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Plant Water Relation — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYPlant Water Relation4 Marks
Question
Apoplast pathway.
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Answer

  1. The movement of water across the root cells occur by two pathways viz. apoplast and symplast.
  2. Apoplast movement of water in plants occurs exclusively through cell walls and intercellular spaces in living cells of cortex.
  3. Apoplast pathway is up to the endodermis as the suberized layer of Casparian strip obstructs the movement.
  4. Additional apoplastic route giving direct contact to xylem and phloem is through secondary roots which originate at pericycle and bypass endodermis.
  5. The cellulosic walls of root hair, cortical cells are hydrophilic and permeable to water.

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