Both phloem sieve tube cells and xylem vessel cells are derived from same kind of precursor cells but at maturity they are different. What feature is unique to phloem sieve tube cells?
Both phloem sieve tube cells and xylem vessel cells are derived from same kind of precursor cells but at maturity they are different. What feature is unique to phloem sieve tube cells?
The correct option is A The cell membrane remains intact in a mature functioning cell.
Xylem vessels are a long straight chain made of tough long dead cells known as vessel elements or vessel members. The vessel cells are devoid of protoplasm. The cells are arranged end to end and the cell walls have disappeared. This makes a tube. Sieve cells are long, slender, conducting cells of the pholem that do not form a constituent element of a sieve tube, but which are provided with relatively unspecialized sieve areas, especially in the tapering ends of the cells that overlap those of other sieve cells.
The cell membrane remains intact in a mature functioning cell.
Xylem vessels are a long straight chain made of tough long dead cells known as vessel elements or vessel members. The vessel cells are devoid of protoplasm. The cells are arranged end to end and the cell walls have disappeared. This makes a tube. Sieve cells are long, slender, conducting cells of the pholem that do not form a constituent element of a sieve tube, but which are provided with relatively unspecialized sieve areas, especially in the tapering ends of the cells that overlap those of other sieve cells.
