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BIOL10103 - BIOL10103 WATER AND THE FITNESS OF THE...

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1 BIOL10103 WATER AND THE FITNESS OF THE ENVIRONMENT
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2 I. Essential for life A. Search for water on other planets B. Life began in water and evolved for 3 billion years before moving to land C. 70% water D. in all forms on earth 1. solid – as ice on polar caps 2. liquid 3. gas- water vapor E. life adapts to environment by natural selection but environment must be suitable to sustain life II. properties of water A. bonds 1. polar covalent a) + and - charges 2. Hydrogen bonds with electrical attractions B. Cohesion 1. due to which type bonds?______________ 2. water molecules stick to each other 3. continually form, break, reform rapidly 4. 4 per molecule 5. makes water higher structural level
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3 6. example of importance: water evaporates from leaves of plant and moves up from roots against gravity a) adhesion helps this movement (1) Adhesion is: 7. also gives a) surface tension (1) how difficult to break surface (2) allows stone to skip on water (3) insects to walk/land on water surface (4) see when glass if filled over rim of glass (5) beads up when spilled on surface
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