plant. It is made up of columns of dead reinforced cells that move the water and mineral from the roots through the stem to the leaves. Xylem cells make a tube from the leaf, down the stem to the roots. In the root it has to resist forces that could pull the plant out of the ground. In the stem it has to resist compression and bending forces caused by the weight of the plant and the wind.
  7. 7. Transpiration Transpiration explains how water moves up the plant against gravity in tubes made of dead xylem cells without the use of a pump. The water that a plant uses serves several functions. In addition to hydrating and nourishing the plant, it also regulates the plant's temperature. This is called transpiration. The warmth of the sun causes the water on the surface of spongy and palisade cells (inside the leaf) to evaporate and then diffuse out of the leave. As the plant becomes warm, more water is drawn out of the xylem cells making a continuous tube from the leaf, down the stem to the roots.
  8. 8. Xylem & Phloem The xylem and phloem are located side-by-side in plants; the xylem is near the outside of the plant structure, while the phloem is closer to the inside. They basically make up the vascular system of the plant. I have already talked about xylem so here is what phloem does. During the process of photosynthesis, the water dissolves the glucose (sugar) made in the leaves. This sugar-water is carried from the leaves back down the plant toward the roots through another vein, called the phloem. It feeds every part of the plant as it travels downwards.
  9. 9. Bibliography 1 - "BBC - GCSE Bitesize: Transpiration." BBC - Homepage. Web. 10 Mar. 2011. <http://www.bbc.co.uk/schools/gcsebitesize/science/add_gateway/greenworld/plantt ransportrev2.shtml>. 2 – "How Is Water Transported From the Roots Throughout Plants? | Garden Guides." Garden Guides, Your Guide to Everything Gardening. Web. 10 Mar. 2011. <http://www.gardenguides.com/77110-water-transported-roots-throughout- plants.html> 3 - Martinez, Jessica. "How Is Water Transported From the Roots Throughout Plants? | EHow.com." EHow | How To Do Just About Everything! | How To Videos & Articles | EHow.com. Web. 10 Mar. 2011. <http://www.ehow.com/how- does_5415700_water-transported-roots-throughout-plants.html>.

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