Biology Forums - Study Force

Xylem
  a. involves mainly the shoot system.
  b. includes lignin-reinforced cell walls.
  c. involves the roots.
  d. involve stomata.
  e. includes pipelines that conduct water from soil
  to leaves.

Question 2

__________ are small gaps across a leafs epidermis
  that help regulate water and gas levels in the plant.
  a. Palisade cells
  b. Mesophyll
  c. Roots
  d. Stomata
  e. All of these

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