BIOL 302 Chapter Notes - Chapter 3: Osmotic Pressure, Water Potential, Permanent Wilting Point

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25 Sep 2016
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Nutrients and water is obtained from the soil for most terrestrial plants. Photosynthesis: sunlight provides the energy for this process: adaptations to terrestrial environments poses challenges for the balance of water, salt, and nitrogen, adaptations to different temperatures allow for terrestrial life to exist all around the planet. Carbohydrates used to fuel survival and growth for plants: oxygen, carbon, and hydrogen to create carbohydrates. Involved in making proteins, nucleic acids, and other essential organic compounds. Ions dissolved in water can provide other nutrients: held in soil. Lack of nitrogen tends to result in the limitation of plant production in terrestrial environments. Water potential: measure of water"s potential energy: factors affecting potential: Matric potential: potential energy generated by attractive forces between water molecules and soil particles. Value becomes more negative with water scarcity. Also known as matrix potential: water and soil molecules are electrically charged, causes attraction, explains why water retention is possible in soil regardless of gravities role.

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