Question: where does primary growth occur and when during a plants development

title: Plant development
text: Once the embryo germinates from its seed or parent plant , it begins to produce additional organs ( leaves , stems , and roots ) through the process of organogenesis . New roots grow from root meristems located at the tip of the root , and new stems and leaves grow from shoot meristems located at the tip of the shoot . Branching occurs when small clumps of cells left behind by the meristem , and which have not yet undergone cellular differentiation to form a specialized tissue , begin to grow as the tip of a new root or shoot . Growth from any such meristem at the tip of a root or shoot is termed primary growth and results in the lengthening of that root or shoot . Secondary growth results in widening of a root or shoot from divisions of cells in a cambium . 

Answer: answer: Once the embryo germinates from its seed or parent plant , it begins to produce leaves, stems and roots. New roots grow from root meristems located at the tip of the root. Growth from any such meristem at the tip of a root or shoot is termed primary growth.