To solve this problem, we need to understand the function of tassels in the corn cob.$\newline$Tassels are the male part of the corn plant, which produce pollen.$\newline \bullet$The primary function of tassels is to release pollen grains.$\newline \bullet$These pollen grains are then carried by the wind to the female part of the plant, the silks, for fertilization.$\newline$Now, let's analyze the options:$\newline \bullet$Option 1: To attract insects - Tassels do not primarily attract insects; they release pollen.$\newline \bullet$Option 2: To trap pollen grains - Tassels do not trap pollen grains; they release them.$\newline \bullet$Option 3: To disperse pollen grains - This is the correct function of tassels.$\newline \bullet$Option 4: To protect seeds - Tassels do not protect seeds; they are involved in pollen release.$\newline$Therefore, the correct option is Option 3: To disperse pollen grains.