Companion cells of phloem are found in A)Gymnosperms B)Bryophyta C)Pteridophyta D)Angiosperms
Option D) Only in angiosperms are sieve tubes and companion cells found in the phloem. 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 element.
