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Description
Flashcards by Charlotte Willis, updated more than 1 year ago
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Created by Charlotte Willis
almost 7 years ago
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| Question | Answer |
| Role of Water in Biology | Found in all living organisms = cytoplasm (all organisms), Xylem (plants), tissue fluid and blood (animals) |
| Properties of Water | -Molecules are dipolar -Hydrogen is slightly +ve and Oxygen slightly -ve - ∴ H₂O molecules can form hydrogen bonds with each other (attracted to each other) |
| Role of Water in Living Organisms | Habitat, Solvent, Hydrostatic pressure, Homeostasis |
| Explain the role of Habitat in living organisms | Habitat - Water has high specific heat capacity (lots of heat needed before evaporates, due to the presence of hydrogen bonds between water molecules) -When water freezes it is less dense and floats Insulates the water beneath preventing it from freezing -Both cases the water remains a liquid state and provide a habitat for organisms |
| Explain the role of Solvent as a property of water which useful for living organisms | Solvent as H₂O molecules are dipolar they can separate out solutes based on their charge. -+ve hydrogen side mixes with -ve solute (and vice versa) -This is useful in cytoplasm of all cells and supports the reaction of these solutes, it is also useful in the process of diffusion/active transport -useful in the transport such as blood and phloem |
| Explain in full detail the role of water for Hydrostatic Pressure and Homeostasis | Hydrostatic Pressure -When pressurised can provide a strong physical pushing force -Used in Mass Flow (where water carries a large amount of substances e.g tissue fluid in capillaries) -Help to support turgidity in Plants Homeostasis -Mammals and Humans control body temp by sweating. -Sweat on the skin when evaporates uses heat and cools the individual -As sweat/water made up of hydrogen bonds has a stable structure, requires a large amount o heat for it to evaporate -Laten Heat of Vaporisaton |
| What are inorganic ions> | -Salts/minerals Inorganic - don't contain Carbon Ion - +ve or -ve charged |
| Examples of Inorganic Ions | Sodium (Na+), Chloride (Cl-), Iron (Fe ²⁺) |
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