Select the incorrect option.
Primary growth is the increase in girth of axis due to activity of apical meristem.
Secondary growth is due to the activity of lateral meristems.
Elongation of stem is the primary growth.
Increase in surface area of leaf is the primary growth.
Increase in the girth of root and stem is secondary growth which is due to the activity of lateral meristems (vascular cambium and cork cambium).