The answer is organic farming.
Deciduous trees are trees that drop their leaves for part of the year. They are found in temperate and tropical climates all over the world. Deciduous trees have broad flat leaves that catch a lot of light and require a great amount of water.
Lets say the plant that formed nodules is Species A, and the one who didn't is Species B.
If the nitrogen is concentrated in one area but at a low concentration, then Species A may have formed nodules because it is closer to the concentrated nitrogen. Species B didn't because the nitrogen that is active is being taken by Species A.
Because cell is composed of organelle and several little material which haven't an ability to increase in size just in same manner as a rubber therefore cell divide for increase their number .
i hope this is helpful
