class notes 2.26

class notes 2.26 - Bio 1006: 2/26/10 Vascular tissue: xylem...

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Bio 1006: 2/26/10 Vascular tissue: xylem and phloem Types of plant growth: o Apical bud: growth in the top most part of the plant o Root cap: tip of the root that grows down into the soil Meristematic tissues: areas of vigorous cell division, cell growth and cell elongation o Apical Meristems- provide for vertical growth of the plant, plant grows from the tips Primary bud and root tip o Lateral meristematic tissues- provide for horizontal, lateral growth or thickening Vascular cambium and cork cambian (xylem and phloem) Functions of root systems: o Anchor plants- absorb water and nutrients, transport water into plant, store food (carrots, turnips, etc.), special roots (aerial roots-orchids and other epiphytes, prop roots-look like sticks coming out of the sides of the plant to hold them up, adventitious roots- when the plant touches the ground, more roots grow out of that area) Roots have hairs that are very thin (one cell), cotton-like, help take in water and nutrients because most of the root actually has bark in it to protect the plant from diseases so the root itself can not take in water Taproot: dominant central root with many side branches. Adapted for deep penetration into soil to obtain water. Most trees, typical of most dicots Fibrous root system: many roots which are highly branched and all are relatively the same size. Scattered below the surface to soak up lots of water immediately after rain. Includes most grasses and many tropical plants. Typical of most monocots. o Like prairie grasses, where the roots are right above the soil so the water is soaked up immediately Core (inside-most part of the root): vascular steele Root bark/epidermis: protects root from diseases and from drying out Root tip: Rough layer of cells that are very hardened and woody-like (root calf), protects the root as it pushes into the soil Large cells between the vascular steele and the root bark, this is for water and food storage, called the root cortex Meridex tissue: half way down the root, between the root calf and the tip Meristem tissue: divide to make new cells in the root, area of cell division and mitosis, merostematic tissue
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class notes 2.26 - Bio 1006: 2/26/10 Vascular tissue: xylem...

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