Transport - 1 Transport Plants vs animals PLANTS As you probably remember from other courses plants are composed of three basic parts roots stems and

Transport - 1 Transport Plants vs animals PLANTS As you...

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Transport - Plants vs. animals PLANTS As you probably remember from other courses, plants are composed of three basic parts: roots, stems, and leaves. Roots - provide anchorage and absorb water and nutrients from the soil. The roots contain small hair-like structures, which increase the root’s surface area and as a result nutrient absorption. Stems - the stems of a plant provide support and contain some chloroplasts used in photosynthesis. Leaves - Most of the photosynthesis process occurs in the leaves. A good analogy for leaves that can be used with elementary school students is that leaves are like “food factories” for the plant. The leaves are covered by a waxy cuticle, which prevents water loss from the plant. Although most gases can-not cross the cuticle, oxygen and carbon dioxide diffuse across the leaves’ undersurface through very small pores called stomata. Plants also lose water through the stomata during transpiration. Thus, plants need some type of system for the following purposes: 1. To move water and nutrients from the soil to the leaves. 2. To transport to different parts of the plant the sugars produced in the leaves during photosynthesis. This system is called vascular system and is composed of narrow tubes that extend throughout the body of the plant. The veins that are visible in the leaves of every plant are part of this system. The vascular system is composed mainly of two tissues - xylem and phloem. Xylem - is composed of dead cells that form microscopic pipes that transport water and minerals from the roots up throughout the plant. Phloem - is composed of living cells that distribute the sugars produced in the leaves throughout the plant. Check the following website for a concept map on the transport system in plants l We should also not forget that trees, which are called woody plants, because they produce wood, have other components: 1
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  • Winter '13
  • DavidGrueber
  • right ventricle, left ventricle, inferior vena cava, right atrium, oxygen rich blood

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