Answer:
D. meristem
Explanation:
Meristematic tissue is responsible for the growth of the plant in a longitudinal and diametral direction; Their cells are characterized by being small in size, with polyhedral shape, thin walls and small and abundant vacuoles; It has the capacity to divide and from there it is that the rest of the tissues are produced, a phenomenon that allows the differentiation of vegetables with animals that reached multicellularity in a totally different way, in addition they only grow until the fourth age in the meantime plants due to meristems grow throughout their lives. That is to say, the meristematic tissues are constituted by a series of cells with thin primary walls with a large nucleus and dense cytoplasm, so that these tissues allow the tree to grow diametrically and longitudinally. The primary or longitudinal growth of the plants originates thanks to apical meristem and diametral growth, that is, in terms of thickness or secondary growth, it is given by divisions that are manifested in the vascular cambium and, to a lesser extent, in the cortical cambium .
