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Mushroom-autotroph Human-heterotroph Grass-heterotroph Fish-autotroph

Based on the method by which they get food, organisms are classified as autotrophs or heterotrophs. Which organism listed below is correctly paired with its metabolism?. Mushroom-autotroph Human-heterotroph Grass-heterotroph Fish-autotroph. CPS.

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Mushroom-autotroph Human-heterotroph Grass-heterotroph Fish-autotroph

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  1. Based on the method by which they get food, organisms are classified as autotrophs or heterotrophs. Which organism listed below is correctly paired with its metabolism? • Mushroom-autotroph • Human-heterotroph • Grass-heterotroph • Fish-autotroph CPS

  2. Orchids were studied to determine ifdifferent amounts of humidity affected the flowering of these plants. Which ofthese was the independent variable in this study? A The percentage of humidity B The amount watered C The length of time required for flowering D The number of flowers on each plant CPS

  3. An experiment was designed to determine the effects of cool temperatures on the germination of piñon pine seeds. Which of these variables was LEAST important to control in this experiment?  A The brand name of the refrigerator used to produce the cool temperatures B The number of seeds used in each group C The amount of time that the seeds were exposed to cool temperatures D The temperature range used to define cool temperatures CPS

  4. PROPERTIES OF WATER http://www.youtube.com/watch?v=wOOY1szbcX4&feature=related

  5. WATER • The most abundant compound in living things. • Universal solvent • Expands as it freezes. • Ice is less dense than liquid water so it floats in water. Think about importance- polar bears

  6. Other Useful Info on Water • The 2 to 1 ratio of hydrogen to water remains the same, no matter what • Polar nature of water allows it to be the “universal” solvent • The low density of water in its solid state (ice) allows for organisms to survive cold water environments.

  7. What characteristic of water remains the same no matter what is dissolved in it? A. The ratio of hydrogen to oxygen B. The ability to refract light C. The hydroxide ion concentration D The freezing temperature CPS

  8. Fish survive through severe winters because of the property of water that allows water to — A. form chemical bonds as it freezes, raising the water temperature below the ice B. increase in density while it freezes, dissolving more oxygen from the air C. expand when it freezes, creating a floating and insulating layer of ice D. precipitate vital nutrients when it freezes, increasing the food supply CPS

  9. If the properties of water were to change so that the solid form was denser than the liquid form, organisms living in a cold pond environment would be less likely to survive because water would no longer — A. dissolve enough oxygen from the air B. produce solutions containing vital nutrients C. remain neutral, instead becoming highly acidic D. produce a floating insulating layer of ice CPS

  10. WATER MOLECULE • Polar Molecule – molecules with oppositely charged ends act like magnets • Look at the molecules below. **Opposites attract H+ H+ H+ H+ O- O- Results in H+ H+ H+ H+ O- O- Atracted to each other

  11. HYDROGEN ATTRACTIONS • Weak attractions between oppositely charged ends of different water molecules (H+ attracted to O-) ***Think of each water molecule being a tiny magnet that attracts other water molecules and/or other different molecules • Causes cohesion and adhesion. • NOT A “BOND”/Just an attraction

  12. COHESION vs. ADHESION • Cohesion – water molecules attracted to water molecules • i.e. water droplets – “beads up” • Adhesion – water molecules attracted to different molecules • i.e. capillary action – H2O attracted to glass or tissue (meniscus and plants) • Water droplets sticking to the side of a car window

  13. Adhesion/Capillary Action

  14. Cohesion, Adhesion or Both? • Examining the pictures, explain which water property or properties is occurring. Be Specific!!!

  15. The unique properties of water enable life to exist on Earth. Which of these is a property of pure water? • Its solid form is more dense than its liquid. • It has a low heat absorption capacity. • It is slightly more acidic than air. • It dissolves many substances. CPS

  16. Which factor makes water an effective solvent? A. The presence of molecular oxygen B. Its lack of covalent bonds C. The polar nature of its molecules D. Its abundance on Earth’s surface CPS

  17. SOLUTION • A mixture in which molecules are evenly distributed • Solute – substance being dissolved • Solvent – substance doing the dissolving. Cl- Cl- Na+ Water Water

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