1. The anomalous stem structure of Chenopodium album is produced by a periodically active cambium which forms xylem centripetally throughout its extent and phloem centrifugally in restricted regions.

Save guides, add subjects and pick up where you left off with your BBC account. Phloem consists of living cells. The cells that make up the phloem are adapted to their function: ...

If the term “phloem” sounds familiar to you ... and as such likely have a defined structure which supports that job, they would be expected to have a different compound profile to the regular ...