Statement A: Cells of an organism not only differ in shape and size but also in their activities.

Statement B: A tracheid is a dead cell involved in conduction but a mesophyll cell is branched and involved in photosynthesis. 

• A

  Statement A is correct and B is incorrect

• B

  Both statements A  and B are correct

• C

  Both statements A  and B are incorrect

• D

  Statement A is incorrect and B is correct