How does leaves of plants help

Question:

How does leaves of plants help in excretion ? (CCE 2016)

Solution:

Waste materials produced in plant cells are stored ’in their vacuoles. In leaves, the waste materials are

  1. Stored in vacuoles of mesophyll and epidermal cells,
  2. Oxalic acid is crystallised as calcium oxalate.
  3.  Nitrogenous wastes are changed into alkaloids
  4. Vaste aromatic compounds are changed into tannins. As the old leaves fall, the waste materials are also removed from the plant.

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