A long tree has several branches. The tissue that helps in the sideways conduction of water in the branches is (a) collenchyma (b) xylem parenchyma (c) parenchyma (d) xylem vessels

b) Xylem parenchyma

Xylem parenchyma is an element of complex tissue called “Xylem”. Parenchyma cells of the xylem are mainly involved in the storage of carbohydrates, fats and water conduction.

  • Only living cells of xylem
  • The cell wall is cellulosic and thin
  • They have a prominent nucleus and protoplast
  • Cells are colourless and have large vacuoles
  • Living parenchyma cells are found in both primary and secondary xylem
  • Fat and storage protein contents of parenchyma cells vary seasonally
  • Crystal containing parenchyma cells have lignified walls with secondary thickening may be subdivided by septa

There are two major types of parenchyma cells in the secondary xylem

  • Axial parenchyma cells arranged around the axis
  • Radial parenchyma cells arranged like a ray, radiating out of the common centre

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