Summary: As Level Biology For Ocr: Student Book | 9781847627896 | CGP Books, et al
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Read the summary and the most important questions on AS Level Biology for OCR: Student Book | 9781847627896 | CGP Books; Richard Parsons
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2.2.1 Water
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Why is it important that water is a solvent?
Many biological reactions take place in solution. -
Why is water good for transporting substances?
It is a liquid and a solvent. -
How does water help with temperature control?
It has a high specific heat capacity and a high latent heat of evaporation. -
Why is water a habitat?
Many organisms can survive and reproduce in it. -
Describe the structure of a water molecule.
One atom of oxygen joined to two atoms of hydrogen by shared electrons (a covalent bond). -
Why doesn't water experience rapid temperature changes?
It has a high specific heat capacity - it takes a lot of energy to heat up. -
Why is it good for humans that water has a high latent heat of evaporation?
It makes it good for cooling surfaces (e.g. when we sweat, it evaporated causing the surface of the skin to cool). -
Why does being cohesive make water a good transport substance?
It helps the water to flow. -
Why is ice less dense than water?
Molecules are held further apart in ice, making a lattice shape. -
Why is having a low density useful?
In cold temperatures, ice stays on top, insulating the water underneath. Therefore, organisms can still move around.
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