(i) Study of the internal structure of plants is anatomy and internal structures also show adaptations to diverse environments. 
(ii) Apical meristem occurs in grasses, and it can regenerate parts removed by grazing herbivores.
(iii) Xylem fibres have highly thickened walls and obliterated central lumen.
(iv) Phloem parenchyma is made up of elongated tapering cylindrical cells with dense cytoplasm and nucleus.
Select the correct statements.