Biology 9700 · AS & A Level · Structure of transport tissues

Structure of transport tissues — practice question

What is the chief role of a companion cell in phloem tissue?

  • Aproviding cytoplasmic contact with the sieve tube element for loading
  • Bproviding structural support for the sieve tube element
  • Cproviding the nucleus for cell division in the phloem
  • Dproviding the source of assimilates for storage

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