Question:

Which one of the pathways of water movement involves cell wall and intercellular spaces ?

Updated On: Jun 21, 2022
  • Vacuolar pathway
  • Protoplast pathway
  • Symplast pathway
  • Apoplast pathway
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The Correct Option is D

Solution and Explanation

The concept of apoplast and symplast was introduced by Munch in 1930. In apopiast pathway, "water passes . from root hairs to xylem through the walls of intervening cells, without crossing any membrane or cytoplasm. It provides the least resistance to movement of water. It is interrupted by the preserice of impermeable lignosube1in Casparian strips in the walls of endodermal cells. In symplast pathway, water passess from cell to cell through their protoplasm facing plasmalemma (cell membrane), at least at one place. It is also called transmembrane pathway. It does not enter cell vacuoles. The cytoplasm of the adjacent cells are connected through bridges called plasmodesmata. Symplastic movement is aided by cytoplasmlc streaming of individual cells. It is, however, slower than apoplastic movements.
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Concepts Used:

Transport in Plants

The two types of conducting tissues that are used to transport the water and minerals in plants such as:

Xylem:

Xylem is a long, non-living tube running from the roots to the leaves via the stem. The water is absorbed by the root hair and goes through cell-to-cell movement by osmosis until it reaches the xylem. This water is then transported throughout the xylem vessels to the leaves and is evaporated by the process of transpiration.

The xylem is also composed of lengthened cells like the phloem. However, the xylem is mainly accountable for transporting water to all plant parts from the roots. Since they serve such a vital function, a single tree would have a lot of xylem tissues.

Phloem:

The phloem is accountable for the translocation of nutrients and sugar like carbohydrates, produced by the leaves to areas of the plant that are metabolically in force. It is powered by living cells. The cell walls of these cells structurize small holes at the ends of the cells known as sieve plates.

Means of Transportation in Plants:

Transportation in plants is by 3 means, they are as follows:

  • Diffusion
  • Facilitated diffusion
  • Active Transport