Discussion
Parenchyma cells associated with sieve tube members are called
Answer: B
They are called Companion cells.
In angiosperm phloem, each sieve tube member is linked by many plasmodesmata to one or more companion cells, which arise from the same mother cell. The sieve tube member loses its nucleus and most organelles at maturity, and the nucleated, metabolically active companion cell keeps it alive and loads sugars into it.
Albuminous (Strasburger) cells play the equivalent role for the sieve cells of gymnosperms, not sieve tube members. Bulliform cells are large epidermal cells in grass leaves that make the leaf roll in drought, and subsidiary cells surround the guard cells of stomata.
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