Biology 9700 · AS & A Level · Movement into and out of cells

Movement into and out of cells — practice question

What is the primary role of a companion cell in mature 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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