Tyloses block the lumen of

Options :
  1. sieve cells
  2. xylem vessels / tracheids
  3. sieve tubes
  4. xylem parenchyma
Answer and Explanation :-

Answer: Option 2

Explanation:

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I took several long walks in the Wright and adjacent Taylor Valleys. I did not feel insignificant on these journeys, dwarfed or shrugged off by the land, but superfluous. It is a difficult landscape to enter, and to develop a rapport with. It is not inimical or hostile, but indifferent, utterly remote, even as you stand in it. The light itself is aloof.
-Barry Lopez About This Life