BIOLOGY 1B Study Guide - Final Guide: Casparian Strip, Sieve Tube Element, Water Potential
6 Apr 2016
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Water potential gradient moves from a higher to lower concentration: from soil. Cells are vessels and tracheids all are dead. Vessels: wider, have plates between: phloem: Sources (leaves, storage root, and stem) to sinks (roots/anything nonphotosynthetic that has respiration) Cells: sieve tubes, companion cells all are alive. Symplastic and apoplastic route: symplastic: crosses plasma membrane right at the root hair, crosses through casparian strip, apoplastic: flows between cell walls, eventually crosses through a plasma membrane to reach the xylem. Water potential: additional solutes will make water potential move toward a lower (negative) value water will always move from a higher potential to a lower potential! (toward where there are more solutes) Aggregate: (raspberries) comes from many carpels in a single flower. Multiple: (pineapple) carpels from many flowers that are fused together: simple. Fleshy: derived from ovary (peach) or receptacle tissue (apple) Dry: splits (beans) or doesn"t split (nuts)
