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BIOL 1902 (382)
Lecture

wk 6.doc

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Department
Biology
Course
BIOL 1902
Professor
Michael Runtz
Semester
Summer

Description
LECTURE NOTES FOR WEEK SIX ONE LECTURE ONLYPLANTS ALSO FACE PROBLEMS IN SUBZERO TEMPERATURESDEEP SNOW PROBLEMPHYSICAL DAMAGE DUE TO WEIGHT OF THE SNOWSOLUTIONS 1LOSS OF LEAVES DECIDUOUS TREES2HAVE SMALL LEAVES CONIFER NEEDLESSHAPE THAT SHEDS SNOW3HAVE A SPIRE SHAPE BALSAM FIR OR SPINDLY SHAPE SPRUCEPLANT LEAVES POSE ANOTHER PROBLEM IN WINTERDESSICATION DRYING OUTSOLUTIONS1 HAVE THE LEAVES FALL OFF ALL DECIDUOUS TREES AND LARCH OR TAMARACK2 LEAVES STAY ON BUT HAVE ADAPTATIONS SUCH AS SMALL SURFACE AREATHEN THERE IS THE PROBLEM OF HAVING THE WATER INSIDE THE PLANT TISSUES FREEZE SOLUTIONS NOTEPLANTS DO NOT PRODUCE ANTIFREEZE PLANTS CAN BE COLD HARDYFREEZE TOLERANTPLANTS HAVE ICE BETWEEN CELLS BUT NOT INSIDE THEMTHE ICE PENETRATES THE CELL WALLS BUT NOT THE CELL MEMBRANE MEMBRANES BECOME MORE ELASTIC AND ALLOWS WATER TO LEAVE CELLS MAKING THE SOLUTE INSIDE THE CELLS MORE CONCENTRATEDTHIS ALLOWS THE LIQUID INSIDE THE CELL TO S
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