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What purpose is served by the pits and pores in xylem and phloem cells? I cant find what purpose that these components serve in the vascular tissues in plants

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    $\begingroup$ Welcome to Biology S.E.! If you need additional assistance with the site, please visit The Help Center. $\endgroup$ – L.B. May 17 '15 at 22:59
  • $\begingroup$ Welcome! Could you provide a reference to where you have encountered these features? A picture might help too. Good luck. $\endgroup$ – AliceD May 18 '15 at 10:06
  • $\begingroup$ those are on side walls of xylem? they allow side-wise flow of water. In cases a bubble blocks a xylem, through side-pits the water bypass. In many plants there are a sort of torus-margo structure that blocks the water-flow if side-flow crosses a limit. $\endgroup$ – Always Confused Sep 9 '16 at 11:46
  • $\begingroup$ In case of phloem, if the sieve tubes (which are metabolic-active and full of cytosol) did not contained pores in their tops and bottoms (sieve plates), it would have problem in transport, as-well, through fine pores in sieve plate there are cytoskeletal structures those possibly have some active role in transport. The sieve pores sometimes blocked by callose and P-protein, especially to resist stress like cut and bleed, and also in certain stages of dormancy. $\endgroup$ – Always Confused Sep 9 '16 at 12:00
  • $\begingroup$ Xylem vessels are wide and 'dead' (empty, without any cytosol), to avoid the friction to drag water. $\endgroup$ – Always Confused Sep 9 '16 at 12:03

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