When pollen grains are suspended in water and viewed through a microscope, they appear to be in a state of constant but erratic motion. This is due to?
convection currents
small changes
small changes in temperature
a chemical reaction between the pollen grain and water
the bombardment of the pollen grains by molecules of water
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The erratic motion of pollen grains when suspended in water and viewed through a microscope is due to a phenomenon known as Brownian motion. Brownian motion is caused by the random collisions of molecules in the surrounding medium (in this case, water) with the pollen grains.
So, the correct answer is:
E. the bombardment of the pollen grains by molecules of water
Brownian motion is simply the continual random motion of the molecules of a liquid. Then when pollen grains suspended on water are observed through a microscope, they are seen to move in a haphazard (or random) manner. "This is because they are bombarded by water molecules, which are in a constant random motion"
