The girth associated with production of wood and bark in trees occurs as a consequence of increases are c) secondary growth.
There are many vascular flowers, secondary increase is the end result of the pastime of the 2 lateral meristems, the cork cambium and vascular cambium. Arising from lateral meristems, secondary increase will increase the girth of the plant root or stem, as opposed to its length. So, an appropriate solution is 'Lateral meristem'.
Secondary increase is characterised via way of means of an boom in thickness or girth of the plant. It is due to mobileular department withinside the lateral meristem. Herbaceous flowers frequently go through number one increase, with little secondary increase or boom in thickness.
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