28. Describe 4 properties which render water to
be an important medium for life. [8]
Answer:
A) # Solvent
-water is a polar/ dipolar/
charged molecules
-solubilize most of biological
molecules/ medium for biological reaction/ ionic solids/ nutrient substances.
-due to the hydrogen bonding.
# High heat capacity/high latent heat of
vaporization.
-good in maintaining against
temperature fluctuation/ stabilize temperature.
-high boiling point.
-Vaporization leads to the
cooling effect.
# High surface tension
-formation of plasma membrane/
micelle.
-cohesion and adhesion forces
for movement of water up a capillary.
# maximum density of water at 4ºC/ ice float
on water.
-water increases in volume and
reduces in density as temperature drops
-this ensure aquatic organism
to survive in freezing water/ ice is a insulator of heat.
# low viscosity
-acts as lubricant/ low resistant for
movement.
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