question_answer 27)

  A vesselless piece of stem possessing prominent sieve tubes would belong to (a) Pinus                            (b) Eucalyptus                      (c) Grass                            (d) Trochodendron

Answer:

                  (c) Periderm Patato is a underground stem. The outer epidermal layer of the stem isknown as periderm. So when we remove skin of potato, we are actually removing the periderm.