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Plant Water Relation — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYPlant Water Relation3 Marks
Question
Discuss theories of water translocation.
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Answer

  1. Translocation of water is transport of water along with dissolved minerals from roots to aerial parts.
  2. The movement is against the gravity and described as ascent of sap.
  3. The translocation occurs through lumen of water conducting tissue xylem mainly vessels and tracheids.
  4. Different theories have been discussed for translocation mechanism like vital force theory (Root pressure), relay pump, physical force (capillary), etc.
  5. Cohesion tension theory or transpiration pull theory is most widely accepted theory.

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