BotanyStatement A: Xylem transport is mainly driven by maintaining negative pressure potential at the surface of mesophyll cell walls and relatively more pressure potential in the root. Statement B: Phloem transport is driven by maintaining more pressure potential at the source and less pressure potential at the sink.

Statement A: Xylem transport is mainly driven by maintaining negative pressure potential at the surface of mesophyll cell walls and relatively more pressure potential in the root. 

Statement B: Phloem transport is driven by maintaining more pressure potential at the source and less pressure potential at the sink.

  1. A

    Both statements A and B are incorrect

  2. B

    Statement A is correct and B is incorrect

  3. C

    Both statements A and B are correct

  4. D

    Statement A is incorrect and B is correct

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    Solution:

    Xylem transport or ascent of sap is driven by development of negative pressure potential or tension at the surface of mesophyll cell wall which is transmitted along the xylem and ultimately to root. The phloem transport is driven by more pressure developed in sieve tubes at the source and less pressure in the sieve tubes of sink. 

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