Assertion (A): The cell walls of meristems are thin, cellulosic with plasmodesmata connections
Reason (R): Meristems obtain biomolecules necessary for metabolism through plasmodesmata
Both A& R are true and R explains A
Meristematic cells are small with thin primary cellulosic cell wall and with no reserve food materials but these cells are metabolically very active. They obtain biomolecules through plasmodesmata from the storage organs. Plasmodesmata are the small opening of cytoplasm through the cell walls of adjacent plant cells to communicate and transport materials.