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Question
When pollen grains in water are viewed under a microscope they are seen to be constantly moving. This movement is called _____.
When pollen grains in water are viewed under a microscope they are seen to be constantly moving. This movement is called _____.
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Solution
The correct option is D Brownian motion
Water is made up of tiny particles which are moving very fast. (The water particles or water molecules themselves are invisible under the microscope because they are very, very small) The pollen grains move on the surface of water because they are constantly being hit by the fast-moving particles of water. So, though the water particles (water molecules) are too small to be seen, their effect on the pollen grains can be seen clearly. The random motion of visible particles (pollen grains) caused by the much smaller invisible particles of water is an example of Brownian motion.
Water is made up of tiny particles which are moving very fast. (The water particles or water molecules themselves are invisible under the microscope because they are very, very small) The pollen grains move on the surface of water because they are constantly being hit by the fast-moving particles of water. So, though the water particles (water molecules) are too small to be seen, their effect on the pollen grains can be seen clearly. The random motion of visible particles (pollen grains) caused by the much smaller invisible particles of water is an example of Brownian motion.
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