Which characters for secondary growth are incorrect from given characters?

(i) The cells of cambium cut off towards pith, mature into secondary phloem and the cells cut off towards periphery mature into secondary xylem.

(ii) The vascular cambium is generally more active on the outer side than on the inner.

(iii) The primary and secondary phloems get gradually crushed due to the continued formation and accumulation of secondary xylem.

(iv) The primary xylem however remains more or less intact, in or around the centre.

(v) At some places, the cambium forms a narrow band of parenchyma, in the radial direction called secondary medullary rays.