companion cells is present in angiosperms, gymnosperm, pteridophytes, bryophyte
Answers
Explanation:
angiosperms are sieve tubes and companion cells found in the phloem (see angiosperm: Vascular tissue). In other vascular plants, parenchyma cells function in the same way as companion cells (that is, as the sieve cell's living protoplasm), but they are not derived from the same mother cell as the sieve…
In Pteridophyta and gymnosperms, cells that are found in place of companion cells are albuminous cells.
Companion cells and sieve tubes are absent in pteridophytes. ... Gametophyte of pteridophytes require cool, dry and shady places to grow.
They are specialised parenchymatous cells, which are closely associated with sieve tube elements. They help in maintaining the pressure gradient in the sieve tubes. They are absent in pteridophytes and gymnosperms. Thallophytes and bryophytes do not contain vascular bundles (i.e. xylem and phloem).