B

Merits

      1.  It is very simple way of classification

      2.  It is the most pioneer work in plant classification

Demerits

     1. Linnaeus system of classification is purely an artificial one where    

     he tried to arrange  the genera into orders with characters of

     simple symmetry.

    2. Most of the orders and genera of some families are mixed up, e.g., 

      some members of Anacardiaceae and all members of

    Zingiberaceae have been placed in one class Monandria as they

    have only one stamen.

   3. Dicots and monocots were mixed up in some cases, e.g.

   Sarmantaceae includes both Citis (dicot) and Asparagus (monocot).

  4 . Polypetalous orders are mixed up with gamopetalous ones.