When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
What could particles X be ?
(b) What do you think liquid Y is ?
(c ) What is zig-zag movement of X known as ?
(d) What is causing the zig-zag movement of particles X ?
(e) Name the scientist who discovered this phenomenon.
(f) What does this experiment tell us about the nature of liquid Y ?

Answer

(a) Pollen grains (b) Water (c ) Brownian motion (d) The fast moving water molecules are constantly hitting particles X (pollen grains) causing them to move in a zig-zag path (e) Robert Brown (f) The liquid Y is made up of extremely small particles which are constantly moving