Q.Read the following sentences and identify the correctly matched sentences.

Xylem (Gk. xylos = wood; term coined by Nageli, 1858; older synonym hadrome, Haberlandt 1914) is the complex, principal water- and mineral-conducting tissue of a vascular plant, built from four cell types working together: tracheids, vessels (trachea), xylem parenchyma and xylem fibres. Xylem laid down by the procambium of the apical meristem is primary xylem; xylem added later by the lateral vascular cambium is secondary xylem. Within primary xylem, the earliest-formed, smaller-celled elements are protoxylem, and the later-formed, larger-celled elements are metaxylem; their relative spatial arrangement is named exarch (protoxylem peripheral, metaxylem central - typical of roots), endarch (protoxylem central, metaxylem peripheral - typical of stems), centrarch (protoxylem central, one strand, surrounded by metaxylem, e.g. Selaginella) or mesarch (protoxylem central, several strands, surrounded by metaxylem, e.g. Ophioglossum). Tracheids are dead, elongated, tapering, imperforate cells with bordered pits, showing annular/spiral/reticulate/scalariform/pitted secondary-wall thickening; they are the sole water-conducting cells of gymnosperms and pteridophytes and also give mechanical support. Vessels (trachea) are wider, dead, tube-like structures formed from vessel elements joined end to end and perforated at their end walls (a single pore = simple perforation plate, e.g. Mangifera; several pores = multiple perforation plate, e.g. Liriodendron); they are the chief water-c …